From tmca at ctiosz.ctio.noao.edu Thu Jul 29 13:11:28 2004 From: tmca at ctiosz.ctio.noao.edu (Tim Abbott) Date: Thu, 29 Jul 2004 13:11:28 -0400 (CLT) Subject: CCD-world: CCD-world relocates, again Message-ID: Hi All, Once again, CCD-world is moving, this time down to Chile where it will be hosted from CTIO. I have migrated to a mailman installation which allows for a lot more by way of list management, not least the removal of email addresses from the archive (by converting "@" to " at ") which will make many of you happy, I'm sure. Also, NOAO's blacklist policy is a little less, uh, stringent than Copenhagen's. The list's web page is now: http://www.ctio.noao.edu/CCD-world You can customise your subsription at: http://www.ctio.noao.edu/mailman/listinfo/ccd-world Send posts to: ccd-world at ctio.noao.edu Everyone who was subscribed to the Copenhagen server is subscribed to this new one. I suggest the first thing that every subscriber should do is find out what their password is. To do this, go to the server page above, put the address with which you are subscribed to CCD-world in the last text box at the bottom of the page and click on "Unsubscribe or edit options" then follow the instructions. The Copenhagen address will continue to exist for a while, but I'll kill it soon as I'm getting sick of the junk mail. The CFHT address was turned off several months ago. There will doubtless be a shakedown period, so please bear with me. Right now, I can't make the archive handle attachments properly. Sigh. May all your detectors be blemish-free, noiseless, 100% efficient, and indestructible, Tim Abbott Moderator, CCD-world -- Tim Abbott, tabbott at noao.edu, www.ctio.noao.edu/~tmca CTIO, Casilla 603, La Serena, Chile, +56 51 205200 or NOAO/CTIO, P.O. Box 26732, Tucson, AZ 85726-6732, USA, +1 520 318 8259 ---- If you don't look hard enough, you'll see things that aren't there ---- From M.Donaghy at andor-tech.com Wed Aug 11 03:40:48 2004 From: M.Donaghy at andor-tech.com (Mark Donaghy) Date: Wed, 11 Aug 2004 08:40:48 +0100 Subject: CCD-world: low light B/W camera comparative Message-ID: <8882F227AE1F1E43B5AF03EE9816781B1ABD28@alderaan.andortech.net> Hi Sergio I saw the low light B/W camera comparative on CCD World and would love to see the Excel spreadsheet comparison. I look forward to seeing it, many thanks. Regards Mark Donaghy Marketing Manager Andor Technology discover new ways of seeing Tel. +44 28 9023 7126 Fax. +44 28 9031 0792 Web: www.andor-tech.com Andor Technology has offices in Europe, US and Japan. The registered headquarters are in Northern Ireland (Company registration number is NI 22466). Andor Technology, "discover new ways of seeing" and the Andor logo are trademarks or registered trademarks of Andor Technology Ltd. This email has been scanned for viruses. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040811/62c0d113/attachment.html From Paul.Jorden at e2v.com Fri Aug 13 07:28:28 2004 From: Paul.Jorden at e2v.com (Jorden, Paul) Date: Fri, 13 Aug 2004 12:28:28 +0100 Subject: CCD-world: change of e2v email addresses Message-ID: <4F826F960057D4118EC3009027E2453810A7F328@whl17.e2v.com> to all- our company has now acquired the use of the e2v domain. therefore please use first.last at e2v.com style for all emails to me or others here from now on. [the old name at e2vtechnologies.com style will be discontinued sometime in the future.] this does not apply to addresses of colleagues at our USA office, who use a different style. our company website address has also changed to www.e2v.com at least it saves us all some typing! Thanks, and Best Regards, Paul PS Thanks again to Tim for maintaining this list; I hope the transition to the new host system goes well. It looks good so far! _________________________________________________________ Dr Paul Jorden, CCD Sensors, e2v technologies Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK Tel: +44 (0)1245 -453458 (direct), -493493 (switchboard) Fax: +44 (0)1245 453224 (local), -492492 (central) http://ccds.e2v.com/ From Peter.fochi at e2vtechnologies-na.com Fri Aug 13 11:30:12 2004 From: Peter.fochi at e2vtechnologies-na.com (Fochi, Peter) Date: Fri, 13 Aug 2004 11:30:12 -0400 Subject: CCD-world: change of e2v email addresses Message-ID: <794729B5946AD6119C0600B0D03DD4E1E1C750@NY-EXCHANGE> Not all as of yet -----Original Message----- From: Jorden, Paul [mailto:Paul.Jorden at e2v.com] Sent: Friday, August 13, 2004 7:28 AM To: 'ccd-world' Subject: CCD-world: change of e2v email addresses to all- our company has now acquired the use of the e2v domain. therefore please use first.last at e2v.com style for all emails to me or others here from now on. [the old name at e2vtechnologies.com style will be discontinued sometime in the future.] this does not apply to addresses of colleagues at our USA office, who use a different style. our company website address has also changed to www.e2v.com at least it saves us all some typing! Thanks, and Best Regards, Paul PS Thanks again to Tim for maintaining this list; I hope the transition to the new host system goes well. It looks good so far! _________________________________________________________ Dr Paul Jorden, CCD Sensors, e2v technologies Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK Tel: +44 (0)1245 -453458 (direct), -493493 (switchboard) Fax: +44 (0)1245 453224 (local), -492492 (central) http://ccds.e2v.com/ -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From gentes at ll.mit.edu Tue Aug 17 11:45:27 2004 From: gentes at ll.mit.edu (Dave Gentes) Date: Tue, 17 Aug 2004 11:45:27 -0400 Subject: CCD-world: Lincoln Laboratory Employment opportunity Message-ID: <41222817.3030405@ll.mit.edu> Hello, I am the Recruiting Manager for MIT Lincoln Laboratory in Lexington, MA. We are seeking PhD level candidates for an opening that is focussed on leadership of ongoing research and development for CCD's and related devices. I am interested in having this position posted to users of this site and want to be sure that we adhere to your policies on this. The position descrption follows: Req RM087-60018623-1 - Job Description Lincoln Laboratory's state-of-the-art microelectronics facility supports fabrication of scientific CCD imagers, avalanche photodiode imagers, single-chip high-performance imaging/CMOS, deep-submicron digital and mixed-signal SOI-CMOS, and three-dimensionally stacked circuits, as well as MEMS-based RF switches, mirrors, and optical waveguides. Candidate will be responsible for developing silicon integrated circuit processes, with a particular focus on advanced imaging device development. Projects range from new device concept, design and implementation to construction of custom silicon imaging, mixed-signal and digital integrated circuits. * Will lead all aspects of technology realization: addressing fundamental issues in process and device trade-offs and operation, process design and fabrication, testing, and analysis of results. * Will work in a fast-paced interdisciplinary team, including close collaboration with device/circuit designers. * Ability to understand and analyze yield-limiting issues is important. * Devices are typically used in large scale demonstration systems, so ability to achieve results on schedule is also of paramount importance. Requirements: PhD in Electrical Engineering, Material Science or Physics Hands-on experience in laboratory techniques for fabricating semiconductor devices is required. Understanding of device physics and experience with computer simulation for both process development and device modeling are essential. Strong experimental, analytic, and communication skills are required. Desired Skills: * Knowledge of digital and analog circuits and material science (particularly control and characterization of electronic, mechanical, and thermal properties of silicon and its compounds) is very useful. * Computer programming experience is a plus. * Familiarity with silicon- based processing of focal plane arrays, charge-coupled devices, avalanche photodiodes, and silicon-on-insulator (SOI) CMOS circuit technology is highly desirable. Interested candidates may apply via the laboratory web site at http://www.ll.mit.edu or via via email at cosmith at ll.mit.edu. I will be happy to discuss in more detail. Thank you for your assistance. Dave Gentes Recruiting Manager MIT Linco0ln Laboratory 781-981-7068 gentes at ll.mit.edu From CMOSCCD at aol.com Tue Aug 17 17:00:47 2004 From: CMOSCCD at aol.com (CMOSCCD at aol.com) Date: Tue, 17 Aug 2004 17:00:47 EDT Subject: CCD-world: 50-50 Message-ID: <19c.281bc102.2e53cbff@aol.com> ******************jj Gang, What is the latest CCD cleaning recipe ? Any good advice for Phil ? CCD World should write a book on questions like this. Phil. . . my experience is 50 (better) 50 (worse) cleaning CCDs. It's a gamble. Is it really necessary?. . . . is the a good question to ask. As far as removing particles on the CCD. . . a long eye lash is a good way to go. Lets see what people have to say... . Jim **********************jj Subj: Cleaning CCDs? Date: 8/17/2004 12:50:31 PM Pacific Standard Time From: Phil.Dunphy at unh.edu To: CMOSCCD at aol.com CC: david.bodet at unh.edu Sent from the Internet (Details) Hi Jim, We have a couple of SITe S-018 CCDs that could use a cleaning. They have UV and vis AR coatings. Not sure what the contamination is - maybe condensation that has dried and left "spots." I looked in your book, but couldn't find any advice or warnings about cleaning CCDs. Is there a preferred solvent (methanol, isopropyl) that can be used? Can the CCD be swiped with soft, lint-free material? Do you have any experiences you can share? BTW, we will be taking x-ray transfer data with a Fe-55 source. I calculate that we can get ~ 1 event/s/pixel with a 0.8 mCi source inside the optical window. Best regards, Phil Dunphy ------------------------ Philip P. Dunphy Research Scientist Space Science Center Morse Hall University of New Hampshire Durham, NH 03824 (603) 862-2305 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040817/fa826f09/attachment.html From akana at cfht.hawaii.edu Wed Aug 18 14:26:40 2004 From: akana at cfht.hawaii.edu (akana at cfht.hawaii.edu) Date: Wed, 18 Aug 2004 08:26:40 -1000 Subject: CCD-world: Job Ad Posting Message-ID: <41239F60.3020804@cfht.hawaii.edu> Hi Tim ~ I have attached our job ad; the ad is very short and directs applicants to our website employment page vacancy notice which is much more detailed; thank you for your assistance in its posting. If you have further questions please do not hesitate to contact me. Aloha, Moani -------------- next part -------------- A non-text attachment was scrubbed... Name: Mainland_ad.pdf Type: application/pdf Size: 49508 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/ec691725/attachment.pdf -------------- next part -------------- A non-text attachment was scrubbed... Name: Mainland_ad.doc Type: application/msword Size: 24576 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/ec691725/attachment.doc From kasprzak at sbcglobal.net Wed Aug 18 15:14:00 2004 From: kasprzak at sbcglobal.net (kasprzak) Date: Wed, 18 Aug 2004 12:14:00 -0700 Subject: CCD-world: 50-50 References: <19c.281bc102.2e53cbff@aol.com> Message-ID: <00bd01c48557$852e0090$9babce3f@vince> Have you tried CO2 snow? Reticon used to use this on CCDs. Try link: http://www.cleantechcentral.com/Information/NewsAlerts/19.asp Vince Kasprzak ----- Original Message ----- From: CMOSCCD at aol.com To: ccd-world at ctio.noao.edu Cc: Phil.Dunphy at unh.edu ; david.bodet at unh.edu Sent: Tuesday, August 17, 2004 2:00 PM Subject: CCD-world: 50-50 ******************jj Gang, What is the latest CCD cleaning recipe ? Any good advice for Phil ? CCD World should write a book on questions like this. Phil. . . my experience is 50 (better) 50 (worse) cleaning CCDs. It's a gamble. Is it really necessary?. . . . is the a good question to ask. As far as removing particles on the CCD. . . a long eye lash is a good way to go. Lets see what people have to say... . Jim **********************jj Subj: Cleaning CCDs Date: 8/17/2004 12:50:31 PM Pacific Standard Time From: Phil.Dunphy at unh.edu To: CMOSCCD at aol.com CC: david.bodet at unh.edu Sent from the Internet (Details) Hi Jim, We have a couple of SITe S-018 CCDs that could use a cleaning. They have UV and vis AR coatings. Not sure what the contamination is - maybe condensation that has dried and left "spots." I looked in your book, but couldn't find any advice or warnings about cleaning CCDs. Is there a preferred solvent (methanol, isopropyl) that can be used? Can the CCD be swiped with soft, lint-free material? Do you have any experiences you can share? BTW, we will be taking x-ray transfer data with a Fe-55 source. I calculate that we can get ~ 1 event/s/pixel with a 0.8 mCi source inside the optical window. Best regards, Phil Dunphy ------------------------ Philip P. Dunphy Research Scientist Space Science Center Morse Hall University of New Hampshire Durham, NH 03824 (603) 862-2305 ------------------------------------------------------------------------------ -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/02cb5f58/attachment.html From kasprzak at sbcglobal.net Wed Aug 18 15:37:52 2004 From: kasprzak at sbcglobal.net (kasprzak) Date: Wed, 18 Aug 2004 12:37:52 -0700 Subject: CCD-world: 50-50 References: <19c.281bc102.2e53cbff@aol.com> Message-ID: <00f901c4855a$da8cd4f0$9babce3f@vince> Have you tried CO2 snow? Reticon used to use this on CCDs. Try link: http://www.cleantechcentral.com/Information/NewsAlerts/19.asp Vince Kasprzak ----- Original Message ----- From: CMOSCCD at aol.com To: ccd-world at ctio.noao.edu Cc: Phil.Dunphy at unh.edu ; david.bodet at unh.edu Sent: Tuesday, August 17, 2004 2:00 PM Subject: CCD-world: 50-50 ******************jj Gang, What is the latest CCD cleaning recipe ? Any good advice for Phil ? CCD World should write a book on questions like this. Phil. . . my experience is 50 (better) 50 (worse) cleaning CCDs. It's a gamble. Is it really necessary?. . . . is the a good question to ask. As far as removing particles on the CCD. . . a long eye lash is a good way to go. Lets see what people have to say... . Jim **********************jj Subj: Cleaning CCDs Date: 8/17/2004 12:50:31 PM Pacific Standard Time From: Phil.Dunphy at unh.edu To: CMOSCCD at aol.com CC: david.bodet at unh.edu Sent from the Internet (Details) Hi Jim, We have a couple of SITe S-018 CCDs that could use a cleaning. They have UV and vis AR coatings. Not sure what the contamination is - maybe condensation that has dried and left "spots." I looked in your book, but couldn't find any advice or warnings about cleaning CCDs. Is there a preferred solvent (methanol, isopropyl) that can be used? Can the CCD be swiped with soft, lint-free material? Do you have any experiences you can share? BTW, we will be taking x-ray transfer data with a Fe-55 source. I calculate that we can get ~ 1 event/s/pixel with a 0.8 mCi source inside the optical window. Best regards, Phil Dunphy ------------------------ Philip P. Dunphy Research Scientist Space Science Center Morse Hall University of New Hampshire Durham, NH 03824 (603) 862-2305 ------------------------------------------------------------------------------ -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/d02f01fc/attachment.html From gpobs at mindspring.com Wed Aug 18 16:41:53 2004 From: gpobs at mindspring.com (gpobs) Date: Wed, 18 Aug 2004 13:41:53 -0700 (GMT-07:00) Subject: CCD-world: 50-50 Message-ID: <17058155.1092861713864.JavaMail.root@wamui01.slb.atl.earthlink.net> An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/f1d932b7/attachment.html From rsmith at astro.caltech.edu Wed Aug 18 20:20:20 2004 From: rsmith at astro.caltech.edu (Roger Smith) Date: Wed, 18 Aug 2004 17:20:20 -0700 Subject: CCD-world: 50-50 References: <19c.281bc102.2e53cbff@aol.com> Message-ID: <4123F244.274D6F1A@astro.caltech.edu> Phil, If the contaminant is a film of material which has condensed rather than particles or crystals left behind after evaporation of a contaminant, a low risk option is to heat the detector to ~50C in vacuum to simply evaporate the film. The worst case I ran into was cryopumped vacuum grease which had moved over the course of months from a hidden overgreased O-ring on the window to the CCD over the course of months. It took days (a week?) to come off but it did go eventually. I have done this with SITe424A (2Kx2K) and SITe ST002A (2Kx4K) CCDs. 50C is conservative I think. -- Roger -------------- next part -------------- A non-text attachment was scrubbed... Name: rsmith.vcf Type: text/x-vcard Size: 456 bytes Desc: Card for Roger Smith Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/a73b6d5b/attachment.vcf From rwkadel at lbl.gov Wed Aug 18 16:32:31 2004 From: rwkadel at lbl.gov (Richard Kadel) Date: Wed, 18 Aug 2004 13:32:31 -0700 Subject: CCD-world: Cleaning CCD's Message-ID: <4123BCDF.4070706@lbl.gov> We had a dirty, back illuminated, mounted CCD (2k x 4K) made by LBNL that looked like it had leopard spots on images. It was probably from condensation during warm up in the dewar. The stops were visible to the naked eye using a green inspection lamp.We cleaned the backside using "Clean n' dry" cleaner made by Clean Room Products (NY), now defunct I'm told. The product is a low ion, filtered soap for cleaning, get this, clean room floors! It is used in our micro systems lab for cleaning CCD's that still had photo-resist on the front side. The cleaner did not attack the photo-resist. (they tried several products years ago, and eventually discovered serendipitously this stuff worked the best for their purposes). We built a special fixture that allowed us to rotate the back side up (ie. almost horizontal) for cleaning. We applied the soap, and used a "foam Q - tip" (std clean room issue) to rub the back side surface. We rinsed (see below) and repeated the process. When really clean , the water just drains off without leaving (visible!)drips on the surface. There may be a residual dirty line on the lower most edge of the silicon, but in our case it was not in the active area of the CCD. One can use the foam applicator to pick off drops from the bottom, if desired. To rinse, we rotated the back side ~120 deg (ie past vertical) to minimize the water getting into the wire bonds on the front side, and rinsed with DI water several times using a squeeze bottle. The wirebonds (on the reverse side from where we cleaning) did get wet, and held some drips of water (+ soap, probably). We let the device dry overnight, in the class 100K clean room where we did all the cleaning! (gives new meaning to the words "clean room") A wire bond broke during the cleaning process, but we re-bonded it. In subsequent images at 135 degK, the leopard spots were gone. Several months later one of the outputs of the CCD died, but I believe its unrelated to the cleaning... This was an R&D CCD under heavy testing. My source of the soap says a possible new candidate might be http://www.chipseparations.com/koolkleenapplication.htm as the company Clean Room Products went out of business. No guarantee's, however. be good richard kadel. -------------- next part -------------- A non-text attachment was scrubbed... Name: rwkadel.vcf Type: text/x-vcard Size: 144 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040818/24a8c3a3/attachment.vcf From smt at ing.iac.es Thu Aug 19 10:31:10 2004 From: smt at ing.iac.es (Simon Tulloch) Date: Thu, 19 Aug 2004 15:31:10 +0100 Subject: CCD-world: Cleaning CCD's References: <4123BCDF.4070706@lbl.gov> Message-ID: <009c01c485f9$2c3d9200$e12448a1@ing.iac.es> Hi, I once successfully cleaned a TEK1024 CCD that was contaminated with vacuum oil using the 'spin' method. I mounted the chip on a cooling fan with the rotation axis passing perpendicular to the chip centre. I then dripped a mixture of ethanol and acetone from a syringe onto the chip. Centrifugal action ensured a residue-free finish. Regards Simon ----- Original Message ----- From: "Richard Kadel" To: "Optical & SWIR imager development for professional astronomy" Sent: Wednesday, August 18, 2004 9:32 PM Subject: CCD-world: Cleaning CCD's > > We had a dirty, back illuminated, mounted CCD (2k x 4K) made by LBNL > that looked like it had leopard spots on images. It was probably > from condensation during warm up in the dewar. The stops > were visible to the naked eye using a green inspection lamp.We cleaned > the backside > using "Clean n' dry" cleaner made by Clean Room Products (NY), now > defunct I'm told. The product is a low ion, filtered soap for cleaning, > get this, clean room floors! It is used in our micro systems lab for > cleaning CCD's that still had > photo-resist on the front side. The cleaner did not attack the photo-resist. > (they tried several products years ago, and eventually discovered > serendipitously this > stuff worked the best for their purposes). > > We built a special fixture that allowed us to rotate the back side up > (ie. almost horizontal) for cleaning. We applied the soap, and > used a "foam Q - tip" (std clean room issue) to rub the back side surface. > > We rinsed (see below) and repeated the process. When > really clean , the water just drains off without leaving (visible!)drips > on the > surface. There may be a residual dirty line on the lower most edge > of the silicon, but in our case it was not in the active area of the CCD. > One can use the foam applicator to pick off drops from the bottom, if > desired. > > To rinse, we rotated the back side ~120 deg (ie past > vertical) to minimize the water getting into the wire bonds on the > front side, > and rinsed with DI water several times using a squeeze bottle. The > wirebonds (on > the reverse side from where we cleaning) did get wet, and held > some drips of water (+ soap, probably). We let the device dry overnight, > in the class 100K clean room where we did all the cleaning! > (gives new meaning to the words "clean room") > > A wire bond broke during the cleaning process, but > we re-bonded it. In subsequent images at 135 degK, > the leopard spots were gone. Several months > later one of the outputs of the CCD died, but I believe its unrelated > to the cleaning... This was an R&D CCD under heavy testing. > > My source of the soap says a possible new candidate might be > > http://www.chipseparations.com/koolkleenapplication.htm > > as the company Clean Room Products went out of business. > No guarantee's, however. > > be good > > richard kadel. > > > > > ---------------------------------------------------------------------------- ---- > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world > From gbo at ct.astro.it Thu Aug 19 11:19:22 2004 From: gbo at ct.astro.it (Giovanni Bonanno) Date: Thu, 19 Aug 2004 17:19:22 +0200 Subject: CCD-world: 50-50 In-Reply-To: <4123F244.274D6F1A@astro.caltech.edu> References: <19c.281bc102.2e53cbff@aol.com> <4123F244.274D6F1A@astro.caltech.edu> Message-ID: <200408191719220535.00441050@smtp.ct.astro.it> Hello, I used the same technique described by Roger, with good success. Unfortunately we have had more than one contamination problem. To heat the CCD we used the same cryostat hosting the detector. The first time we experimented that the contaminant evaporated on the cryostat window. Then, if don't want to clean the dewar window after the evaporation, you can replace the window with an aluminum stopper. We settled the temperature at 50 ?C. This temperature has been good to evaporate the particular contaminant on our CCD. Regards, Giovanni Bonanno *********** REPLY SEPARATOR *********** On 18/08/2004 at 17.20 Roger Smith wrote: >Phil, > >If the contaminant is a film of material which has condensed rather than >particles or crystals left behind after evaporation of a contaminant, a >low risk option is to heat the detector to ~50C in vacuum to simply >evaporate the film. The worst case I ran into was cryopumped vacuum >grease which had moved over the course of months from a hidden >overgreased O-ring on the window to the CCD over the course of months. >It took days (a week?) to come off but it did go eventually. I have >done this with SITe424A (2Kx2K) and SITe ST002A (2Kx4K) CCDs. 50C is >conservative I think. > > -- Roger > > > >-- CCD-world -- >CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >Standard replies will go to the list; address personal replies manually. >For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From tmca at ctiosz.ctio.noao.edu Tue Aug 24 17:42:23 2004 From: tmca at ctiosz.ctio.noao.edu (Tim Abbott) Date: Tue, 24 Aug 2004 17:42:23 -0400 (CLT) Subject: CCD-world: Gifford-McMahon cryocoolers Message-ID: Hi All, Does anyone have experience with Gifford-McMahon cryocoolers for CCD cooling? Vibration control issues, longevity, maintenance, reliability, anything the literature doesn't tell you and you find out about when it's too late...? Cheers, Tim -- Tim Abbott, tabbott at noao.edu, www.ctio.noao.edu/~tmca CTIO, Casilla 603, La Serena, Chile, +56 51 205200 or NOAO/CTIO, P.O. Box 26732, Tucson, AZ 85726-6732, USA, +1 520 318 8259 ---- If you don't look hard enough, you'll see things that aren't there ---- From gas at aaoepp.aao.GOV.AU Tue Aug 24 19:48:28 2004 From: gas at aaoepp.aao.GOV.AU (Greg Smith) Date: Wed, 25 Aug 2004 09:48:28 +1000 Subject: CCD-world: Gifford-McMahon cryocoolers In-Reply-To: References: Message-ID: <412BD3CC.2040105@aao.gov.au> Hi Tim, We have used them very successfully on our IRIS infrared imager/spectrograph, 2dF spectrographs and on IRIS2. Cleanliness in gas lines is ABSOLUTELY essential. Because gas is helium attention must be paid to sealing. We have generally used stainless steel tube and flexibles with attention paid to deburring, degreasing and sealing - working gas is helium. We have also included G10 electrical isolation elements into the piping system as part of our earthing/isolation scheme - our dewar shell is isolated from direct connection to ground. The cold heads do vibrate. Basically the heads we used have a stepper motor running as a two phase synchronous motor and the frequency is locked to the electrical mains frequency - in our case 50 Hz. For IRIS2 we designed a vibration isolator using commercial elastomer dampers and stainless steel bellows to provide 10:1 attenuation at the driving frequency. We paid attention to flexibility of our cold straps connecting heads to cooled hardware. The induction motors in the compressors also run at a speed dependent on mains frequency. Remember that the cooling capacity of the system is determined by the mains frequency, so use the correct cooling capacity curves when selecting your system. Most GM coolers are two stage and we connected first stage, which has larger cooling capacity but higher ultimate temperature, to the general cooled structure and radiation shields, and the second stage to the detector. The detector temperature was regulated using a heater powered from a commercial controller. We put charcoal getters on both the stages so that the coldest point in the dewar was always a getter, even in the cooldown and warmup cycles. The cold heads seem to be insensitive to orientaion but the compressors must be kept vertical. Our earlier systems had compressors hanging from gallows on the side of the telescope but we now have a He reticulation system through the cable wrap. Generally, I would have to say they are reliable once the lines are cleaned properly, but you should consider a temperature alarm (and vacuum alarm) system to warn of failure. We were lucky to have help from the people at the Australia Telescope who had extensive experience with GM coolers when we did need to strip cold heads and diagnose problems.. I am sure someone at Gemini should be able to comment on reliability - I've seen over a dozen compressers in racks in their compressor room. I am sure other big telescopes will also have comments. Good luck, Greg ======================= Tim Abbott wrote: >Hi All, > >Does anyone have experience with Gifford-McMahon cryocoolers for CCD >cooling? Vibration control issues, longevity, maintenance, >reliability, anything the literature doesn't tell you and you find out >about when it's too late...? > >Cheers, > > Tim > > > > From pamico at keck.hawaii.edu Mon Sep 6 00:58:13 2004 From: pamico at keck.hawaii.edu (Paola Amico) Date: Sun, 5 Sep 2004 18:58:13 -1000 Subject: CCD-world: Scientific Detector Workshop 2005 - the ball is rolling Message-ID: <1C1CA6FB6B4238409BA345F13C9723EB42FDCE@winserver2.keck.hawaii.edu> Dear CCD World, As some of you already know, the site of the Scientific Detector Workshop 2005 (SDW2005) was chosen by our community in an E-mail voting process conducted this past Spring. The selected site is Taormina, Italy (in Sicily) and the date is 19-25 June 2005. The Observatory of Catania is our host organization and will be working closely with us to prepare the best workshop yet. We (Paola and Jim) will be traveling to Sicily in October to finalize the arrangements. By some time this December, the official announcement will be made and registration will be open. Please mark your calendars for June 2005 and plan to register early since we expect the workshop will be oversubscribed. Ciao, Jim & Paola P.S. The workshop publisher, Kluwer, has been merged with Springer and we have already received commitment from Springer to continue with the proceedings series. We are making arrangements for "fast track" editing and publishing. Therefore, start planning and writing your papers now! From atwood at phyas1.mps.ohio-state.edu Mon Sep 13 10:59:30 2004 From: atwood at phyas1.mps.ohio-state.edu (Bruce Atwood) Date: Mon, 13 Sep 2004 10:59:30 -0400 Subject: CCD-world: RTV 142 Message-ID: <4145B5D2.2030401@ohstpy.mps.ohio-state.edu> Do any of you have a source of RTV 142? thanks -- -- Bruce Atwood Research Scientist Imaging Sciences Laboratory Astronomy Department The Ohio State University 140 W. 18th Ave. Columbus, Ohio 43210-1173 (614) 292 6279 (V) (614) 292 2928 (F) From apo at mso.anu.edu.au Wed Sep 15 18:39:21 2004 From: apo at mso.anu.edu.au (Paddy Oates) Date: Thu, 16 Sep 2004 08:39:21 +1000 Subject: CCD-world: Re: irregular readout with ARC45 Message-ID: <4148C499.3000806@mso.anu.edu.au> Hi all - on sdsu world and ccd world! Yes - I would also be interested in Bobs response.... Attached are 3 JPG images - the 1st (RT-Chip-Structure-1.jpg) is an image taken as our detector - an e2v, 4240 was cooling down - as you can see - there are all the usual features - including a dark current structure (confirmed by contact with e2v last night) marked 'HERE'. This is a 3sec exposure at -30C. The 2nd (FF-1.jpg) is a 10 second white light flat(ish) field exposure - showing a strange banding effect AND evidence that the dark current structure has 'poked-up' into the image. This type of frame is occurring randomly, but at about 1 in 10 frames. The features on this frame are always exactly the same. The last (CCD0836.jpg) is an image taken at the telescope - showing exactly the same effect... I now know what it is (the structure on the 1st frame matches exactly those on the 2nd and 3rd) - but not HOW its happening - Anyone any ideas??? Cheers Paddy -------------- next part -------------- A non-text attachment was scrubbed... Name: RT-Chip-Structure-1.jpg Type: image/jpeg Size: 256302 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040916/9e16e33b/attachment.jpg -------------- next part -------------- A non-text attachment was scrubbed... Name: FF-1.jpg Type: image/jpeg Size: 359059 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040916/9e16e33b/attachment-0001.jpg -------------- next part -------------- A non-text attachment was scrubbed... Name: CCD0836.jpg Type: image/jpeg Size: 136843 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040916/9e16e33b/attachment-0002.jpg From apo at mso.anu.edu.au Wed Sep 15 18:42:26 2004 From: apo at mso.anu.edu.au (Dr. Paddy Oates) Date: Thu, 16 Sep 2004 08:42:26 +1000 Subject: CCD-world: Re: irregular readout with ARC45 In-Reply-To: <1095264376.1928.72.camel@grigri.hill.lowellnet> References: <1095220980.1362.9.camel@grigri.hill.lowellnet> <4147E877.1080902@mso.anu.edu.au> <1095264376.1928.72.camel@grigri.hill.lowellnet> Message-ID: <4148C552.9000607@mso.anu.edu.au> Hi Brian I may have misled you. Everything in the frame is ok - except the region marked 'HERE' - that's the dark current structure which is 'popping up' as it were - in normal flat-field readouts at operating temp at about the rate of 1 in 10 frames. We also see a full well change of ~3 down at about the same rate. The stitching and other 'features' all vanish when the chip gets to operating temp. Cheers Paddy -- ++Surfing in CyberSpace on the Wings of a Storm+++| Senior Detector Engineer. MSSSO, RSAA. | Ph: +61 2 6125 8909 Fax: +61 2 6125 5635 | W: http://users.tpg.com.au/adsllljc/ | e: apo at mso.anu.edu.au | --------------------------------------------------/ From apo at mso.anu.edu.au Wed Sep 15 22:49:28 2004 From: apo at mso.anu.edu.au (Dr. Paddy Oates) Date: Thu, 16 Sep 2004 12:49:28 +1000 Subject: CCD-world: Re: irregular readout with ARC45 -change of subject In-Reply-To: <410-22004941622811312@earthlink.net> References: <410-22004941622811312@earthlink.net> Message-ID: <4148FF38.6080004@mso.anu.edu.au> Hi all I have found the source of the problem I suspected either a hardware cause or DSP code. A couple of weeks before we took the IMager to SS we installed a new Front panel to the SDSU - tidying the internal connections etc. BUT we also assigned the 3 Vertical phase clocks to new pins moving them from Clock designation CLK3 to CLK2 (i.e moving them physically from 3 of the lower clock bank pins to 3 spare on the top bank) . As a means of defining the IO2 phase as default hi - I swapped the DAC assignment for this phase - and all looked good. BUT if I go back to the old panel (with its messy internal wiring!) with the old pin assignments and the V phases on CLK3 - the problem goes away! So there must be some wave form where the IO2 is in an indeterminate state, maybe only momentary, but results in the apparent loss of full well, the banding and the odd dark current feature showing up. Strange. Need to go thru my code now and find where its happening - so I can revert back to the new front panel design This is what I suspect is happening at the mo. I have just done 30 repeated 10s FF and not seen one of the frames corrupted - whereas before it was happening - at worse - 3-4 times in 10 Thanks for the suggestions Cheers Paddy -- ++Surfing in CyberSpace on the Wings of a Storm+++| Senior Detector Engineer. MSSSO, RSAA. | Ph: +61 2 6125 8909 Fax: +61 2 6125 5635 | W: http://users.tpg.com.au/adsllljc/ | e: apo at mso.anu.edu.au | --------------------------------------------------/ From gordon.hopkinson at sira.co.uk Thu Sep 16 04:24:11 2004 From: gordon.hopkinson at sira.co.uk (Hopkinson, Gordon) Date: Thu, 16 Sep 2004 09:24:11 +0100 Subject: CCD-world: Re: irregular readout with ARC45 Message-ID: <90176089A75AB54592013B635D928E05D567@EPICURUS> Hi Paddy and CCD-world I recently did some radiation testing on a set of CCD42-40 devices. The first problem I had was that there was a large amount of spurious charge from the gate protection structures. This was cured by turning down the clock amplitudes. Presumably you have done the same (or don't have the gate protection). I also saw dark current patterns at -30C presumably due to features in the device processing (varied from chip to chip - but not unlike your first picture). When doing the radiation testing I noticed that there was a fair amount of residual charge - if the CCD had its clocks stopped or was exposed to light then the dark signal was very much larger. After several long exposures it returned to normal. - I guess it gets trapped somewhere and takes a while to be clocked out (like tens of minutes at -100C). Best Regards Gordon Hopkinson _______________________________ Dr G R Hopkinson Sira Technology Ltd South Hill Chislehurst Kent BR7 5EH UK Tel. +44 (0)208 467 2636 Direct Dial +44 (0)208 468 1794 Fax. +44 (0)208 467 6515 E-mail: gordon.hopkinson at sira.co.uk http://www.siraeo.co.uk ___________________________________________________________ This message and any attachments is for the intended addressee only. Please contact us immediately if you have received this transmission in error. If you are not the intended recipient, you should note that any use, copying, disclosure or distribution of this information is strictly prohibited. The views of the author may not necessarily constitute the views of Sira Technology Ltd. Nothing in this email shall bind Sira Technology Ltd in any contract or obligation. _________________________________________________________ -----Original Message----- From: Paddy Oates [mailto:apo at mso.anu.edu.au] Sent: 15 September 2004 23:39 To: ccd-world at ctio.noao.edu; sdsu at lowell.edu Subject: CCD-world: Re: irregular readout with ARC45 << File: RT-Chip-Structure-1.jpg >> << File: FF-1.jpg >> << File: CCD0836.jpg >> << File: ATT209709.txt >> Hi all - on sdsu world and ccd world! Yes - I would also be interested in Bobs response.... Attached are 3 JPG images - the 1st (RT-Chip-Structure-1.jpg) is an image taken as our detector - an e2v, 4240 was cooling down - as you can see - there are all the usual features - including a dark current structure (confirmed by contact with e2v last night) marked 'HERE'. This is a 3sec exposure at -30C. The 2nd (FF-1.jpg) is a 10 second white light flat(ish) field exposure - showing a strange banding effect AND evidence that the dark current structure has 'poked-up' into the image. This type of frame is occurring randomly, but at about 1 in 10 frames. The features on this frame are always exactly the same. The last (CCD0836.jpg) is an image taken at the telescope - showing exactly the same effect... I now know what it is (the structure on the 1st frame matches exactly those on the 2nd and 3rd) - but not HOW its happening - Anyone any ideas??? Cheers Paddy From tdroege2 at earthlink.net Wed Sep 15 22:28:11 2004 From: tdroege2 at earthlink.net (Thomas Droege) Date: Wed, 15 Sep 2004 21:28:11 -0500 Subject: CCD-world: Re: irregular readout with ARC45 Message-ID: <410-22004941622811312@earthlink.net> Looks like noise pickup to me. > image. This type of frame is occurring randomly, but at about 1 in 10 > frames. The features on this frame are always exactly the same. The last I smell a computer somewhere doing something from time to time. Is every computer like thing far away with nothing even close to the grounds/returns where the analog signals go? Here is how I go after noise problems. Make a complete drawing of all the signal paths and *all the return paths*. Make a complete shielding drawing. In most cases about half way through the task you will find something and go Oh! This is not an easy thing to do. I can never do it right and as I work on it and think about it the drawing keeps getting more complicated with more currents going through return wires and from time to time a common current found. Yes, I design a star system for the returns. In general all signals go on wire pairs carefully designed to carry no other signal. But it is often not so easy to keep other signals out. This is particularly true when capacitive currents are included. An example. Suppose there is a preamplifier by the CCD. It drives a wire to somewhere where it is received and goes into a DCS chain ending up at an ADC. The distance can be only 1 cm and there can be a problem with a 16 bit system. Draw an arrow on the output down the path to the DCS end. Now figure out where the return current from this signal goes. If it is not immediately obvious, then you have a problem. If anything else can put a current in this path then you have a problem. I can discuss this at great length but I risk being boring. Tom Droege > [Original Message] > From: Paddy Oates > To: ; > Date: 9/16/2004 1:40:31 PM > Subject: CCD-world: Re: irregular readout with ARC45 > > Hi all - on sdsu world and ccd world! > > Yes - I would also be interested in Bobs response.... > > Attached are 3 JPG images - the 1st (RT-Chip-Structure-1.jpg) is an > image taken as our detector - an e2v, 4240 was cooling down - as you > can see - there are all the usual features - including a dark current > structure (confirmed by contact with e2v last night) marked 'HERE'. This > is a 3sec exposure at -30C. The 2nd (FF-1.jpg) is a 10 second white > light flat(ish) field exposure - showing a strange banding effect AND > evidence that the dark current structure has 'poked-up' into the > image. This type of frame is occurring randomly, but at about 1 in 10 > frames. The features on this frame are always exactly the same. The last > (CCD0836.jpg) is an image taken at the telescope - showing exactly the > same effect... I now know what it is (the structure on the 1st frame > matches exactly those on the 2nd and 3rd) - but not HOW its happening - > Anyone any ideas??? > > Cheers > Paddy From Marc.Baril at nrc-cnrc.gc.ca Thu Sep 16 12:36:53 2004 From: Marc.Baril at nrc-cnrc.gc.ca (Baril, Marc) Date: Thu, 16 Sep 2004 12:36:53 -0400 Subject: CCD-world: Re: irregular readout with ARC45 Message-ID: I concur with Thomas, I've seen this behaviour more than once on different systems. I assume that the diagonal bands occur at random positions on the image every time. I would start by trying to determine the frequency of the noise source from your image (it seems to be very well defined) to determine if it coincides with an obvious source (i.e. a nearby switching power supply) - this may provide some hints. Marc Baril -----Original Message----- From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu]On Behalf Of Thomas Droege Sent: Wednesday, September 15, 2004 7:28 PM To: Optical & SWIR imager development for professional; ccd-world at ctio.noao.edu; sdsu at lowell.edu Subject: RE: CCD-world: Re: irregular readout with ARC45 Looks like noise pickup to me. > image. This type of frame is occurring randomly, but at about 1 in 10 > frames. The features on this frame are always exactly the same. The last I smell a computer somewhere doing something from time to time. Is every computer like thing far away with nothing even close to the grounds/returns where the analog signals go? Here is how I go after noise problems. Make a complete drawing of all the signal paths and *all the return paths*. Make a complete shielding drawing. In most cases about half way through the task you will find something and go Oh! This is not an easy thing to do. I can never do it right and as I work on it and think about it the drawing keeps getting more complicated with more currents going through return wires and from time to time a common current found. Yes, I design a star system for the returns. In general all signals go on wire pairs carefully designed to carry no other signal. But it is often not so easy to keep other signals out. This is particularly true when capacitive currents are included. An example. Suppose there is a preamplifier by the CCD. It drives a wire to somewhere where it is received and goes into a DCS chain ending up at an ADC. The distance can be only 1 cm and there can be a problem with a 16 bit system. Draw an arrow on the output down the path to the DCS end. Now figure out where the return current from this signal goes. If it is not immediately obvious, then you have a problem. If anything else can put a current in this path then you have a problem. I can discuss this at great length but I risk being boring. Tom Droege > [Original Message] > From: Paddy Oates > To: ; > Date: 9/16/2004 1:40:31 PM > Subject: CCD-world: Re: irregular readout with ARC45 > > Hi all - on sdsu world and ccd world! > > Yes - I would also be interested in Bobs response.... > > Attached are 3 JPG images - the 1st (RT-Chip-Structure-1.jpg) is an > image taken as our detector - an e2v, 4240 was cooling down - as you > can see - there are all the usual features - including a dark current > structure (confirmed by contact with e2v last night) marked 'HERE'. This > is a 3sec exposure at -30C. The 2nd (FF-1.jpg) is a 10 second white > light flat(ish) field exposure - showing a strange banding effect AND > evidence that the dark current structure has 'poked-up' into the > image. This type of frame is occurring randomly, but at about 1 in 10 > frames. The features on this frame are always exactly the same. The last > (CCD0836.jpg) is an image taken at the telescope - showing exactly the > same effect... I now know what it is (the structure on the 1st frame > matches exactly those on the 2nd and 3rd) - but not HOW its happening - > Anyone any ideas??? > > Cheers > Paddy -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From Paul.Jorden at e2v.com Thu Sep 16 11:10:34 2004 From: Paul.Jorden at e2v.com (Jorden, Paul) Date: Thu, 16 Sep 2004 16:10:34 +0100 Subject: CCD-world: RTV 142 Message-ID: <4F826F960057D4118EC3009027E2453810A7F3F7@whl17.e2v.com> Bruce & others, We use NUSIL CV1142 which is a space qualified nom-slump RTV. It sounds similar. I can find out who our supplier is if required. best wishes, paul _________________________________________________________ Dr Paul Jorden, CCD Sensors, e2v technologies Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK Tel: +44 (0)1245 -453458 (direct), -493493 (switchboard) Fax: +44 (0)1245 453224 (local), -492492 (central) http://ccds.e2v.com/ -----Original Message----- From: Bruce Atwood [mailto:atwood at phyas1.mps.ohio-state.edu] Sent: 13 September 2004 16:00 To: ccd-world at ctio.noao.edu Subject: CCD-world: RTV 142 Do any of you have a source of RTV 142? thanks -- Bruce Atwood Research Scientist Imaging Sciences Laboratory Astronomy Department The Ohio State University 140 W. 18th Ave. Columbus, Ohio 43210-1173 (614) 292 6279 (V) (614) 292 2928 (F) -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From apo at mso.anu.edu.au Thu Sep 16 18:51:59 2004 From: apo at mso.anu.edu.au (Dr. Paddy Oates) Date: Fri, 17 Sep 2004 08:51:59 +1000 Subject: CCD-world: Re: irregular readout with ARC45 In-Reply-To: <200409161735.27794.tdroege2@earthlink.net> References: <410-22004941624043406@earthlink.net> <4148FF8C.60709@mso.anu.edu.au> <200409161735.27794.tdroege2@earthlink.net> Message-ID: <414A190F.3060406@mso.anu.edu.au> Dear all (and Tom, Gorden et al) Many thanks for all the useful responses - it feels a bit like ... 'the old days..' :-) 1st off. Let me be clear - I did not consider this an E2V detector problem. But - I wanted to 1st ascertain WHERE the funny pattern was originating before seeking to find why it was cropping up. So the patterning is caused by dark current structure which is cropping up at random (about 3 frames in 10) - but due to some weird V-clocking effect. The asymmetry of it, Paul J at E2V has suggested, is due to the chip's location on the wafer during processing - it was device 4 on on the RHS of the group that were cut from the Silicon.... So all that is normal. As I mentioned yesterday - reverting back to the old front panel hardware and hence the original DSP wave form table - completely removes the problem. So - at the moment - I suspect my wave form tables - but haven't discounted a hardware problem either. The diagonal bands are always in the SAME place and there are always 22 of them!! This makes me think its not noise - it could be a coupling problem somewhere - but would have to be occurring with the same properties - but at random. I have changed the V clock voltage - dramatically - but the effect doesn't go away - I don't think our device has the gate protetion structures.And note this effect occurred at the telescope and here in the lab - with exactly the same pattern. Distance of lab to telescope = 700 Kms!! So I think the source is in the controller - either hardware or DSP - I suspect MY DSP code!! Will find out today I hope - want this back on the 2.3m - next week Cheers PAddy -- ++Surfing in CyberSpace on the Wings of a Storm+++| Senior Detector Engineer. MSSSO, RSAA. | Ph: +61 2 6125 8909 Fax: +61 2 6125 5635 | W: http://users.tpg.com.au/adsllljc/ | e: apo at mso.anu.edu.au | --------------------------------------------------/ From tylinskig at asme.org Mon Sep 20 19:35:08 2004 From: tylinskig at asme.org (George Tylinski) Date: Mon, 20 Sep 2004 16:35:08 -0700 Subject: CCD-world: RTV 142 In-Reply-To: <4145B5D2.2030401@ohstpy.mps.ohio-state.edu> References: <4145B5D2.2030401@ohstpy.mps.ohio-state.edu> Message-ID: <1095723308.23246.204779991@webmail.messagingengine.com> http://www.mgchemicals.com/products/142.html via Google, but non-stocked item. RTV 142 is a nice material, I hope you find a distributor. On Mon, 13 Sep 2004 10:59:30 -0400, "Bruce Atwood" said: > Do any of you have a source of RTV 142? > > thanks Best Regards, George Tylinski George Tylinski Mechanical Design & Analysis 503-515-3338 From mbdenton at u.arizona.edu Mon Sep 27 14:44:07 2004 From: mbdenton at u.arizona.edu (M. Bonner Denton) Date: Mon, 27 Sep 2004 11:44:07 -0700 Subject: CCD-world: Electrical Engineer Position Available Message-ID: <000a01c4a4c1$f8844d40$3757c480@DOFFICE2> Position Available: Senior Electrical Engineer. For design of support electronics for revolutionary new ion detectors. Experience in low-level, ultra-low-noise analog circuitry, analog to digital, and digital control required. Familiarity with programmable logic arrays, and/or CCD cameras, etc., desirable. For full position details see job posting #31626 at www.hr.arizona.edu/jobs. A cover letter, resume, and the names and contact information for three references should be submitted via the on-line application system. Evaluation of applications begins 10/1/04 and will continue until the position is filled. The University of Arizona is an EEO/ADA/AA Employer, M/W/D/V. The Immigration and Reform Act requires you to have proof of authorization to work in the U.S.A. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040927/6cec52a4/attachment.html From rmg at astro.caltech.edu Mon Sep 27 16:32:49 2004 From: rmg at astro.caltech.edu (rich goeden) Date: Mon, 27 Sep 2004 13:32:49 -0700 Subject: CCD-world: RTV 142 In-Reply-To: <1095723308.23246.204779991@webmail.messagingengine.com> References: <4145B5D2.2030401@ohstpy.mps.ohio-state.edu> <1095723308.23246.204779991@webmail.messagingengine.com> Message-ID: <415878F1.6060800@astro.caltech.edu> Go to any of the links below, but specifically the last one. I called R.S. Hughes and they have two tubes in stock. Rich Goeden Caltech Astronomy www.gesilicones.com/gesilicones/am1/en/grade/mastergrade_kit_one_part.jsp?masterGradeId=736&industryId=2&applicationId=142&applicationAreaId=45 www.gesilicones.com/gesilicones/am1/en/common/how_to_buy.jsp www.gesilicones.com/gesilicones/am1/en/common/distributor_locator.jsp R S HUGHES PACOIMA 10639 GLENOAKS BLVD PACOIMA, CA Call: 818 686-9111 Fax: 818 686-1973 George Tylinski wrote: > http://www.mgchemicals.com/products/142.html via Google, but non-stocked > item. > RTV 142 is a nice material, I hope you find a distributor. > > On Mon, 13 Sep 2004 10:59:30 -0400, "Bruce Atwood" > said: > >>Do any of you have a source of RTV 142? >> >>thanks > > > Best Regards, > George Tylinski > George Tylinski Mechanical Design & Analysis > 503-515-3338 > > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From Venkatraman.Iyer at kla-tencor.com Thu Sep 30 20:37:27 2004 From: Venkatraman.Iyer at kla-tencor.com (Iyer, Venkatraman) Date: Thu, 30 Sep 2004 17:37:27 -0700 Subject: CCD-world: radiation in CCDs Message-ID: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> Hi all, Statement: I am looking into cosmic radiation type effects on CCDs. Is there appropriate shielding that is a ccd community standard? Any information you can share on how u have tackled this problem would be helpful. Experiment: I have been doing 15 hour tests in the lab and recording data in the dark. The setup triggers data collection above a set threshold. The radioactive events seen are single pixel or 2-3 pixel saturated events (200ke)with no point spread. Over the whole energy range, distribution seems Poisson. Don Groom and Al Smith at LBNL have been very helpful in furnishing information and also testing our ceramic package which turned out to have an insignificant radiation count. Data: I see that a teflon block works on the CCD works well in knocking out events. Strangely the Al block i used actually increased the number of events. Is there radioactive Aluminum? Also the half inch lead black sprayed a whole load of events. Is there a source for non-radioactive Pb? Solution: Only solution i can think of is an algorithm fix as the edge speed from dark to bright is telling of a cosmic event. True or false? Any information would be helpful. thanks, Venkat -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20040930/9d36e329/attachment.html From deg at lbl.gov Fri Oct 1 20:21:37 2004 From: deg at lbl.gov (Don Groom) Date: Fri, 1 Oct 2004 17:21:37 -0700 (PDT) Subject: CCD-world: radiation in CCDs In-Reply-To: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> Message-ID: Dear Venkat, Let me make a few additional comments: 0. Main problem is to characterize what you are seeing! 1. 200 k electrons in one pixel (full well) corresponds to an energy deposit of at least 200k/3.7 eV/elect, or 54 keV. That is a lot! As I told you, a cosmic ray muon most probably deposits about 1.2 MeV g^-1 cm^2; I don't know how thick your CCD is or how many pixels are saturated. Unusual to get no point spread. Front illuminated with a very thin sensitive region? 2. You didn't mention the rate. It should be about 1 cm^2/min for the irreduceable cosmic ray muons. 3. Do you have optical glass BK7 or any other K containing materials "within sight" of the CCD in vacuum? That would swamp most things. 4. Astronomers have spent a lot of hours constructing algorithms for finding and eliminating the radiation events. The best is to take several exposures and "AND" them. Also the approach you mention. 5. We do very well with Pb shielding, since our main problem is Compton-scattered electrons 6. Natural Al is 100% Al-27. Al-26 can be generated by the irradiation of something or another, and has a halflife of 720,000 yr. I wouldn't expect you have any. 7. Everyday Pb is usually clean enough for shielding at our level; we do OK with the usual old lead bricks "borrowed" from the nuclear physicists. Al Smith tells us that the cleanest natural Pb comes from the St Joseph Mine in Missouri. Get even cleaner stuff from sunken Roman, like people looking for dark matter do. But your lead spray is strange. High-energy EM cascades would do it, but you don't have that kind of photons around. 8. We built a Ta shield inside the dewar at the Lick 3-m spectrometer, and reduced the Compton's by a factor of two. I had hoped for a little more, but there are a lot of holes. Don |-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+| Don Groom (Particle Data Group, Supernova Cosmology Project) DEGroom(at)lbl(dot)gov www-ccd.lbl.gov 510/486-6788 FAX: 510/486-4799 Analog: 50R6008//1 Cyclotron Road//Berkeley Lab//Berkeley, CA 94720-8166 From deg at lbl.gov Fri Oct 1 20:28:18 2004 From: deg at lbl.gov (Don Groom) Date: Fri, 1 Oct 2004 17:28:18 -0700 (PDT) Subject: CCD-world: CVI (now Spectral Products) DK242 In-Reply-To: <000a01c4a4c1$f8844d40$3757c480@DOFFICE2> Message-ID: I sent this last Monday to the .de address; there's probably a black hole in Denmark. The information would still be useful, although we've since learned they sell only about 5/yr. Don |-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+| All of the observatory-related CCD labs that we have identified (ESO, Lesser, Subaru, etc etc) use exclusively Oriel products for optical components in their instruments for measuring CCD quantum efficiency. Since we are trying to build our own "QE Machine," we are trying to cast a broader net. We've been looking at CVI (now Spectral Products), in particular their DK242 double spectrometer. It seems to have superior specs and lower price as compared to its Oriel counterparts. The only problem is getting input from people who have used CVI monochromators. If I ask Spectral Products for references, they will probably put me in contact with their most satisfied customers, hardly an unbiased sample. Know anyone, or where the CVI monochromators are in use? Thanks Don -- |-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+|-+| Don Groom (Particle Data Group, Supernova Cosmology Project) DEGroom(at)lbl(dot)gov www-ccd.lbl.gov 510/486-6788 FAX: 510/486-4799 Analog: 50R6008//1 Cyclotron Road//Berkeley Lab//Berkeley, CA 94720-8166 From waterson at ifa.hawaii.edu Fri Oct 1 18:37:15 2004 From: waterson at ifa.hawaii.edu (Mark Waterson) Date: Fri, 01 Oct 2004 12:37:15 -1000 Subject: CCD-world: radiation in CCDs In-Reply-To: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> References: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> Message-ID: <415DDC1B.1020705@ifa.hawaii.edu> I am not an expert in ionizing radiation detectors, however I have worked with a group (originally John Simpson at the University of Chicago) which has a cosmic ray neutron monitor set up on Haleakala (there are other stations around the world as well). From the project web site I have copied a short description of the basic idea: " John A. Simpson, at the University of Chicago, invented and developed the neutron monitor over the years 1948-50 and found that the Earth's magnetic field could be used as a spectrometer to allow measurements of the cosmic ray spectrum down to low primary energies. The magnetic latitude of a particular neutron monitor determines the lowest magnetic rigidity of a primary that can reach the monitor, the so-called "cut-off rigidity". The station's altitude determines the amount of absorbing atmosphere above the station and hence the amount of absorption of the secondary cosmic rays (the higher the station, the higher the counting rate). By using a combination of lead (to produce local interactions), paraffin or polyethylene (to moderate or slow down the neutron component) and multiple slow-neutron counters, Simpson greatly increased the counting rate in his monitor design. " The neutron monitor detectors consist of (large) Lead sleeves, contained in UDPE blocks, surrounding high voltage scintillation tubes - so it sounds like you have basically built a similar detector unwittingly. The teflon probably moderates the neutrons to a speed that does not interact with the ccd strongly, while the lead produces secondary particle showers which greatly enhance the count rates. Of course I think if you have enough lead, you can absorb all these events as well, but since the neutron monitor uses 1.5" thick sleeves, you'll probably need quite a bit to do that. I also recall hearing about similar but less energetic particle shower effects in aluminum parts. Shielding cameras is hard - CRs are really high energy, and I see 2-3 events/10 second exposures on a camera located in the basement Coude room of the AEOS observatory here - probably 3 feet of concrete above it (though the events could be coming from radioisotopes in the concrete just as well... ) mfw Mark Waterson University of Hawaii - Institute for Astronomy Haleakala Observatories, Maui 808-876-7600 x108 Kula Office 808-243-5892 Observatory waterson at ifa.hawaii.edu Iyer, Venkatraman wrote: > Hi all, > > _Statement:_ > I am looking into cosmic radiation type effects on CCDs. > Is there appropriate shielding that is a ccd community standard? > Any information you can share on how u have tackled this problem would > be helpful. > > _Experiment:_ > I have been doing 15 hour tests in the lab and recording data in the > dark. The setup triggers data collection above a set threshold. The > radioactive events seen are single pixel or 2-3 pixel saturated events > (200ke)with no point spread. Over the whole energy range, distribution > seems Poisson. > > Don Groom and Al Smith at LBNL have been very helpful in furnishing > information and also testing our ceramic package which turned out to > have an insignificant radiation count. > > _Data:_ > I see that a teflon block works on the CCD works well in knocking out > events. > Strangely the Al block i used actually increased the number of events. > Is there radioactive Aluminum? > Also the half inch lead black sprayed a whole load of events. Is there > a source for non-radioactive Pb? > > _Solution_: > Only solution i can think of is an algorithm fix as the edge speed from > dark to bright is telling of a cosmic event. True or false? > > Any information would be helpful. > > thanks, > > Venkat > > > > > ------------------------------------------------------------------------ > > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From tdroege2 at earthlink.net Fri Oct 1 17:29:47 2004 From: tdroege2 at earthlink.net (Tom Droege) Date: Fri, 1 Oct 2004 16:29:47 -0500 Subject: CCD-world: radiation in CCDs In-Reply-To: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> References: <321D44776C348447B1440547A77C2F681042BC@CA1EXCLV03.adcorp.kla-tencor.com> Message-ID: <200410011629.47787.tdroege2@earthlink.net> Hello Venkat, It is usually not practical to shield against cosmic rays. They come in sizes up to 10^20 ev. You can reduce the number you see by operating in the bottom of a deep mine. Tunnels are also popular to reduce the cosmic rays seen. Not so practical if you want to look at stars. You can find some background in the Q and A at: http://www.auger.org/ If you put something dense between the CCD and the source of the cosmic rays (the sky) then what you see is that the cosmic rays interact in the material and produce pairs (or larger showers). If the cosmic ray hits in images are examined they are often seen to be two closely spaced hits. Since primary cosmic ray can be so energetic you can get almost any "elementary" particle. The Amateur Sky Survey solution to the cosmic ray hit problem is to use dual telescopes and take images simultaneously in two filters. We reject everything that is not simultaneous in both cameras. We are wide field and most stars sit on one pixel so can't use the shape of the hit for rejection which is the usual solution. The rule of thumb is 1 cosmic ray per sq cm per minute when pointing at the zenith. Hope this helps. Tom Droege On Thursday 30 September 2004 07:37 pm, Iyer, Venkatraman wrote: > Hi all, > > Statement: > I am looking into cosmic radiation type effects on CCDs. > Is there appropriate shielding that is a ccd community standard? > Any information you can share on how u have tackled this problem would > be helpful. > > Experiment: > I have been doing 15 hour tests in the lab and recording data in the > dark. The setup triggers data collection above a set threshold. The > radioactive events seen are single pixel or 2-3 pixel saturated events > (200ke)with no point spread. Over the whole energy range, distribution > seems Poisson. > > Don Groom and Al Smith at LBNL have been very helpful in furnishing > information and also testing our ceramic package which turned out to > have an insignificant radiation count. > > Data: > I see that a teflon block works on the CCD works well in knocking out > events. > Strangely the Al block i used actually increased the number of events. > Is there radioactive Aluminum? > Also the half inch lead black sprayed a whole load of events. Is there > a source for non-radioactive Pb? > > Solution: > Only solution i can think of is an algorithm fix as the edge speed from > dark to bright is telling of a cosmic event. True or false? > > Any information would be helpful. > > thanks, > > Venkat From tg.burke at ngc.com Mon Oct 4 08:42:56 2004 From: tg.burke at ngc.com (Burke, Thomas G.) Date: Mon, 4 Oct 2004 08:42:56 -0400 Subject: CCD-world: radiation in CCDs Message-ID: google "Microelectronics and Photonics Test Bed" - a good place to start for CCD phenomonology... You will find that CCD offset & single event effects grow slowly over time, with large jumps that are directly attributible to solar flares. You might check into Maxwell's (used to be SEI) RadPack stuff - they use an Ytrium-Tungsten packaging that is very dense, and works well against electrons, if not heavy ions. (read that as very heavy) -Tom -----Original Message----- From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu]On Behalf Of Iyer, Venkatraman Sent: Thursday, September 30, 2004 8:37 PM To: Optical & SWIR imager development for professional astronomy Subject: CCD-world: radiation in CCDs Hi all, Statement: I am looking into cosmic radiation type effects on CCDs. Is there appropriate shielding that is a ccd community standard? Any information you can share on how u have tackled this problem would be helpful. Experiment: I have been doing 15 hour tests in the lab and recording data in the dark. The setup triggers data collection above a set threshold. The radioactive events seen are single pixel or 2-3 pixel saturated events (200ke)with no point spread. Over the whole energy range, distribution seems Poisson. Don Groom and Al Smith at LBNL have been very helpful in furnishing information and also testing our ceramic package which turned out to have an insignificant radiation count. Data: I see that a teflon block works on the CCD works well in knocking out events. Strangely the Al block i used actually increased the number of events. Is there radioactive Aluminum? Also the half inch lead black sprayed a whole load of events. Is there a source for non-radioactive Pb? Solution: Only solution i can think of is an algorithm fix as the edge speed from dark to bright is telling of a cosmic event. True or false? Any information would be helpful. thanks, Venkat -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041004/a99563a3/attachment.html From cdm at ast.cam.ac.uk Tue Oct 5 08:45:13 2004 From: cdm at ast.cam.ac.uk (Craig Mackay) Date: Tue, 05 Oct 2004 13:45:13 +0100 Subject: CCD-world: EMCCD Gain feature. Message-ID: <41629759.7010502@ast.cam.ac.uk> An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041005/6b181f1e/attachment.html From jhynecek at netscape.net Tue Oct 5 11:44:09 2004 From: jhynecek at netscape.net (Jerry) Date: Tue, 05 Oct 2004 10:44:09 -0500 Subject: CCD-world: EMCCD Gain feature. In-Reply-To: <41629759.7010502@ast.cam.ac.uk> References: <41629759.7010502@ast.cam.ac.uk> Message-ID: <4162C149.1040306@netscape.net> Dear CCD World. I would like to make a comment on this. "The sense of this is that the gain is increased by the presence of large amounts of signal. The overall effect is that the gain delivered by the multiplication register has a signal dependent component." Typically, the presence of charge in the CCD register lowers the field. This would normally cause a reduction of gain. This effect has been recognized early during the design phase of Texas Instruments Charge Multiplying CCDs and minimized as described in the latest SPIE article. "Although we have not tested the Texas instruments EMCCDs we would expect them in principle to work the same way - although the details would of course be somewhat different." Please do not make claims if you have not verified them by testing. Regards, Jerry Hynecek Consultant -------------------------------------- cdm at ast.cam.ac.uk wrote: > Dear CCD-World, > > We have discovered an operational problem with EMCCDs that prospective > users should be aware of. You will know that the gain of the > multiplication register in these devices is adjusted by changing the > amplitude of a high-voltage clock phase in the multiplication > register. If you use the device with reasonably high gain then the > gain is a strong > function of this voltage, with 0.5 volts corresponding to a factor of > as much as two or three at gains of several thousands with the devices > from E2V. When working with a signal level that approaches the > maximum that can be transferred efficiently the large signal affects > the voltage on each electrode and therefore affects the gain of that > electrode. The sense of this is that the gain is increased by the > presence of large amounts of signal. > > The overall effect is that the gain delivered by the multiplication > register has a signal dependent component. > > It is important that this effect is recognised and calibrated. The > effect can be minimised by reducing the overall gain and by making > sure that the output register is not operated close to its maximum > signal capacity level. > > However, while working with high gains and relatively high output > signal levels we have found that the excess gain > can be as much as a factor of 2-3. Although we have not tested the > Texas instruments EMCCDs we would expect them in principle to work the > same way - although the details would of course be somewhat different. > > As an example, suppose you wish to use one of these devices in photon > counting mode. An individual electron that enters the multiplication > register will gradually experience gain and so the amount of charge along > this register will gradually be increasing. It is only with the last > relatively few gain pixels that the problem starts to become serious, > which probably means that there is additional scatter in the overall > gain. That gain disproportionately depends on a relatively small > number of pixels that have been operated with their gain voltage > effectively increased by an amount which depends on the noisy electron > multiplication process. > > We have modelled this effect and our Monte-Carlo models of the L3CCD > multiplication register confirm this, reproducing the observed > non-linearity at high signals. The simple assumption that the voltage > change in a pixel is proportional to the charge in that pixel gives a > model in good agreement with our observations. We also find that > provided we know about this effect and correct for it we can achieve > good photometric accuracy. We have measured magnitudes obtained with > an EMCCD operated at high gain looking at the core of a rich globular > cluster using Lucky > imaging methods. After correction using lab measurements of the > voltage/gain curve for the chip we find good agreement between our > data and that obtained by the Hubble space telescope. > > Best wishes, > > Nicholas Law & Craig Mackay > >------------------------------------------------------------------------ > > >-- CCD-world -- >CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >Standard replies will go to the list; address personal replies manually. >For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041005/09efe8af/attachment.html From k_smith at routes.com Tue Oct 5 17:06:39 2004 From: k_smith at routes.com (Ken Smith) Date: Tue, 05 Oct 2004 17:06:39 -0400 Subject: CCD-world: Fiber optic coupling to CCDs Message-ID: <41630CDF.6020206@routes.com> Hello CCD World: I am looking for information or a contact to obtain information on coupling imaging fibre (fiber) optics to CCDs (or even CMOS sensors). It could be a literature reference or a contact. Or if someone has on hand a tech note/memo on how it was done in the past that would be appreciated. There are probably a variations on how it is done, but at least one version would be a start. eg. how do you bring the two pieces togther to make contact. Otherwise we will have a situation where "several weeks in the lab frequently saves several hours in the library" (One of Murphy's Laws). Thanks, -- Ken Smith Director, Advanced Technology Routes AstroEngineering Ltd 303 Legget Drive Kanata, ON K2K 2B1 Canada Phone: 613-592-0748 x 107 Fax: 613-592-6553 Web: www.routes.com From cdm at ast.cam.ac.uk Wed Oct 6 04:47:57 2004 From: cdm at ast.cam.ac.uk (Craig Mackay) Date: Wed, 06 Oct 2004 09:47:57 +0100 Subject: CCD-world: EMCCD Gain feature. In-Reply-To: <4162C149.1040306@netscape.net> References: <41629759.7010502@ast.cam.ac.uk> <4162C149.1040306@netscape.net> Message-ID: <4163B13D.2020104@ast.cam.ac.uk> An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041006/651e2f05/attachment.html From gach at oamp.fr Wed Oct 6 04:28:44 2004 From: gach at oamp.fr (gach) Date: Wed, 6 Oct 2004 10:28:44 +0200 Subject: CCD-world: Fiber optic coupling to CCDs References: <41630CDF.6020206@routes.com> Message-ID: <000e01c4ab7e$81e8c080$86d4ddc3@portablejlg> Hi, we ha a CCD fiber coupled a few years ago by the proxitronics firm in germany. It was very cheap and done with very good quality regards ------------------------------------------------------------- Gach Jean-Luc Observatoire de Marseille 2, Place Le Verrier 13248 Marseille cedex 4 FRANCE phone : +33 (0)4 95 04 41 19 fax: +33 (0)4 91 62 11 90 http://www-obs.cnrs-mrs.fr/interferometrie/interferometrie.html ----- Original Message ----- From: "Ken Smith" To: Sent: Tuesday, October 05, 2004 11:06 PM Subject: CCD-world: Fiber optic coupling to CCDs > Hello CCD World: > > I am looking for information or a contact to obtain information on > coupling imaging fibre (fiber) optics to CCDs (or even CMOS sensors). It > could be a literature reference or a contact. Or if someone has on hand a > tech note/memo on how it was done in the past that would be appreciated. > There are probably a variations on how it is done, but at least one > version would be a start. eg. how do you bring the two pieces togther to > make contact. Otherwise we will have a situation where "several weeks in > the lab frequently saves several hours in the library" (One of Murphy's > Laws). > > > Thanks, > > -- > Ken Smith > Director, Advanced Technology > Routes AstroEngineering Ltd > 303 Legget Drive > Kanata, ON K2K 2B1 > Canada > > Phone: 613-592-0748 x 107 > Fax: 613-592-6553 > Web: www.routes.com > > > > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: > http://www.ctio.noao.edu/mailman/listinfo/ccd-world > From tleroux at eldim.fr Wed Oct 6 11:15:14 2004 From: tleroux at eldim.fr (Thierry LEROUX) Date: Wed, 6 Oct 2004 17:15:14 +0200 Subject: CCD-world: EMCCD Gain feature. Message-ID: <4952AC7937B9114EACAA5035A4F1B7214B4DDB@ZifNab.eldim.fr> Dear CCD world, << This effect has been recognized early during the design phase of Texas Instruments Charge Multiplying CCDs and minimized as described in the latest SPIE article. >> Would it be possible to get the exact reference of this article. The most we can understand advantages, limitations and inner details of EMCCDs, the more we can take profit of their advantages. With thanxs and regards, Thierry LEROUX ________________________________ From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu] On Behalf Of Jerry Sent: 05 October 2004 17:44 To: Optical & SWIR imager development for professional astronomy Subject: Re: CCD-world: EMCCD Gain feature. Dear CCD World. I would like to make a comment on this. "The sense of this is that the gain is increased by the presence of large amounts of signal. The overall effect is that the gain delivered by the multiplication register has a signal dependent component." Typically, the presence of charge in the CCD register lowers the field. This would normally cause a reduction of gain. This effect has been recognized early during the design phase of Texas Instruments Charge Multiplying CCDs and minimized as described in the latest SPIE article. "Although we have not tested the Texas instruments EMCCDs we would expect them in principle to work the same way - although the details would of course be somewhat different." Please do not make claims if you have not verified them by testing. Regards, Jerry Hynecek Consultant -------------------------------------- cdm at ast.cam.ac.uk wrote: Dear CCD-World, We have discovered an operational problem with EMCCDs that prospective users should be aware of. You will know that the gain of the multiplication register in these devices is adjusted by changing the amplitude of a high-voltage clock phase in the multiplication register. If you use the device with reasonably high gain then the gain is a strong function of this voltage, with 0.5 volts corresponding to a factor of as much as two or three at gains of several thousands with the devices from E2V. When working with a signal level that approaches the maximum that can be transferred efficiently the large signal affects the voltage on each electrode and therefore affects the gain of that electrode. The sense of this is that the gain is increased by the presence of large amounts of signal. The overall effect is that the gain delivered by the multiplication register has a signal dependent component. It is important that this effect is recognised and calibrated. The effect can be minimised by reducing the overall gain and by making sure that the output register is not operated close to its maximum signal capacity level. However, while working with high gains and relatively high output signal levels we have found that the excess gain can be as much as a factor of 2-3. Although we have not tested the Texas instruments EMCCDs we would expect them in principle to work the same way - although the details would of course be somewhat different. As an example, suppose you wish to use one of these devices in photon counting mode. An individual electron that enters the multiplication register will gradually experience gain and so the amount of charge along this register will gradually be increasing. It is only with the last relatively few gain pixels that the problem starts to become serious, which probably means that there is additional scatter in the overall gain. That gain disproportionately depends on a relatively small number of pixels that have been operated with their gain voltage effectively increased by an amount which depends on the noisy electron multiplication process. We have modelled this effect and our Monte-Carlo models of the L3CCD multiplication register confirm this, reproducing the observed non-linearity at high signals. The simple assumption that the voltage change in a pixel is proportional to the charge in that pixel gives a model in good agreement with our observations. We also find that provided we know about this effect and correct for it we can achieve good photometric accuracy. We have measured magnitudes obtained with an EMCCD operated at high gain looking at the core of a rich globular cluster using Lucky imaging methods. After correction using lab measurements of the voltage/gain curve for the chip we find good agreement between our data and that obtained by the Hubble space telescope. Best wishes, Nicholas Law & Craig Mackay ________________________________ -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041006/79c64461/attachment.html From jhynecek at netscape.net Wed Oct 6 13:12:18 2004 From: jhynecek at netscape.net (Jerry) Date: Wed, 06 Oct 2004 12:12:18 -0500 Subject: CCD-world: EMCCD Gain feature. In-Reply-To: <4163B13D.2020104@ast.cam.ac.uk> References: <41629759.7010502@ast.cam.ac.uk> <4162C149.1040306@netscape.net> <4163B13D.2020104@ast.cam.ac.uk> Message-ID: <41642772.1030607@netscape.net> Dear Craig Please elaborate in more detail on how lowering of the field increases the potential. In my experience with CCDs lowering the potential in the well by filling it with charge also lowers the field between the pixels. Of course, I am considering only buried channel CCD registers that all modern CCDs are using. In the surface channel CCDs the situation would be as you say, but if E2V is using surface channel registers, then the gain non-linearity would be the least of their problems. Detail characterization of the TI CCD has been published in SPIE Proceedings Electronic Imaging 19-21 January 2004 vol.5301, pp. 99-108. This is all I can offer at this time. Regards, Jerry Hynecek ----------------------------- cdm at ast.cam.ac.uk wrote: > Dear Jerry > > You are quite correct that the presence of charge lowers the field. > As a consequence the charges are accelerated through a larger > potential and therefor the gain is increased. > > The remark I make about the Texas instruments EMCCD is I think > accurate and fair. The single sentence makes it clear that I have not > tested those devices and that any effect would be different. If you > have any data that contradicts this then I am sure that this > discussion group would be pleased to be made aware of it. Equally if > you have the results of tests that show that there is no such issue > with your devices then that would also be extremely interesting. > > Although I have not tested the Texas Instruments device much yet I do > feel that it has a lot to offer partly because of the much higher > pixel rate it achieves, partly because of the much higher output > amplifier gain (as distinct from the multiplication register gain) and > partly because it uses a much lower voltage swing to achieve similar > gain levels. As a consequence any information about its use in photon > counting mode would be extremely interesting. The much higher output > amplifier gain means that even at high pixel rates the intrinsic > readout noise will be lower and therefore it should be possible to > achieve photon counting performance with significantly lower > modification register gains and therefore in a regime less likely to > be affected by multiplication register nonlinearities. Any > information that you have on this would be extremely interesting. > > Best wishes > > Craig Mackay > >> Dear CCD World. >> >> I would like to make a comment on this. >> >> "The sense of this is that the gain is increased by the presence of >> large amounts of signal. >> The overall effect is that the gain delivered by the multiplication >> register has a signal dependent component." >> >> Typically, the presence of charge in the CCD register lowers the >> field. This would normally cause a reduction of gain. This effect has >> been recognized early during the design phase of Texas Instruments >> Charge Multiplying CCDs and minimized as described in the latest SPIE >> article. >> >> "Although we have not tested the Texas instruments EMCCDs we would >> expect them in principle to work the same way - although the details >> would of course be somewhat different." >> >> Please do not make claims if you have not verified them by testing. >> >> Regards, >> Jerry Hynecek >> Consultant >> -------------------------------------- >> >> cdm at ast.cam.ac.uk wrote: >> >>> Dear CCD-World, >>> >>> We have discovered an operational problem with EMCCDs that >>> prospective users should be aware of. You will know that the gain >>> of the multiplication register in these devices is adjusted by >>> changing the amplitude of a high-voltage clock phase in the >>> multiplication register. If you use the device with reasonably high >>> gain then the gain is a strong >>> function of this voltage, with 0.5 volts corresponding to a factor >>> of as much as two or three at gains of several thousands with the >>> devices from E2V. When working with a signal level that approaches >>> the maximum that can be transferred efficiently the large signal >>> affects the voltage on each electrode and therefore affects the gain >>> of that electrode. The sense of this is that the gain is increased >>> by the presence of large amounts of signal. >>> >>> The overall effect is that the gain delivered by the multiplication >>> register has a signal dependent component. >>> >>> It is important that this effect is recognised and calibrated. The >>> effect can be minimised by reducing the overall gain and by making >>> sure that the output register is not operated close to its maximum >>> signal capacity level. >>> >>> However, while working with high gains and relatively high output >>> signal levels we have found that the excess gain >>> can be as much as a factor of 2-3. Although we have not tested the >>> Texas instruments EMCCDs we would expect them in principle to work >>> the same way - although the details would of course be somewhat >>> different. >>> >>> As an example, suppose you wish to use one of these devices in >>> photon counting mode. An individual electron that enters the >>> multiplication register will gradually experience gain and so the >>> amount of charge along >>> this register will gradually be increasing. It is only with the >>> last relatively few gain pixels that the problem starts to become >>> serious, which probably means that there is additional scatter in >>> the overall gain. That gain disproportionately depends on a >>> relatively small number of pixels that have been operated with their >>> gain voltage effectively increased by an amount which depends on the >>> noisy electron multiplication process. >>> >>> We have modelled this effect and our Monte-Carlo models of the L3CCD >>> multiplication register confirm this, reproducing the observed >>> non-linearity at high signals. The simple assumption that the >>> voltage change in a pixel is proportional to the charge in that >>> pixel gives a model in good agreement with our observations. We also >>> find that provided we know about this effect and correct for it we >>> can achieve good photometric accuracy. We have measured magnitudes >>> obtained with an EMCCD operated at high gain looking at the core of >>> a rich globular cluster using Lucky >>> imaging methods. After correction using lab measurements of the >>> voltage/gain curve for the chip we find good agreement between our >>> data and that obtained by the Hubble space telescope. >>> >>> Best wishes, >>> >>> Nicholas Law & Craig Mackay >>> >>>------------------------------------------------------------------------ >>> >>> >>>-- CCD-world -- >>>CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >>>Standard replies will go to the list; address personal replies manually. >>>For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world >>> >>> >>------------------------------------------------------------------------ >> >> >>-- CCD-world -- >>CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >>Standard replies will go to the list; address personal replies manually. >>For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world >> >> > >------------------------------------------------------------------------ > > >-- CCD-world -- >CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >Standard replies will go to the list; address personal replies manually. >For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041006/c41d1986/attachment.html From alb at vega.lpl.arizona.edu Wed Oct 6 19:14:30 2004 From: alb at vega.lpl.arizona.edu (Lyle Broadfoot) Date: Wed, 06 Oct 2004 16:14:30 -0700 Subject: CCD-world: Fiber optic coupling to CCDs In-Reply-To: <41630CDF.6020206@routes.com> References: <41630CDF.6020206@routes.com> Message-ID: <6.1.2.0.0.20041006160517.02884dc0@vega.lpl.arizona.edu> Ken: I was a pioneer in coupling CCDs and fiber optics and have coupled several dozen over the years. I have not seen a technical note on the subject. However, what can I do for you? Lyle At 02:06 PM 10/5/04, you wrote: >Hello CCD World: > >I am looking for information or a contact to obtain information on >coupling imaging fibre (fiber) optics to CCDs (or even CMOS sensors). It >could be a literature reference or a contact. Or if someone has on hand a >tech note/memo on how it was done in the past that would be >appreciated. There are probably a variations on how it is done, but at >least one version would be a start. eg. how do you bring the two pieces >togther to make contact. Otherwise we will have a situation where >"several weeks in the lab frequently saves several hours in the library" >(One of Murphy's Laws). > > >Thanks, > >-- >Ken Smith >Director, Advanced Technology >Routes AstroEngineering Ltd >303 Legget Drive >Kanata, ON K2K 2B1 >Canada > >Phone: 613-592-0748 x 107 >Fax: 613-592-6553 >Web: www.routes.com > > > > >-- CCD-world -- >CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >Standard replies will go to the list; address personal replies manually. >For more information, please go to: >http://www.ctio.noao.edu/mailman/listinfo/ccd-world A. Lyle Broadfoot alb at vega.lpl.arizona.edu University of Arizona Lunar and Planetary Laboratory 520-621-4303 Office Sonett Space Sciences Building 520-621-8364 Fax 1541 East University Boulevard 520-621-4155 Jen Evers Tucson, AZ 85721-0063 From gleeson at gv.net Tue Oct 12 13:22:32 2004 From: gleeson at gv.net (Greg Leeson) Date: Tue, 12 Oct 2004 09:22:32 -0700 Subject: CCD-world: OFF Resistance of CCD Reset Switch Message-ID: <416C04C8.5000403@gv.net> I need a sanity check here. In Chapter 6 of "Scientific Charge Coupled Devices" J. Janesick describes a simple method for measuring the OFF state resistance of the reset switch in a CCD. Equation 6.50b relates the OFF resistance to the change in voltage (dV), change in time (dt) and node sensitivity (Sv in volts/electron) as; Roff = (Vref*dt)/(dV*Sv*q) My own derivation places the Sv term in the numerator, not the denominator. This also makes the equation dimensionally correct. Am I missing something here or is equation 6.50b simply misprinted? Greg Leeson Consultant From CMOSCCD at aol.com Tue Oct 12 14:40:21 2004 From: CMOSCCD at aol.com (CMOSCCD at aol.com) Date: Tue, 12 Oct 2004 13:40:21 EDT Subject: CCD-world: OFF Resistance of CCD Reset Switch Message-ID: *************jj Greg, Yikes. . . . you are right !! Physically there is no such thing as Roff. The potential barrier height under the reset gate is enormous when off. . . by several volts. The average thermal energy of electrons is kT (25 mV at room temperature). The probability of a signal electron going over this barrier is next to zero including tunneling mechanisms. So. . reset Roff, and its relationship to signal electrons, is near infinite. To talk about something finite, Equation 6.50b defines Roff by the leakage current that builds on the sense node (i.e., thermal dark current and cosmic rays). Dark current comes from various sources in the vicinity of the sense node. . . . most having nothing to do with the reset MOSFET. So in effect, the equation is giving an Roff for the entire region.. . just not the reset switch. Thanks for the help and keeping things honest. . . Jim PS. . the CCD book needs a newer edition. There are, last count as of today :-), five equations that are dead wrong or include typos. ************jj In a message dated 10/12/2004 9:32:56 AM Pacific Standard Time, gleeson at gv.net writes: > I need a sanity check here. In Chapter 6 of "Scientific Charge Coupled > Devices" J. Janesick describes a simple method for measuring the OFF > state resistance of the reset switch in a CCD. Equation 6.50b relates > the OFF resistance to the change in voltage (dV), change in time (dt) > and node sensitivity (Sv in volts/electron) as; Roff = > (Vref*dt)/(dV*Sv*q) My own derivation places the Sv term in the > numerator, not the denominator. This also makes the equation > dimensionally correct. Am I missing something here or is equation 6.50b > simply misprinted? Greg Leeson Consultant > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041012/bccc938a/attachment.html From gregory at ll.mit.edu Tue Oct 12 15:20:14 2004 From: gregory at ll.mit.edu (Jim Gregory) Date: Tue, 12 Oct 2004 14:20:14 -0400 Subject: CCD-world: Semiconductor Processing Engineer Message-ID: Tim, Attached is an opening for a staff position at Lincoln Lab to work on fabricating advanced imagers. Please post it on CCD-World. Thanks. -Jim -------------- next part -------------- A non-text attachment was scrubbed... Name: Staff Semiconductor Process Scientist.doc Type: application/msword Size: 22016 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041012/e5edf1d9/attachment.doc From rsmith at astro.caltech.edu Thu Oct 21 12:40:28 2004 From: rsmith at astro.caltech.edu (Roger Smith) Date: Thu, 21 Oct 2004 08:40:28 -0700 Subject: CCD-world: Detector EE opening at Caltech Message-ID: <4177D86C.14987307@astro.caltech.edu> Dear CCD World, Caltech Optical Observatories is seeking an Electronics Engineer with significant relevant experience to augment its team working on wavefront sensor development for Adaptive Optics, testing of new detector control ASICs, characterization and optimization of large format NIR detectors and CCDs, and deployment of these technologies in a wide variety of astronomical instruments. We currently serve the Palomar, Keck, SNAP and 30m Telescopes. The job posting, CIT11770MB, may be found at http://www.recruitingcenter.net/clients/CalTech/publicjobs/CanGetJob.cfm?job_id=11770&esid=az&req=CIT11770MB I will be happy to provide more details to potential applicants. -- Roger Smith From rpmiller at umich.edu Fri Oct 22 17:22:16 2004 From: rpmiller at umich.edu (Ryan P. Miller) Date: Fri, 22 Oct 2004 16:22:16 -0400 Subject: CCD-world: Scientific CCDs Message-ID: <009001c4b874$daf25c10$9cc5d48d@RPMILLER> Hi Everyone, I worked on an interferometer project a few years back and we used a CCD from SITe. Now their phone is disconnected as is PixelVision's and email is returned, although the website (www.site-inc.com) is still active. Does anyone know what happened to SITe or know of other manufacturers of scientific CCDs that can eventually be used in space? Thanks! -------------------------------------------------------------------------- _____ _____ Ryan P. Miller (rpmiller at umich.edu) [ \/ ] University of Michigan | Michigan | Space Physics Research Laboratory | |\ /| | 1207 Space Research Bldg. [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 Ann Arbor MI 48109-2143 Fax: 734-763-5567 -------------------------------------------------------------------------- From dgeorge at cyanogen.com Mon Oct 25 12:04:01 2004 From: dgeorge at cyanogen.com (Douglas B. George) Date: Mon, 25 Oct 2004 11:04:01 -0400 Subject: CCD-world: Scientific CCDs In-Reply-To: <009001c4b874$daf25c10$9cc5d48d@RPMILLER> References: <009001c4b874$daf25c10$9cc5d48d@RPMILLER> Message-ID: <417D15E1.4000700@cyanogen.com> Ryan P. Miller wrote: > Hi Everyone, > > I worked on an interferometer project a few years back and we used a CCD > from SITe. Now their phone is disconnected as is PixelVision's and email is > returned, although the website (www.site-inc.com) is still active. Does > anyone know what happened to SITe or know of other manufacturers of > scientific CCDs that can eventually be used in space? Someone I know dropped by there a few weeks back. He said he found a notice from the Sherrif on the door... Might I suggest E2V? Doug ----------------------------------- Doug George dgeorge at cyanogen.com Diffraction Limited Makers of Cyanogen Imaging Products http://www.cyanogen.com 25 Conover Street Ottawa, Ontario, Canada, K2G 4C3 Phone: (613) 225-2732 Fax: (613) 225-9688 ----------------------------------- From jbeckers at eureca.de Mon Oct 25 05:28:19 2004 From: jbeckers at eureca.de (Juergen Beckers) Date: Mon, 25 Oct 2004 10:28:19 +0200 Subject: CCD-world: Scientific CCDs References: <009001c4b874$daf25c10$9cc5d48d@RPMILLER> Message-ID: <417CB923.38D031E2@eureca.de> Dear Mr. Miller, the question regarding the destiny of SITe is indeed very interesting. We have also tried to reach them without success. If you should receive any new information about SITe, please Perhaps you can also use sensors from Faichild Imaging. These manufacturer supplies high quality CCD sensors also for space applications. Please take a look at: http://www.fairchildimaging.com EURECA Messtechnik is the german representative of Fairchild Imaging. We can give you technical support for all products of Fairchild Imaging. Do not hesitate to contact me with further questions regarding this topic. Best regrads Juergen Beckers "Ryan P. Miller" wrote: > Hi Everyone, > > I worked on an interferometer project a few years back and we used a CCD > from SITe. Now their phone is disconnected as is PixelVision's and email is > returned, although the website (www.site-inc.com) is still active. Does > anyone know what happened to SITe or know of other manufacturers of > scientific CCDs that can eventually be used in space? > > Thanks! > > -------------------------------------------------------------------------- > _____ _____ Ryan P. Miller (rpmiller at umich.edu) > [ \/ ] University of Michigan > | Michigan | Space Physics Research Laboratory > | |\ /| | 1207 Space Research Bldg. > [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 > Ann Arbor MI 48109-2143 Fax: 734-763-5567 > -------------------------------------------------------------------------- > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -- J?rgen Beckers Tel: +49 700 387322-33 EURECA Messtechnik GmbH Fax: +49 700 387322-329 Eupener Strasse 150 http://www.eureca.de 50933 K?ln, GERMANY beckers at eureca.de -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041025/ba7ff495/attachment.html From Ralph.Holtom at e2v.com Mon Oct 25 07:24:02 2004 From: Ralph.Holtom at e2v.com (Holtom, Ralph) Date: Mon, 25 Oct 2004 11:24:02 +0100 Subject: CCD-world: Scientific CCDs Message-ID: <4F826F960057D4118EC3009027E245380A1074D4@whl17.e2v.com> It would have been nicer if someone else had answered this, but you will find that e2v has a great deal of experience in making scientific CCDs that get used both terrestrially and in space. Visit us: http://www.e2v.com/introduction/prod_ccd.htm?from=front_drop You will find that your department has been in contact with Pete Fochi (Peter.fochi at e2vtechnologies-na.com) at our New York office for a while so give him or me a call. Regards Ralph Holtom Dr Ralph Holtom CCD Business Manager -----Original Message----- From: Ryan P. Miller [mailto:rpmiller at umich.edu] Sent: 22 October 2004 21:22 To: CCD-world at ctio.noao.edu Subject: CCD-world: Scientific CCDs Hi Everyone, I worked on an interferometer project a few years back and we used a CCD from SITe. Now their phone is disconnected as is PixelVision's and email is returned, although the website (www.site-inc.com) is still active. Does anyone know what happened to SITe or know of other manufacturers of scientific CCDs that can eventually be used in space? Thanks! -------------------------------------------------------------------------- _____ _____ Ryan P. Miller (rpmiller at umich.edu) [ \/ ] University of Michigan | Michigan | Space Physics Research Laboratory | |\ /| | 1207 Space Research Bldg. [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 Ann Arbor MI 48109-2143 Fax: 734-763-5567 -------------------------------------------------------------------------- -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From earl.aamodt at lmco.com Mon Oct 25 14:25:58 2004 From: earl.aamodt at lmco.com (Aamodt, Earl) Date: Mon, 25 Oct 2004 10:25:58 -0700 Subject: CCD-world: Scientific CCDs Message-ID: <1390769DE1E82B47945A65273915BB3306F9E41A@emss01m15.us.lmco.com> STA also produces CCDs for Space flight applications. Their website is http://www.sta-inc.net. Earl __________________________________ Earl Aamodt Space Instrumentation Group Leader Space Physics Laboratory Lockheed Martin Advanced Technology Center Phone: 650-424-3280 Fax: 650-424-3333 Cell: 650-424-3280 Email: earl.aamodt at lmco.com -----Original Message----- From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu] On Behalf Of Ryan P. Miller Sent: Friday, October 22, 2004 1:22 PM To: CCD-world at ctio.noao.edu Subject: CCD-world: Scientific CCDs Hi Everyone, I worked on an interferometer project a few years back and we used a CCD from SITe. Now their phone is disconnected as is PixelVision's and email is returned, although the website (www.site-inc.com) is still active. Does anyone know what happened to SITe or know of other manufacturers of scientific CCDs that can eventually be used in space? Thanks! ------------------------------------------------------------------------ -- _____ _____ Ryan P. Miller (rpmiller at umich.edu) [ \/ ] University of Michigan | Michigan | Space Physics Research Laboratory | |\ /| | 1207 Space Research Bldg. [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 Ann Arbor MI 48109-2143 Fax: 734-763-5567 ------------------------------------------------------------------------ -- -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From craig at nso.edu Mon Oct 25 18:08:21 2004 From: craig at nso.edu (Craig Gullixson) Date: Mon, 25 Oct 2004 15:08:21 -0600 (MDT) Subject: CCD-world: Scientific CCDs Message-ID: <200410252108.i9PL8Ltr003197@mailhost.nso.edu> >From: ccd-world-bounces at ctio.noao.edu >[mailto:ccd-world-bounces at ctio.noao.edu] On Behalf Of Ryan P. Miller >Sent: Friday, October 22, 2004 1:22 PM >To: CCD-world at ctio.noao.edu >Subject: CCD-world: Scientific CCDs > > >Hi Everyone, > >I worked on an interferometer project a few years back and we used a CCD >from SITe. Now their phone is disconnected as is PixelVision's and >email is returned, although the website (www.site-inc.com) is still >active. Does anyone know what happened to SITe or know of other >manufacturers of scientific CCDs that can eventually be used in space? > >Thanks! > >------------------------------------------------------------------------ >-- > _____ _____ Ryan P. Miller (rpmiller at umich.edu) > [ \/ ] University of Michigan > | Michigan | Space Physics Research Laboratory > | |\ /| | 1207 Space Research Bldg. > [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 > Ann Arbor MI 48109-2143 Fax: 734-763-5567 >------------------------------------------------------------------------ >-- > > >-- CCD-world -- >CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu >Standard replies will go to the list; address personal replies manually. >For more information, please go to: >http://www.ctio.noao.edu/mailman/listinfo/ccd-world I mentioned this message to my supervisor this morning and he replied that we had in fact been contacted by someone from PixelVision just last week. We were somewhat surprised as we have known that the door has been locked for some time and it was our understanding that at least PixelVision had gone bankrupt. Anyway, my supervisor called them back and the story he got was yes, there have been some difficulties, however they were calling former customers to see if they could do anything for them. Apparently the goal of these queries was to see if there was enough interest to get their investors to start up operations again. ________________________________________________________________________ Craig A. Gullixson Instrument Engineer INTERNET: cgullixson at nso.edu National Solar Observatory/Sac. Peak PHONE: (505) 434-7065 Sunspot, NM 88349 USA FAX: (505) 434-7029 From k_smith at routes.com Mon Oct 25 18:39:28 2004 From: k_smith at routes.com (Ken Smith) Date: Mon, 25 Oct 2004 17:39:28 -0400 Subject: CCD-world: Dalsa CCD In-Reply-To: <200410252108.i9PL8Ltr003197@mailhost.nso.edu> References: <200410252108.i9PL8Ltr003197@mailhost.nso.edu> Message-ID: <417D7290.1000303@routes.com> Hello: I am wishing to find out if there is anyone who knows about the Dalsa FTT1010M CCD, 1024 x 1024 pixels, frame transfer. Dalsa purchased the production line from Philips in The Netherlands a couple of years ago, so it may have been known as a different part number before. I am interested in it's low dark current and high readout speed. Does anyone have any experience with this device ? Is it as advertised in the data sheet and application notes ? Was there any trouble in getting this CCD ? Are there commercial systems that use this device ? Are there any papers written about testing of this CCD ? Were there any problems with it ? Thanks, -- Ken Smith Director, Advanced Technology Routes AstroEngineering Ltd 303 Legget Drive Kanata, ON K2K 2B1 Canada Phone: 613-592-0748 x 107 Fax: 613-592-6553 Web: www.routes.com From kossov at silar.spb.ru Tue Oct 26 04:49:55 2004 From: kossov at silar.spb.ru (Kossov) Date: Tue, 26 Oct 2004 11:49:55 +0400 Subject: CCD-world: Scientific CCDs In-Reply-To: <009001c4b874$daf25c10$9cc5d48d@RPMILLER> Message-ID: Dear Mr. Miller, You can look at Dalsa Inc. (Canada). They produce image sensors for spaceborne applications. Their web site is www.dalsa.com. I know their research staff member Mr. Leonid Lazovsky (mailto:leonid.lazovsky at dalsa.com). I can also suggest you to look at the products of two Russian companies - Electron Optronic and Silar Ltd. (http:// www.silar.spb.ru). Regards, Vladimir Kossov Electron Optronic 68 pr. Morisa Toreza, St. Petersburg 194223 Russia Phone: +7-812-552-5754, +7-812-552-2069 Fax: +7-812-552-2876 mailto:v.kossov at mail.ru http://www.silar.spb.ru > -----Original Message----- > From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu] On > Behalf Of Ryan P. Miller > Sent: Saturday, October 23, 2004 12:22 AM > To: CCD-world at ctio.noao.edu > Subject: CCD-world: Scientific CCDs > > Hi Everyone, > > I worked on an interferometer project a few years back and we used a CCD > from SITe. Now their phone is disconnected as is PixelVision's and email is > returned, although the website (www.site-inc.com) is still active. Does > anyone know what happened to SITe or know of other manufacturers of > scientific CCDs that can eventually be used in space? > > Thanks! > > ------------------------------------------------------------------------ -- > _____ _____ Ryan P. Miller (rpmiller at umich.edu) > [ \/ ] University of Michigan > | Michigan | Space Physics Research Laboratory > | |\ /| | 1207 Space Research Bldg. > [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 > Ann Arbor MI 48109-2143 Fax: 734-763-5567 > ------------------------------------------------------------------------ -- > > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From lesser at itl.arizona.edu Tue Oct 26 12:37:27 2004 From: lesser at itl.arizona.edu (Michael Lesser) Date: Tue, 26 Oct 2004 08:37:27 -0700 Subject: CCD-world: CCDs Message-ID: <09958048C4B41F49A5E6A7BE1DCC40FB0735E8@star.itl.arizona.edu> Hi Folks, We have recently seen nice scientific CCDs from the following companies (in alphabetical order!): DALSA, http://www.dalsa.com E2V, http://e2vtechnologies.com Fairchild Imaging, http://www.fairchildimaging.com/main/index.htm Imager Labs, http://www.imagerlabs.com Kodak, http://www.kodak.com/global/en/digital/ccd Semiconductor Technology Associates, http://www.sta-inc.net -Mike Michael Lesser, Ph.D. Research Professor University of Arizona Imaging Technology Laboratory 325 S. Euclid Ave., Suite 117 Tucson, AZ 85721 (520) 621-4236 (520) 628-2859 FAX mlesser at as.arizona.edu From Peter.Pool at e2v.com Tue Oct 26 14:55:45 2004 From: Peter.Pool at e2v.com (Pool, Peter) Date: Tue, 26 Oct 2004 18:55:45 +0100 Subject: CCD-world: CCDs Message-ID: <4F826F960057D4118EC3009027E245380D54AB97@whl17.e2v.com> Hi, May I suggest that will get a better response with a www before e2vtechnologies.com. Since we floated as an independent company on the London stock exchange you can, more conveniently, also find us at http://www.e2v.com Regards Peter Pool CCD Chief Engineer e2v Technologies 'phone +44(0)1245 45 3570 peter.pool at e2v.com -----Original Message----- From: Michael Lesser [mailto:lesser at itl.arizona.edu] Sent: 26 October 2004 16:37 To: CCD-world at ctio.noao.edu Subject: CCD-world: CCDs Hi Folks, We have recently seen nice scientific CCDs from the following companies (in alphabetical order!): DALSA, http://www.dalsa.com E2V, http://e2vtechnologies.com Fairchild Imaging, http://www.fairchildimaging.com/main/index.htm Imager Labs, http://www.imagerlabs.com Kodak, http://www.kodak.com/global/en/digital/ccd Semiconductor Technology Associates, http://www.sta-inc.net -Mike Michael Lesser, Ph.D. Research Professor University of Arizona Imaging Technology Laboratory 325 S. Euclid Ave., Suite 117 Tucson, AZ 85721 (520) 621-4236 (520) 628-2859 FAX mlesser at as.arizona.edu -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From gilmore at ucolick.org Tue Oct 26 20:16:13 2004 From: gilmore at ucolick.org (Kirk Gilmore) Date: Tue, 26 Oct 2004 16:16:13 -0700 Subject: CCD-world: CCDs References: <09958048C4B41F49A5E6A7BE1DCC40FB0735E8@star.itl.arizona.edu> Message-ID: <417EDABD.7FEE13DD@ucolick.org> Lest we forget the outstanding devices we put in Hires we got from MIT-LL that have QE >90% at 3500A. (coated by Mike Lesser, of course) Kirk Gilmore Michael Lesser wrote: > Hi Folks, > > We have recently seen nice scientific CCDs from the following companies > (in alphabetical order!): > > DALSA, http://www.dalsa.com > > E2V, http://e2vtechnologies.com > > Fairchild Imaging, http://www.fairchildimaging.com/main/index.htm > > Imager Labs, http://www.imagerlabs.com > > Kodak, http://www.kodak.com/global/en/digital/ccd > > Semiconductor Technology Associates, http://www.sta-inc.net > > -Mike > > Michael Lesser, Ph.D. > Research Professor > University of Arizona > Imaging Technology Laboratory > 325 S. Euclid Ave., Suite 117 > Tucson, AZ 85721 > (520) 621-4236 > (520) 628-2859 FAX > mlesser at as.arizona.edu > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world From gregory at ll.mit.edu Wed Oct 27 12:38:24 2004 From: gregory at ll.mit.edu (Jim Gregory) Date: Wed, 27 Oct 2004 11:38:24 -0400 Subject: CCD-world: CCD Imager Test Engineer Message-ID: Tim, Attached is an opening for a staff position at Lincoln Lab to work on testing advanced imagers. Please post it on CCD-World. Thanks. -Jiim -------------- next part -------------- A non-text attachment was scrubbed... Name: Device_Test.doc Type: application/msword Size: 23040 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041027/33f67638/attachment.doc From rpmiller at umich.edu Wed Oct 27 13:21:14 2004 From: rpmiller at umich.edu (Ryan P. Miller) Date: Wed, 27 Oct 2004 12:21:14 -0400 Subject: CCD-world: Scientific CCDs Message-ID: <01db01c4bc40$faa0af60$9cc5d48d@RPMILLER> Thanks to everyone for their input regarding sources for Scientific CCDs. It appears that SITe and PixelVision are indeed out of business. However, you all gave me lots of other options to persue. Thanks again, Ryan -------------------------------------------------------------------------- _____ _____ Ryan P. Miller (rpmiller at umich.edu) [ \/ ] University of Michigan | Michigan | Space Physics Research Laboratory | |\ /| | 1207 Space Research Bldg. [____]\/[____] 2455 Hayward St. Phone: 734-763-5373 Ann Arbor MI 48109-2143 Fax: 734-763-5567 -------------------------------------------------------------------------- From tg.burke at ngc.com Wed Oct 27 08:00:07 2004 From: tg.burke at ngc.com (Burke, Thomas G.) Date: Wed, 27 Oct 2004 07:00:07 -0400 Subject: CCD-world: CCDs Message-ID: Not to instigate a war, but the last time we looked at MIT devices, they wanted all the NRE to do a ground-up design, as they didn't really fully document everything & archive it in a manner that allowed a repro run. -Tom -----Original Message----- From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu]On Behalf Of Kirk Gilmore Sent: Tuesday, October 26, 2004 7:16 PM To: Optical & SWIR imager development for professional astronomy Subject: Re: CCD-world: CCDs Lest we forget the outstanding devices we put in Hires we got from MIT-LL that have QE >90% at 3500A. (coated by Mike Lesser, of course) Kirk Gilmore Michael Lesser wrote: > Hi Folks, > > We have recently seen nice scientific CCDs from the following companies > (in alphabetical order!): > > DALSA, http://www.dalsa.com > > E2V, http://e2vtechnologies.com > > Fairchild Imaging, http://www.fairchildimaging.com/main/index.htm > > Imager Labs, http://www.imagerlabs.com > > Kodak, http://www.kodak.com/global/en/digital/ccd > > Semiconductor Technology Associates, http://www.sta-inc.net > > -Mike > > Michael Lesser, Ph.D. > Research Professor > University of Arizona > Imaging Technology Laboratory > 325 S. Euclid Ave., Suite 117 > Tucson, AZ 85721 > (520) 621-4236 > (520) 628-2859 FAX > mlesser at as.arizona.edu > > -- CCD-world -- > CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu > Standard replies will go to the list; address personal replies manually. > For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -- CCD-world -- CCD-world is fully moderated. Send posts to CCD-world at ctio.noao.edu Standard replies will go to the list; address personal replies manually. For more information, please go to: http://www.ctio.noao.edu/mailman/listinfo/ccd-world -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041027/7a371c02/attachment.html From brianc at site-inc.com Thu Oct 28 22:31:56 2004 From: brianc at site-inc.com (brianc at site-inc.com) Date: Thu, 28 Oct 2004 21:31:56 -0400 Subject: CCD-world: Where is SITe Message-ID: There are a number of rumors about SITe and PixelVision. At this time the reports of SITe's demise may be premature. SITe is still in existence with a limited number of employees, and is reviewing its options to determine the direction for the future. Brian Corrie General Manager SITe/PixelVision brianc at site-inc.com From lricci at applieddata.net Mon Nov 1 10:35:43 2004 From: lricci at applieddata.net (Ricci, Larry) Date: Mon, 1 Nov 2004 08:35:43 -0500 Subject: CCD-world: 2K by 2K IR Sensors Message-ID: I am looking at a light weight (100 gram) system to do IR from the air - UAV pointed own or balloon pointed up. A new Intel CPU chip has a 2Kx2K image register- can anyone suggest a image sensor? Because of the moving platform, this would typically favor fast exposure times vs. long integration times Lawrence (Larry) Ricci Business Development 301-490-4007 x125 Applied Data Systems - www.applieddata.net An ISO 9001:2000 Registered Company Microsoft WEP Gold-level Member -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041101/176c4e5c/attachment.html From tg.burke at ngc.com Mon Nov 1 14:48:06 2004 From: tg.burke at ngc.com (Burke, Thomas G.) Date: Mon, 1 Nov 2004 12:48:06 -0500 Subject: CCD-world: 2K by 2K IR Sensors Message-ID: You could always consider a relatively inexpensiveline scanner (e.g. a bump-on to a CCD-style readout - I've seen these available from a couple of vendors) combined with a few TDI stages... -Tom -----Original Message----- From: ccd-world-bounces at ctio.noao.edu [mailto:ccd-world-bounces at ctio.noao.edu]On Behalf Of Ricci, Larry Sent: Monday, November 01, 2004 8:36 AM To: ccd-world at ctio.noao.edu Subject: CCD-world: 2K by 2K IR Sensors I am looking at a light weight (100 gram) system to do IR from the air - UAV pointed own or balloon pointed up. A new Intel CPU chip has a 2Kx2K image register- can anyone suggest a image sensor? Because of the moving platform, this would typically favor fast exposure times vs. long integration times Lawrence (Larry) Ricci Business Development 301-490-4007 x125 Applied Data Systems - www.applieddata.net An ISO 9001:2000 Registered Company Microsoft WEP Gold-level Member -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041101/452f2927/attachment.html From cdm at ast.cam.ac.uk Fri Nov 5 10:51:15 2004 From: cdm at ast.cam.ac.uk (Craig Mackay) Date: Fri, 05 Nov 2004 13:51:15 +0000 Subject: CCD-world: EMCCD Linearity questions Message-ID: <418B8553.5090705@ast.cam.ac.uk> Dear CCD World I recently circulated some evidence that we thought we had of nonlinearities in L3CCDs from E2V Technologies which we were using for astronomy. The sense of the nonlinearities was that we saw an increase in gain as we approached saturation. Following comments from Jerry Hynecek, and others at E2V we have looked at this again. Detailed measurements by Ben Hadwen at E2V confirm Jerry's reaction that the gain nonlinearities should be small and should be of the opposite sense to what we believed we had found, so that the multiplication gain should reduce slightly as saturation is approached. The detailed tests suggest that this would not be noticeable unless one was working both at very high gain, well in excess of 1000 at the same time as with signal levels that were approaching the saturation level of the output register. Our results were derived from a comparison of photometric measurements we had made on a globular cluster with measurements made on the Hubble space telescope (pre-COSTAR) which we believe to be good. Having made a number of additional checks on our instrument we find that there is no evidence at all for significant nonlinearities that can be attributed to the CCD or a camera system but there are now some reasons to believe that the Hubble data which we were using was not as reliable as we believed it was. The net effect is that users and potential users of CCDs with electron multiplying capability will not generally see any gain nonlinearities unless they are working at very high gains such as might be used in photon counting applications with signal levels that bring the output gain register close to saturation. I am sorry if my previous message has led to some confusion amongst users. I can confirm, nevertheless, that my enthusiasm for these detectors continues undiminished. Best wishes Craig Mackay. From sdelcham at ball.com Fri Nov 5 13:49:52 2004 From: sdelcham at ball.com (Delchamps, Suzanne) Date: Fri, 5 Nov 2004 09:49:52 -0700 Subject: CCD-world: Job Postings Message-ID: <5BB5C07FD9C2014C9F5CBB736BB594FF5AFFDD@AEROMSG2.AERO.BALL.COM> Please post the following jobs on your web site. Feel free to contact me if you have any questions. Thank you! Suzanne S. Delchamps Recruiter/College Relations Coordinator Ball Aerospace & Technologies Corp. Broomfield, CO 80021 (303) 533-4270 (800) 678-9030 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041105/148013e0/attachment.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Engineer Principal, Focal Plane.doc Type: application/msword Size: 33280 bytes Desc: Engineer Principal, Focal Plane.doc Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041105/148013e0/attachment.doc -------------- next part -------------- A non-text attachment was scrubbed... Name: Staff Consultant, Focal Plane.doc Type: application/msword Size: 33280 bytes Desc: Staff Consultant, Focal Plane.doc Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/20041105/148013e0/attachment-0001.doc From rsmith at astro.caltech.edu Sat Nov 13 04:19:47 2004 From: rsmith at astro.caltech.edu (Roger Smith) Date: Fri, 12 Nov 2004 23:19:47 -0800 Subject: CCD-world: How many e- from Fe55/Cd109 xray absorbtion in HgCdTe? Message-ID: <4195B593.EDB646F1@astro.caltech.edu> Folks, We have been finding that we get widely differing estimates of inverse gain (e-/ADU) from photon transfer curves on a HAWAII-2RG, depending on whether we use spatial statistics to estimate the noise (stddev in a subarray, after differencing two images of identical intensity), or temporal statistics (independent stddevs for each pixel looking through a stack of images having the same exposure time). The latter is of course the correct method since there is a broad distribution of gains and offsets from pixel to pixel in a multiplexed array. We are effectively measuring a separate varaiance curve for each pixel. Using temporal statistics, we are working our way up to measurements utilizing larger and larger numbers of frames, to check for repeatability. We can document how the gain histogram steadily narrows, as expected. We also see the modal gain increase with number of samples. Could somebody who please explain the latter to me! We would like ot be able to crosscheck our gain measurement using Xray events. This was been discussed on CCD World in late 2002 and mid 2003, but nobody offered a definitive recipe. I would be interested in hearing about any first hand experience. Has anyone