From ATWOOD at mps.ohio-state.edu Fri Oct 2 10:19:08 1998 From: ATWOOD at mps.ohio-state.edu (ATWOOD@mps.ohio-state.edu) Date: Thu Jul 29 11:54:35 2004 Subject: to zif or not to zif this is the question In-Reply-To: "Your message dated Thu, 01 Oct 1998 15:44:58 +0000" Message-ID: <01J2HNIT8UDK8WWZCO@mps.ohio-state.edu> Posted to CCD-world: -+-+-+- I have never used a socket on a CCD. Why subject the detector to the stress produced by the differential CTE between the plastics in a socket and the, generally low, CTEs of the package material. I use flying leads with machined pin sockets, Augat, on AWG 30 teflon wire. No stress at all on the CCD. I does take a few minutes to install all the leads, perhaps 10 for an 80 pin device, and another 5 to double check. WRT H2O in the dewar. The H2O is comming out of the oxide layers on the interior of the dewar. Yes, it takes weeks for this to pump out. Adding a small amount of molecular seive to the dewar, either warm or cold, will effectivly pump water vapor. The seive must be prepared by baking at 350 C though it can then be stored indefinitly in a metal can. For a new dewar of the IR labs size a 10 gm charge is pleanty and it should be changed once, after a few weeks with the dewar warm, to remove the water from the system. If the seive is held near LN2 temperature it will also pump the O2 and N2 that are always blowing through the o-rings into the dwar. Don't waste your money on a turbo pump. Don't waste your time pumping for weeks, let some seive do it for you for ( almost) free. It is convenient to have a small port through which to change the seive without disturbing the detector or wiring. The holes in the seive container should be covered with filter paper to keep dust off your irreplaceable detector and window. cheers -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From geary at cfa.harvard.edu Fri Oct 2 08:57:13 1998 From: geary at cfa.harvard.edu (John Geary) Date: Thu Jul 29 11:54:35 2004 Subject: goodbye to ZIF for EEV 42s Message-ID: <199810021157.HAA21904@jupiter.harvard.edu> Posted to CCD-world: -+-+-+- We have seen both breakage of the ZIF slider and bending at the cam point. Both result in no contact or unreliable contact at low temperatures. I am tending toward different solutions: 1. LIF socket, made out of two sections of DIN connector, milled and epoxied together in a 8 X 6 pin pattern. This seems to work fine, even when temperature cycled several times, but has the drawback that it can be shaken loose by a sufficiently hard knock to the dewar (not that this has *ever* happened to one of our dewars at the telescope !). 2. HIF (high insertion force) socket, cut from normal PGA stock. We punch out the unused pins and put a small screw thru where EEV has their cam, to facilitate insertion and extraction. Cannot fall off. We will probably built a small tool to allow gentle but firm extraction. --J. Geary -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From pcm at ing.iac.es Fri Oct 2 10:47:48 1998 From: pcm at ing.iac.es (Peter Moore) Date: Thu Jul 29 11:54:35 2004 Subject: to zif or not to zif this is the question In-Reply-To: Message-ID: Posted to CCD-world: -+-+-+- Dear Dan, I commend your reluctance to use zif sockets and research alternative ways to solve this common problem. Personally I feel that the less 'plastic' there is inside the vacuum space, the better the reliability and the cleaner the enviroment. I have never had the opportunity to experiment in this area but suggest that the sprung contacts used for pcb probing might make an excelent detector pin connector. These devices (available from your local rs store :-) are gold coated, bronze telescoping cylinders with a helical spring inside to provide force in making contact to solder pads on pcb's under test. They are available with serrated cup heads that would mate to the bottom of the detector pins and allow z axis travel to absorb the tolerence of the pins and allow the detector to be seated to a reference plane. The disadvantage would be that a 'top down' retaining clamp would be needed to hold the detector against the reference plane and conteract the total pin loading from the sprung contacts. The main unknown is whether the spring force would degrade with 'low' temperature. Hope this may help, Peter. =+===+===+===+===+===+===+===+===+ ING +===+===+===+===+===+===+===+= = Peter Moore, Isaac Newton Group, La Palma Observatory, Spain. = = E-mail pcm@ing.iac.es Voice Office +34 922 405566 = = S-mail Apartado de Correo 321, Fax Office +34 922 405646 = = 38780 Santa Cruz de La Palma, Voice Home +34 922 435042 = = Canary Islands, Spain. = =+===+===+===+===+===+===+===+===+ LPO +===+===+===+===+===+===+===+= -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mckenna at cfht.hawaii.edu Thu Oct 1 16:44:58 1998 From: mckenna at cfht.hawaii.edu (DAN MCKENNA) Date: Thu Jul 29 11:54:35 2004 Subject: to zif or not to zif this is the question Message-ID: Posted to CCD-world: -+-+-+- Hello CCD world, We are having a bit of trouble getting our EEV ccd42-90 on the sky. We have integrated the device and have run it with very promising results. Unfortunately the ZIF socket which is a cut down 3M zif failed and we are not able to find a ZIF that meets our needs so far. I have done a little research and wish share my findings to see if anyone has ideas or comments. On examining the ZIF under the microscope it was clear that the failure was due to cam actuation force being applied to a small area . This caused the slider to crack in half. In addition it appears that the cam itself was removing material even though the cam was smooth and with out any sharp edges. I have looked into modifying the slider drive to use an external drive screw on a small metal bar so that the force is distributed over the entire length of the slider (17mm) but it appears to be to much of a risk to try to put into practice. In doing a inter net search for zif sockets I found that a standard commercial zif used for Pentium has a durability rating of 50 mechanical cycles and 25 thermal shocks. A thermal shock was defined to be from +105c to -55 c. It appears that the number of thermal cycles is an issue. A typical ccd cooling cycle +20c to -110c or so is close to the shock range but it seems that a ccd cooling cycle has a much smaller time derivative i.e. slower than a dip shock. The thermal shock tests I have witnessed where done by dipping the parts into a hot and cold bath. A few of the sockets had a thermal shock rating of eight cycles and is indicative of the wide range of quality available. The CCD 42-90 does not have the pin count of a Pentium in fact it has 40 pins 0.5mm in diameter by 5 mm in length which makes me think that a ZIF socket is not necessary. It appears that the materials that 3M uses in the zif sockets have a tendency to absorb water. The worst material is polyether Sulfone at .34% for 24 hours at 73F and the best is Polyphenylene Sulified at .02%. I assume the % is by weight. When I prepare a dewar I use a turbo pump with a SRS 200 R.G.A in order to determine when to stop pumping. Usually the major species in the dewar is water vapor. It can some times take days to get the partial pressure down to 10^-6 Torr with the cold can at +80C and the dewar shell at +55C. Although a dewar with one device could be pumped down in a reasonable time a camera with several devices i.e. MegaCam with 42 devices might slow the process way down. These considerations are leading me down the path of a non zif socket using low insertion force contacts. Some of the sockets I have looked at have a force of 28 grams per pin so that a 40 pin device would take 1.12 KG of force, a reasonable amount. The socket will be constrained in Z to prevent the "thermal walk" and allow limited (1mm) travel so that the socket is not over constrained by the ccd which has a separate mechanical/thermal mount. Does anyone have any guidance for me ? Thank you for taking the time to read this. Dan McKenna CFHT mckenna@cfht.hawaii.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From apo at tightfit.demon.co.uk Thu Oct 1 15:12:21 1998 From: apo at tightfit.demon.co.uk (AlasaMorph) Date: Thu Jul 29 11:54:35 2004 Subject: The RGO Message-ID: Posted to CCD-world: -+-+-+- CLOSURE OF THE RGO AND ITS IMPLICATIONS --------------------------------------- As some of you may recall the RGO is closing and all staff are either re-locating, moving to new carreers, or are taking early retirement. The machines which support our technical services will be switched off at the end of September. THIS WEEK.... The main RGO web pages are hosted on these machines and so these pages will terminate in the next few days. The CCD Web pages are hosted on the main Starlink cluster at the Institute of Astronomy and hence will not close at this stage. However, I formally terminate my employment with RGO on November 4th and the ruling is that all Starlink accounts WILL terminate 1 month from that date. The CCD web pages, hosted at www.ast.cam.ac.uk/~apo/docs/ccds.html will therefore close - no later than the end of November. I have already placed a message on the CCD main web page to this effect. It has been and excrutiatingly difficult time during the last year or so. The rather ponderous way in which the RGO closure has proceeded hasnt helped morale one bit.... This along with the bad decision which was taken in the 1st place has made it even worse. The building is being finally cleared - all official RGO work ceases at the end of Septembe - THIS WEEK. All detector R/D capabilty has now been re-located to PPARC's ATC (Astronomy Technology Centre) in Edinburgh and they will now proceed with PPARC programme. Thank you for your valued support and interest in our work.. and in the many comments I have had over the years on the rather unique approach to Web Page Design... and all because, in 1965, I watched an awe inspiring new programme from the United States called Star Trek, and the Trek goes on... Live Long and Prosper Paddy -- ...Surfing in CyberSpace on the Wings of a Storm... | Email : apo@tightfit.demon.co.uk Web : www.tightfit.demon.co.uk/Images.html _/_/_/ _/_/ _/_/_/ _/_/_/ _/ _/ | _/ _/ _/ _/ _/ _/ _/ _/ _/_/ | _/_/_/ _/_/_/ _/ _/ _/ _/ _/ | _/ _/ _/ _/ _/ _/ _/ _/ | _/ _/ _/_/_/_/_/ _/_/_/_/ _/ | --------------------------------------------------------/ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MLCRONJE at firga.sun.ac.za Thu Oct 1 15:33:17 1998 From: MLCRONJE at firga.sun.ac.za (ML CRONJE [M.ING E&E]) Date: Thu Jul 29 11:54:35 2004 Subject: Dichroic filters for the KLI6003 Message-ID: Posted to CCD-world: -+-+-+- Dear CCD Friends The RGB organic filters of the KLI-6003/8013 devices become transparent beyond 750nm, limiting their application to remote sensing. These sensors can be purchased with taped-on-coverglass without filters. I have heard that several people have placed separately manufactured dichroic filters on top of the three linear arrays by removing the coverglass. I just want to know who have done it and what were the results. Regards Thys Cronje _______________________________ Imaging Systems Engineer Electronic Systems Laboratory University of Stellenbosch South Africa mlcronje@firga.sun.ac.za -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From roger at ctios1.ctio.noao.edu Wed Sep 23 15:55:29 1998 From: roger at ctios1.ctio.noao.edu (Roger Smith CTIO - rsmith@noao.edu) Date: Thu Jul 29 11:54:35 2004 Subject: Non-linearity induced by pixel timing Message-ID: <199809231955.MAA27094@noao.edu> Posted to CCD-world: -+-+-+- Dear CCD-World, I have encountered a trade-off between readout speed and linearity when using the Dual Slope Integrator implementation of a Double Correlated Sampler. The same mechanism could also cause Clamp-Sample processors to deliver less than optimal linearity. I began by looking for ways to reduce pixel time. As I understand clamp-sample processing, the clock feedthrough associated with the charge dump is integrated by the noise filter along with the signal itself. This appears to be the primary reason that clamp-sample is considered to be faster than dual slope. I reasoned that it should be possible to do the same thing with dual slope integration. Is it really necessary to wait for the clock feedthrough to settle before integrating on the signal in the Dual Slope implemetation? So I tried it. It works well provided that the integrated clock feedthrough doesn't produce an unacceptably large offset. By pulsing only Summing Well (to dump the charge) while delaying the serial clocking to the end of the pixel (to avoid integrating its feedthrough), I was able to keep this offset down to less than 3% of the dynamic range. I was delighted to chop microseconds (20%) off my pixel time without any noise penalty whatsoever. However I had blown away the linearity! One has to be careful not to start the signal integration before all the charge has been delivered to the output node, because as SW goes low, charge begins to spill over the Last Gate sooner if the pixel is full than if it is near empty. If one begins the signal integration too soon, then the effective integration time is longer for strong signals than weak ones. This produced a 1-2% gain increase over the full dynamic range, which is ten times what I normally see and has opposite sign. I found that a good rule of thumb is to start the signal integration no sooner than the peak of the SW feedthrough pulse. (Measure this at the integrator input to include preamp propagation delay.) If I follow this rule , I retain optimum linearity while cutting pixel time by a microsecond or so. Clearly one can save more time by making the falling edge of SW faster (at the cost of RFI rejection) or by using a higher bandwidth preamp. What is "typical" linearity? If drain source voltage is sufficient (about 5V) and Reset Drain voltage is optimized (typically 14.0 +-0.5 V) then gain typically decreases by 0.2% over full signal range. This excludes any apparent gain loss at low signal due to charge trapping. I can imagine that those using Clamp-Sample processing could mistakenly conclude that their CCD delivered inferior linearity, if their SW edge was not fast enough in relation to their sample time. The effect is small, but is distinguished by an *increase* in gain with increasing signal. I hope this account helps someone out there. Roger Smith Senior Electronics Engineer / Manager - Array Controller Projects Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile Internet: rsmith@noao.edu Coordinates: 29.54 South, 71.16 West Phone: 56 (51) 225415 Bilingual receptionist (08:30-21:00) Fax: 56 (51) 205342/205212 Autoforward via US: 1 (520) 318-8259 Nat. Optical Astronomy Observatories,PO Box 26732,Tucson AZ 85726-6732 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From Ralph.Holtom at eev.com Mon Sep 21 14:01:02 1998 From: Ralph.Holtom at eev.com (Ralph.Holtom@eev.com) Date: Thu Jul 29 11:54:36 2004 Subject: Looking for larger chips Message-ID: Posted to CCD-world: -+-+-+- I have followed this debate with interest! I refer everyone to http://www.ccd.eev.com/ and then mail me on rh@eev.com Ralph Dr Ralph Holtom Manager CCD Sensors EEV -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From prj at ast.cam.ac.uk Mon Sep 21 09:08:42 1998 From: prj at ast.cam.ac.uk (Paul Jorden) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips Message-ID: Posted to CCD-world: -+-+-+- Hi, > At the Yunnan observatory, China, we are looking for > two kinds CCD chips. > > 1, backside illuminated > imager size: about 25mm*50mm > pixel size: 24um or larger > Readout noise: <5e > MPP You could look at EEV. Although their pixels are smaller, by binning 2*2 you get the same result. contact Ralph Holtom or Ivan Noy (Ralph.Holtom@eev.com, Ivan.Noy@eev.com) > 2, frontside illuminated > imager size:about 50mm*50mm > pixel size: 24um or larger > readout noise:<5e > MPP > Philips have made large unthinned devices, but noise is higher... ------------------------------------------------------------------- Paul Jorden: prj@ast.cam.ac.uk Web: http://www.ast.cam.ac.uk/RGO Royal Greenwich Observatory, Madingley Road, Cambridge, CB3 0EZ, UK. Phone: +44 (0) 1223- 374000 \direct phone- 374811 \RGO Fax- 374700 ** N.B. The RGO will be closed on 31 Oct 1998. ** -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From gerard.epstein at obspm.fr Fri Sep 18 09:34:20 1998 From: gerard.epstein at obspm.fr (Gerard Epstein) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips Message-ID: <1.5.4.32.19980918073420.007503ac@mesiob.obspm.fr> Posted to CCD-world: -+-+-+- At 23:41 1998/09/17 +0200, you wrote: >Posted to CCD-world: >-+-+-+- >Hi, > >Did you try to contact DALSA Corp. which was know >for its large CCD chips. Maybe rather used in medical >imagery. > > ----------------------------- >& Christian GUILLAUME >& Service Electronique >& CNRS / IGRAP Tel: (33).04.92.70.64.09 >& Observatoire de Haute Provence Fax: (33).04.92.70.64.64 >& 04870 St Michel l'Observatoire Email: guillaume@obs-hp.fr > --------------------------------------------------------------------------- qu'as tu contre EEV? = = = = = = = = = Gerard Epstein DESPA Observatoire de Meudon 5, Place Jules Janssen 92195 MEUDON CEDEX Tel 01 45 07 77 22 FAX 01 45 07 28 06 ========================= -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ccd at public.km.yn.cn Fri Sep 18 13:11:27 1998 From: ccd at public.km.yn.cn (Qian Song) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips References: <199809172346.QAA02444@site-inc.COM> Message-ID: <3601EB7F.133A65A6@public.km.yn.cn> Posted to CCD-world: -+-+-+- Dear Bob, I know the reasons. They just want to find if there is something costs lower. :) Qian Song CCD Lab. Beijing Observatory China boba@site-inc.com wrote: > Posted to CCD-world: > -+-+-+- > Dear Cao Wenda > > What is wrong with SITe CCDs? Many CCD consumers have great success > with SITe chips. > > Bob Asiello > Executive Vice President > SITe > -+-+-+- > For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From iss at pvtnetworks.net Thu Sep 17 21:15:54 1998 From: iss at pvtnetworks.net (iss@pvtnetworks.net) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips Message-ID: <199809180315.VAA06202@intergate.pvtnetworks.net> Posted to CCD-world: -+-+-+- Kaifan Ji writes, > If anyone knows any corporation besides SITe manufacture those kinds ccd >chips and their prices or anything about this subject, we will appreciate a >response. Texas Instriments used to make a 2k x 2k imager with 25 micron pixels, about 50 mm on a side. Don't know whether they still do or not. Andy Saulietis / ISS Alt-Az-Fp Drive Systems HDPE Worm Gears, Custom designs & Machine work 39 Silver Fox Trail Cloud Country Estates Mayhill NM 88339 505-687-3067 Voice 505-687-3021 Fax e-mail: iss@pvtnetworks.net 32 54 13 N 105 31 44 W 7300' elev How come you never hear about gruntled employees? -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From boba at site-inc.com Thu Sep 17 16:45:32 1998 From: boba at site-inc.com (boba@site-inc.com) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips In-Reply-To: <01bde05f$40092ce0$LocalHost@irccd> Message-ID: <199809172346.QAA02444@site-inc.COM> Posted to CCD-world: -+-+-+- Dear Cao Wenda What is wrong with SITe CCDs? Many CCD consumers have great success with SITe chips. Bob Asiello Executive Vice President SITe -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From guillaume at obs-hp.fr Thu Sep 17 23:41:00 1998 From: guillaume at obs-hp.fr (C.GUILLAUME) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips Message-ID: <199809172139.LAA15167@uwila.cfht.hawaii.edu> Posted to CCD-world: -+-+-+- Hi, Did you try to contact DALSA Corp. which was know for its large CCD chips. Maybe rather used in medical imagery. ----------------------------- & Christian GUILLAUME & Service Electronique & CNRS / IGRAP Tel: (33).04.92.70.64.09 & Observatoire de Haute Provence Fax: (33).04.92.70.64.64 & 04870 St Michel l'Observatoire Email: guillaume@obs-hp.fr --------------------------------------------------------------------------- ---- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ccd at public.yn.km.cn Tue Sep 15 12:13:53 1998 From: ccd at public.yn.km.cn (Cao Wenda) Date: Thu Jul 29 11:54:36 2004 Subject: looking for larger ccd chips Message-ID: <01bde05f$40092ce0$LocalHost@irccd> Posted to CCD-world: -+-+-+- Dear CCD Friends At the Yunnan observatory, China, we are looking for two kinds CCD chips. 1, backside illuminated imager size: about 25mm*50mm pixel size: 24um or larger Readout noise: <5e MPP 2, frontside illuminated imager size:about 50mm*50mm pixel size: 24um or larger readout noise:<5e MPP If anyone knows any corporation besides SITe manufacture those kinds ccd chips and their prices or anything about this subject, we will appreciate a response. Yours Kaifan Ji Yunnan observatory P.R.China -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From gsims at specinst.com Wed Aug 12 17:42:05 1998 From: gsims at specinst.com (Gary Sims) Date: Thu Jul 29 11:54:36 2004 Subject: Job Opening Message-ID: <199808130030.RAA28144@pantano.theriver.com> Posted to CCD-world: -+-+-+- Spectral Instruments in Tucson, AZ (www.specinst.com) has a job opening for a senior level technician or engineer that has experience with CCD based scientific imaging systems. A candidate should be familiar with basic CCD physics, low noise analog electronics, digital electronics related to camera control and data interface, and vacuum and cooling systems. Gary R. Sims President -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From rkohley at ll.iac.es Sat Aug 1 18:28:13 1998 From: rkohley at ll.iac.es (Ralf Kohley) Date: Thu Jul 29 11:54:36 2004 Subject: No subject Message-ID: <01BDBD7A.269990E0@ralf.gtc.iac.es> Posted to CCD-world: -+-+-+- Hi all, I just wanted to inform, that my working place has changed. I have moved from the University of Bonn to the GTC Project. The project has been founded to built a 10m segmented-mirror telescope on La Palma, Canary Islands. I will be responsible as detector engineer within the instrumentation group for the CCD and IR detectors. If you have any questions about the project, especially concerning detectors, do not hesitate to contact me. Greetings, Ralf ------------------------ Dr. Ralf Kohley Detector Engineer GTC Project GRANTECAN, S.A. Instituto de Astrofisica de Canarias c/ Via Lactea s/n E-38200 LA LAGUNA (Tenerife) SPAIN e-mail: rkohley@ll.iac.es phone: +34 (9)22 315 153 fax: +34 (9)22 315 032 http://www.gtc.iac.es -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tmca at cfht.hawaii.edu Wed Aug 5 08:50:55 1998 From: tmca at cfht.hawaii.edu (Tim Abbott) Date: Thu Jul 29 11:54:36 2004 Subject: CCD Camera System for sale Message-ID: <199808051850.IAA12691@kuanalu.cfht.hawaii.edu> Posted to CCD-world: -+-+-+- I appreciate that some may consider this spam, but here is an opportunity for a small-budget place to get their hands on a turnkey system. Please contact the address below if you're interested. Best regards, Tim Dickerson, Jon writes: > From jdickerson@rosetta.org Tue Aug 4 12:27:25 1998 > From: "Dickerson, Jon" > Subject: CCD Camera System > Date: Tue, 4 Aug 1998 15:27:00 -0700 > > Dr. Abbott- > Our company purchased a CCD Camera System from Spectral > Instruments in Tucson last year. We are a biotechnology company working > with gene chip technology, building the scanners, imaging, and > developing databases from the results. > We have decided to change direction and have adopted a different > imaging technique. As a result, we have a high-end CCD camera system > available for sale. > I viewed your web page and was hoping you could recommend a site > where we could advertise the system, or refer us to any individuals or > institutions who might be interested. So far we have contacted > two parties through Spectral Instruments, but I was hoping there might > be a better way to reach more interested parties. > If it would be appropriate, any assistance you could provide us > would be appreciated. System components are listed below. > Thank you. > > Jon Dickerson > Purchasing Services > Rosetta Inpharmatics, Inc. > 425-823-7326 > > Components: > 500 Series CCD Camera System consisting of: > 1) TK1024AB, 1024 x 1024 pixel CCD, backside-illuminated, grade > 1 > 2) TEC cooled camera head with 60oC minimum CCD temperature > below ambient > 3) 16 BIT 50 to 250 kHz digitization with <7 electrons noise @ > 100 kHz rate > 4) PDCI parallel digital camera interface for PCI bus with > Windows 95 and Linux drivers > 5) SI500image acquisition application for Windows 95 (Labview > Based) > 6) Power supply and water recirculator > 7) 10' power and data cables > 8) 500 Series camera electronics with programmable controller > for variable subarray and binning readout > 9) Iilex #4 shutter with Nikon lens mount > -- Timothy M. C. Abbott, Ph.D. http://www.cfht.hawaii.edu/~tmca/ Resident Astronomer tmca@cfht.hawaii.edu Canada-France-Hawaii Telescope Tel: +1 808 885 7944 Box 1597, Kamuela, HI 96743 Fax: +1 808 885 7288 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From HOFFBEMG at sterlingdi.com Tue Aug 4 14:37:26 1998 From: HOFFBEMG at sterlingdi.com (Michael Hoffberg) Date: Thu Jul 29 11:54:36 2004 Subject: Seek for help about the Thomson THX7899 2048x2048CCDs Message-ID: Posted to CCD-world: -+-+-+- Since I don't have a databook in front of me, I am not sure how similar the THX7899 is to the TH7895, but, as far as I remember, the data sheets for the TH7895 / TH7896 were pretty good. We were able to run the chips at over 10 M pixels/second (high speed output). http://www.aps.anl.gov/xfd/Detectors/ I don't know how far work has progressed on the other sensors mentioned in the web page, but the CCD cameras based on the Thompson and TI CCDs were functional. MIKE >>> Tim Abbott 08/04 2:10 PM >>> Posted to CCD-world: -+-+-+- Forwarded from Zhaowang Zang: zhaowang zhao writes: > > Dear CCD-world friends, > I am an engineer for making CCD controller for about 10 years. > I used to use TI > CCD chip to made 5 CCD cameras. Recently I plan to use the THOMSON CCDs > (such as THX7899 2048x2048 CCD). In order to study the very valuable > experience to make > high quality CCD controller, I would like to write this mail to you. If > you or your colleague have > the experiences with the THOMSON CCDs please give me some suggestions > and good idea. > Best wishes. > ---------------------------------------------------------------------------------------------- > > Zhaowang Zhao > Beijing Astronomical Observatory > Datun Rd. #20A > Chaoyang District > Beijing 100012 > China > -- Timothy M. C. Abbott, Ph.D. http://www.cfht.hawaii.edu/~tmca/ Resident Astronomer tmca@cfht.hawaii.edu Canada-France-Hawaii Telescope Tel: +1 808 885 7944 Box 1597, Kamuela, HI 96743 Fax: +1 808 885 7288 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tmca at cfht.hawaii.edu Tue Aug 4 08:10:40 1998 From: tmca at cfht.hawaii.edu (Tim Abbott) Date: Thu Jul 29 11:54:36 2004 Subject: Seek for help about the Thomson THX7899 2048x2048CCDs Message-ID: <199808041810.IAA27438@kuanalu.cfht.hawaii.edu> Posted to CCD-world: -+-+-+- Forwarded from Zhaowang Zang: zhaowang zhao writes: > > Dear CCD-world friends, > I am an engineer for making CCD controller for about 10 years. > I used to use TI > CCD chip to made 5 CCD cameras. Recently I plan to use the THOMSON CCDs > (such as THX7899 2048x2048 CCD). In order to study the very valuable > experience to make > high quality CCD controller, I would like to write this mail to you. If > you or your colleague have > the experiences with the THOMSON CCDs please give me some suggestions > and good idea. > Best wishes. > ---------------------------------------------------------------------------------------------- > > Zhaowang Zhao > Beijing Astronomical Observatory > Datun Rd. #20A > Chaoyang District > Beijing 100012 > China > -- Timothy M. C. Abbott, Ph.D. http://www.cfht.hawaii.edu/~tmca/ Resident Astronomer tmca@cfht.hawaii.edu Canada-France-Hawaii Telescope Tel: +1 808 885 7944 Box 1597, Kamuela, HI 96743 Fax: +1 808 885 7288 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From satoshi at anela.mtk.nao.ac.jp Thu Jul 23 00:55:43 1998 From: satoshi at anela.mtk.nao.ac.jp (Satoshi Miyazaki) Date: Thu Jul 29 11:54:36 2004 Subject: new web page at National Astronimical Observatory of Japan Message-ID: <199807221555.AAA01129@anela.mtk.nao.ac.jp> Posted to CCD-world: -+-+-+- Hi CCD world, We opend a new web site here at CCD detector lab, National Astronimical Observatory of Japan. We are in charge of providing CCDs with optical instruments for Subaru. The contents includes: (1) Relative QE of CCDs from MIT, SITe and EEV measured here with a simple QE bench. Absolute values of QE measured with different sysmtem are hard to compare. We may have some systematic error but relative comparison should have some meanings. (2) New results from 2k4k (15 micron pixel) CCDs developed by Hamamatsu photonics, Japan. The URL is http://anela.mtk.nao.ac.jp If you are busy, check out only http://anela.mtk.nao.ac.jp/evaluation/comparison.htm which has a summary of the report. We welcome your comments and suggestions. Please write to us at http://anela.mtk.nao.ac.jp/wwwboard/wwwboard.html -Satoshi MIYAZAKI -National Astronomical Observatory of Japan -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ssutherl at gammametrics.com Mon Jul 20 09:49:56 1998 From: ssutherl at gammametrics.com (Sutherland, Scott) Date: Thu Jul 29 11:54:36 2004 Subject: large ccd for spectroscopy Message-ID: Posted to CCD-world: -+-+-+- Hello All: Sergio Hernandez alonso wrote: > At the University of La Laguna we are trying to make a prototype > of > a cooled CCD camera for spectroscopy. > Our main restrictions are: > > CCD chip area: 20 X 2 mm or higher > Exposition time from 10 to 100 micro seconds > [Sutherland, Scott] Correct me if I am wrong, but doesn't such a short integration time require an intensified, gated CCD? I don't know of any shutters that have this fast a transit time, especially with the larger chip area. > Low noise > High sensitivity > [Sutherland, Scott] Specifics? How low? At what temp? High sensitivity in what wavelength region? > Wave-length from 400 to 1100 nm > Budget less than 2000 USA dollars > [Sutherland, Scott] I cannot say for EEV or PixelVision, but the new Hamamatsu CCD chip, which is 1024 x 64, 128, or 256, with 24 um pixels, is not bad. To get really low dark current, you'll need to cool it lower than the integrated TE cooled based units. It is a back thinned chip with excellent QE (up to 90% peak) out to 1100 nm and a high peak in the UV. I think that the smaller height version will be under $2000. Hope this helps. Scott Sutherland -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From jbeletic at eso.org Sun Jul 19 21:58:28 1998 From: jbeletic at eso.org (James Beletic) Date: Thu Jul 29 11:54:36 2004 Subject: New Position at ESO for CCD Detector Specialist Message-ID: Posted to CCD-world: -+-+-+- 19 July 1998 Hello CCD world, I am pleased to announce that the European Southern Observatory (ESO) has opened up a new staff position for a "CCD Detector Specialist" in ESO's Optical Detector Team (ODT). The announcement, which has been distributed via snail mail and some of you may have seen, is attached to the end of this E-mail. It is now a very exciting time at ESO for CCDs. We are enjoying success with our new CCD controller, we have a large number of CCD procurements in process, we are working a large variety of instruments and we continue to work on new technologies for characterizing and optimizing CCDS - all while enjoying strong support from the organization. Our new FIERA CCD controller is now maturing as several systems are in place at ESO's La Silla and Paranal observatories and FIERA is living up to its pre-fabrication hype (millions of pixels per port per second and up to 16 ports read in parallel, amongst other attributes). Besides the hardware performances, the FIERA software is also maturingly well; the software is an important and very solid part of our system. We believe that FIERA will allow us to get the best performance out of any CCD that we will procure during the next decade. For CCD procurement, we are now regularly receiving the EEV 2k x 4k, 15 micron devices and those are consistently providing performance that meets or exceeds the relatively high level specifications. We will soon begin receiving thinned versions of a specially designed 128 x 128 pixel, split frame transfer, 16 port device from EEV - a CCD for adaptive optics wavefront sensing. At the same time, we are receiving MIT/LL 2k x 4k, 15 micron devices. Also, we continue to receive 2k x 2k, 15 micron and 2k x 2k, 24 micron devices from the Loral / U. Arizona process and these and several Tektronix / SITe 2k x 2k, 24 micron devices are being installed into new instruments. These CCDs are part of ~15 optical detector systems that we are delivering during 1998-2000 - systems for imaging, spectroscopy, adaptive optics and multi-purpose instruments. Many of the new instruments are for ESO's Very Large Telescope (VLT) facility at the Paranal Observatory, which had a successful "first light" this past May on unit telescope #1. However, the ODT is also part of several new developments for ESO's La Silla Observatory, one of which is an 8k x 8k wide field imager that will be mounted at the telescope in October/November of this year. As with many observatories, we look further ahead and hope to soon have the go-ahead for a 16k x 16k mosaic that will be installed in 2001 on a survey telescope that will be installed on Cerro Paranal. In the laboratory, we have been furthering our diagnostic equipment and we have a new CCD testbench that is becoming our workhorse for testing the large number of CCDs. We are also working on other diagnostic tools for quantifying the performance of CCDs and mosaics (e.g. a 1 micron point source projector and a mosaic flatness measurement system). Our team's mandate is for "cradle to grave" care of the systems. Thus, our team includes the Optical Detector Group at the La Silla Observatory and members of the Instrumentation Team at the Paranal Observatory. We also keep looking ahead to new technologies which may be useful at our telescopes several years in the future. This includes keeping an eye on the development of Superconducting Tunneling Junctions (STJs) and CMOS devices. We expect the person who takes this job will wear the hat of system integrator, taking over the "instrument responsible" task for the systems being delivered to several instruments. In addition to this "integration, delivery and interface" type of work, the person selected is also expected to work in the "research and development" area of optical detectors, taking a lead in optimizing detector performance, specifying and overseeing new detector developments and keeping track of the new technologies on the horizon. We are looking for someone who is very experienced and knowledgeable about CCDs, who wishes to continue in the research and development of detectors, but who also enjoys the system integration aspect of putting systems into instruments. As we place high emphasis on continued professional development, all members of our team to undertake "training" each year. We expect the person selected for this post to be an active participant in international conferences and to publish on a regular basis. All of the above text is to convince you that ESO and the Optical Detector Team is a great place in which to work. But actually the above information is only part of the story. The best part is not given in number of CCDs or the variety of projects; the best part is the work environment of our team. The person selected for this post will join a group of dedicated and energetic professionals who have formed a tight multi-cultural team (we number 8 nationalities at present.....not counting Bavaria as a country separate from Germany). We are a team which enjoys each other's company both during work and also for more energetic (skiing in the Alps) and cultural (latest sci-fi flick) activities. Besides our immediate group, a very appealing aspect of the work at ESO is that our team works closely with a large number of highly qualified people in the areas of cryogenics, optics, mechanical design, etc. - too many to list, but the message is that there is a strong support structure for areas outside our domain. (And of course, I am not even listing all persons involved in getting the telescopes working!) In summary, the ESO environment is excellent: We have a large amount of challenges provided by many diverse projects and instruments, we enjoy the strong support of the organization for our work, and there is an ever interesting mosaic of international collaborations. With regards to lifestyle / living conditions, the Munich area provides a comfortable and very safe environment for family with a wide variety of cultural, sports and other attractions (especially when the weather is good). For persons with families, there are a selection of excellent schools for children, although the new facility for the Bavarian International School deserves note. The papers published in the conference proceedings for the 1996 ESO CCD workshop provide a fairly good view into most aspects of our work. Please contact our group assistant, Cathy Chaillon (cathy.chaillon@eso.org), if you wish to receive a copy of these papers. The Personnel Officer in charge of this recruitment is Ms. Kathrin Bruchmann (kathrin.bruchmann@eso.org, telephone: +49 89 320 06438). Please contact her if you think she can help you with your application. And of course, please contact me if I can provide more information. As I will be on travel during 25 July through 11 August, please contact Cathy Chaillon during my absence. Application deadline is 15 September, with the aim of having interviews at ESO during the second half of September. We hope to recruit a top-notch person for our team. We appreciate it if you would please forward this notice to anyone whom you think may be interested. I personally offer a "finder's fee"* to whomever provides the reference to the person we hire. With best wishes, Jim Beletic *Gourmet home-cooked dinner followed, the next day, by a personal tour of Munich and its surroundings. ------------------------------------------------------------------------ VACANCY NOTICE Posted by the EUROPEAN SOUTHERN OBSERVATORY ------------------------------------------------------------------------ Applications are invited for the post described below, now vacant in the Optical Detector Group of the Instrumentation Division at the ESO Headquarters in Garching near Munich, Germany. This post is open to suitably qualified men and women. Title: CCD Detector Specialist Code: 204 (Refer to this in any application letters) Education: University degree in physics, electrical / electronic engineering or equivalent (Ph.D. preferred) Experience and knowledge: Several years experience in the following areas is required: - Solid foundation in the physics of solid state electronic devices - Substantial experience in the testing and implementation of CCD devices - Knowledge of CCD controller electronics (hardware and software) - Strong oral and written communication skills in English and a cooperative teamwork attitude The ideal candidate will have: - Experience with CCD detectors that demonstrates world-class proficiency, such as very low noise performance, unique implementations (mosaics, high speed readout) or CCD controller development - Extensive experience implementing CCD devices at astronomical telescopes - Proficiency in computer programming (C, C++), hardware interfacing and electronic design packages Assignment: The selected candidate is expected to take a leadership role in: - CCD specification, procurement, characterization and optimization - Implementation of CCD devices into instrument systems and optimization of system performance - Interfacing with instrument consortia and deployment of systems at telescopes in Chile - Investigation of new detector technologies (next generation CCDs, STJs and other devices) Information about the working environment: The mission of the ESO's Optical Detector Team is to provide the best optical detector technology to ESO's Very Large Telescope facility (four 8-meter telescopes plus an inteferometric array) on Cerro Paranal and ESO's suite of telescopes on Cerro La Silla. ESO has developed a high speed, low noise CCD controller and is procuring the newest generation of CCD detectors. This position offers an excellent opportunity to work at the leading edge of optical detector systems in a variety of instrument applications. The selected person will be expected to publish papers and to continue his/her professional growth. Duty station: Garching near Munich, Germany, with periodic missions (1-2 per year) to ESO's telescopes in Chile. These trips will be 2-4 weeks in duration. Starting date: As soon as possible Contract: This position is for a period of three years with the possibility of a fixed term extension. After the fifth year of service, the position will be considered for an indefinite contract. Remuneration: The remuneration for this post will be commensurate with the background, experience and family status. The basic monthly salary (tax-free) will not be less than DM 6,480. Furthermore, an expatriation allowance as well as some other allowances may be added. Application Deadline: 15 September 1998. ========================================================================= James W. Beletic E-mail: jbeletic@eso.org European Southern Observatory Phone: +49-89-320-06520 Karl-Sch-Str 2, D-85748 Garching, GER FAX: +49-89-320-2362 ========================================================================= -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From oiwert at eso.org Wed Jul 8 08:15:34 1998 From: oiwert at eso.org (Olaf Iwert) Date: Thu Jul 29 11:54:37 2004 Subject: Backside thinninhg on commercial CCDs Message-ID: <199807080615.IAA06658@mc14.hq.eso.org> Posted to CCD-world: -+-+-+- Dear Markus, As far as I know at least Philips, Thomson and EEV have been developping commercial HDTV sensors with backside thinning already since some years. However these were mainly devices of small size (mainly 1/2" or 3/4") compared to scientific CCDs. Also the requirements concerning speed versus noise were much different from scientific CCDs. Concerning your second question there have been small size CCDs for medical imaging by LORAL about 5 years ago, where the whole drive electronics and ADC chain, where done on one piece of silicon. Cheers =============================================================================== Olaf Iwert E-mail : oiwert@eso.org European Southern Observatory Phone & Voice Mail : +49-89-3200-6353 Optical Detector Lab FAX : +49-89-3200-6358 Karl-Schwarzschild-Str 2 85748 Garching GERMANY =============================================================================== -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Wed Jul 1 01:17:27 1998 From: MYPIXEL at aol.com (MYPIXEL@aol.com) Date: Thu Jul 29 11:54:37 2004 Subject: PROCESS DAMAGE Message-ID: <71557771.3599c668@aol.com> Posted to CCD-world: -+-+-+- In a message dated 6/30/98 9:55:21 AM Pacific Daylight Time, theuwiss@natlab.research.philips.com writes: << Dear all, Nice report about dark current, but I do not fully agree with the last statement that the aluminum light shield can shield radiation damage ! The effect of aluminum light shield is just the other way around. The aluminum acts as a catalysator to create very active hydrogen radicals. The latters are very active in the subsequent annealing process. This effect makes the dark current (generated thru surface states) much lower in the aluminum covered areas. Regards, Albert Theuwissen. Philips Imaging Technology >> *************************jj Thanks Albert .. . . Would that mean we should cover the entire CCD with aluminum, anneal, and then do a wet-etch for frame transfer to improve dark current? Jim *************************jj -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From theuwiss at natlab.research.philips.com Tue Jun 30 11:40:24 1998 From: theuwiss at natlab.research.philips.com (dr.ir. A.J.P. Theuwissen) Date: Thu Jul 29 11:54:37 2004 Subject: PROCESS DAMAGE References: Message-ID: <3598B288.BF5@natlab.research.philips.com> Posted to CCD-world: -+-+-+- MYPIXEL@aol.com wrote: > > Posted to CCD-world: > -+-+-+- > *******************************jj > > Ever wondered why dark current is different in the lower and upper sections of > a CCD (i.e., notably for frame and split frame transfer CCDs with or without > light shields). Find below a memo already in discussion that discusses this > interesting phenomena. > > *******************************JJ > > Similar effects can be experienced with off-the-shelf CCDs to a much lesser > degree. The effect is most obvious for frame transfer and split frame transfer > CCDs that show different dark current levels in the image and storage regions > of the array (with or without light shields). For example, Figure ? shows the > amount of dark current generated in each section of a split-frame transfer CCD > without light shield. Note four distinct levels are measured for each section. > Other CCDs measured from the same wafer show different dark current patterns > and levels. The dark current difference has been attributed to ionizing > radiation that is generated during the processing of the CCD. High energy > processes such as plasma etching, ion implantation, sputtering, often generate > damaging secondary x-rays.The radiation damage induced is usually nonuniform > from section-to-section and phase- to-phase because the poly gates float to an > arbitrary voltage level (there is no reason to assume that poly gates assume > ground potential during processing). For reasons explained above, damage is a > function of applied gate voltage with the highest damage induced for the > highest gate potential. High temperature anneal cycles (e.g., H2 forming gas > anneal) are employed to eliminate ionizing damage throughout the process > cycle. However, the user may still find remnants of this damage when taking > dark current images. > > Radiation damage during processing can also degrade CTE due to nonuniform > flat-band shifts within a pixel (the amount of degradation typically follows > the level of dark current measured). For example, the flat-band shifts may be > greater in the middle of a phase compared to the edge of phase because poly > gate overlaps partially shield the channel from incoming radiation. A > different flat-band shift within a phase can induce potential barrier at the > edge of phase and disturb CTE performance. The problem is most prevalent near > the birds-beak where flat-band shift is greatest. In fact, as Figure ? shows, > signal charge may actually transfer near the birds beak leading to some > interesting CTE characteristics. Again, CCD manufacturers attempt to eliminate > flat-band shifts by taking the wafers through anneal cycles each time a high > energy process is applied. > > It is interesting to note that when a CCD is exposed to low dose of gamma- > radiation (Co-60) that CTE performance is generally maintained (gamma-rays can > disturb the silicon lattice directly and induce bulk damage but the amount of > radiation required is significant to be noticeable: >5 kRAD). For example, the > CCD characterized in Figure ? exhibits excellent CTE characteristics even > though dark current and flat-band voltage shift are significant. On the other > hand, the same dose of x-rays or UV light would have greatly influenced CTE > performance. The reason for this result is gamma- rays will interact with the > oxide uniformily across a pixel because they are nearly impossible to shield > (their range is much greater than UV or x-ray photons). The same CTE problem > occurs when the CCD is exposed to UV light shortward of 1800 A where > electron-holes are generated in the oxide. In that UV light exhibits a very > short absorption length, shielding effects such as poly gate overlaps, > influence the amount of electron-holes pairs generated. Therefore, radiation > damage is spatially induced. > > Another common radiation process problem is related to the aluminum light > shield that covers the storage region of a frame and split-frame transfer CCD. > During aluminum deposition, which typically involves a sputtering process, > secondary x-rays are generated causing radiation damage. When the light > shield is patterned with a dry plasma etch additional radiation is seen by the > CCD. In the latter case, dark current is normally greater in the image region > because the aluminum that remains over the storage region acts as a shield. > Unfortunately high temperature annealing is limited after aluminum is > deposited making the device more vulnerable to radiation during these last > process steps. > > *************************************JJ > -+-+-+- > For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. Dear all, Nice report about dark current, but I do not fully agree with the last statement that the aluminum light shield can shield radiation damage ! The effect of aluminum light shield is just the other way around. The aluminum acts as a catalysator to create very active hydrogen radicals. The latters are very active in the subsequent annealing process. This effect makes the dark current (generated thru surface states) much lower in the aluminum covered areas. Regards, Albert Theuwissen. Philips Imaging Technology -- ------------------------------------------------------------------------------ Theuwissen, dr.ir. A.J.P. Philips Imaging Technology Eindhoven Building: WAG1-3-15 Prof. Holstlaan 4 Phone: +31 40 274 2734 5656 AA Eindhoven Fax: +31 40 274 3390 The Netherlands Mob: +31 65 345 2707 E-mail: theuwiss@natlab.research.philips.com -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Tue Jun 30 01:50:16 1998 From: MYPIXEL at aol.com (MYPIXEL@aol.com) Date: Thu Jul 29 11:54:37 2004 Subject: PROCESS DAMAGE Message-ID: Posted to CCD-world: -+-+-+- *******************************jj Ever wondered why dark current is different in the lower and upper sections of a CCD (i.e., notably for frame and split frame transfer CCDs with or without light shields). Find below a memo already in discussion that discusses this interesting phenomena. *******************************JJ Similar effects can be experienced with off-the-shelf CCDs to a much lesser degree. The effect is most obvious for frame transfer and split frame transfer CCDs that show different dark current levels in the image and storage regions of the array (with or without light shields). For example, Figure ? shows the amount of dark current generated in each section of a split-frame transfer CCD without light shield. Note four distinct levels are measured for each section. Other CCDs measured from the same wafer show different dark current patterns and levels. The dark current difference has been attributed to ionizing radiation that is generated during the processing of the CCD. High energy processes such as plasma etching, ion implantation, sputtering, often generate damaging secondary x-rays.The radiation damage induced is usually nonuniform from section-to-section and phase- to-phase because the poly gates float to an arbitrary voltage level (there is no reason to assume that poly gates assume ground potential during processing). For reasons explained above, damage is a function of applied gate voltage with the highest damage induced for the highest gate potential. High temperature anneal cycles (e.g., H2 forming gas anneal) are employed to eliminate ionizing damage throughout the process cycle. However, the user may still find remnants of this damage when taking dark current images. Radiation damage during processing can also degrade CTE due to nonuniform flat-band shifts within a pixel (the amount of degradation typically follows the level of dark current measured). For example, the flat-band shifts may be greater in the middle of a phase compared to the edge of phase because poly gate overlaps partially shield the channel from incoming radiation. A different flat-band shift within a phase can induce potential barrier at the edge of phase and disturb CTE performance. The problem is most prevalent near the birds-beak where flat-band shift is greatest. In fact, as Figure ? shows, signal charge may actually transfer near the birds beak leading to some interesting CTE characteristics. Again, CCD manufacturers attempt to eliminate flat-band shifts by taking the wafers through anneal cycles each time a high energy process is applied. It is interesting to note that when a CCD is exposed to low dose of gamma- radiation (Co-60) that CTE performance is generally maintained (gamma-rays can disturb the silicon lattice directly and induce bulk damage but the amount of radiation required is significant to be noticeable: >5 kRAD). For example, the CCD characterized in Figure ? exhibits excellent CTE characteristics even though dark current and flat-band voltage shift are significant. On the other hand, the same dose of x-rays or UV light would have greatly influenced CTE performance. The reason for this result is gamma- rays will interact with the oxide uniformily across a pixel because they are nearly impossible to shield (their range is much greater than UV or x-ray photons). The same CTE problem occurs when the CCD is exposed to UV light shortward of 1800 A where electron-holes are generated in the oxide. In that UV light exhibits a very short absorption length, shielding effects such as poly gate overlaps, influence the amount of electron-holes pairs generated. Therefore, radiation damage is spatially induced. Another common radiation process problem is related to the aluminum light shield that covers the storage region of a frame and split-frame transfer CCD. During aluminum deposition, which typically involves a sputtering process, secondary x-rays are generated causing radiation damage. When the light shield is patterned with a dry plasma etch additional radiation is seen by the CCD. In the latter case, dark current is normally greater in the image region because the aluminum that remains over the storage region acts as a shield. Unfortunately high temperature annealing is limited after aluminum is deposited making the device more vulnerable to radiation during these last process steps. *************************************JJ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From geary at cfa.harvard.edu Thu Jun 18 08:15:08 1998 From: geary at cfa.harvard.edu (John Geary) Date: Thu Jul 29 11:54:37 2004 Subject: Intl. Conf. on Scientific Optical Imaging - #4 Message-ID: <199806181215.IAA02729@jupiter.harvard.edu> Posted to CCD-world: -+-+-+- The ICSOI-4 conference now has a web site at www.chem.arizona.edu/icsoi where you can get more information and contact the organizer, Bonner Denton. 2-5 December on Grand Cayman island. I hope that a lot of the CCD community will be able to come, and to give presentations. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From jbeletic at eso.org Tue Jun 2 09:01:14 1998 From: jbeletic at eso.org (James Beletic) Date: Thu Jul 29 11:54:37 2004 Subject: Cayman Conference - yes, this December. Message-ID: Posted to CCD-world: -+-+-+- I'll be there with fins on!!!!!!!!!!! Jim ========================================================================= James W. Beletic E-mail: jbeletic@eso.org European Southern Observatory Phone: +49-89-320-06520 Karl-Sch-Str 2, D-85748 Garching, GER FAX: +49-89-320-2362 ========================================================================= -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Tue Jun 2 01:18:03 1998 From: MYPIXEL at aol.com (MYPIXEL@aol.com) Date: Thu Jul 29 11:54:37 2004 Subject: *** Re: CTE stability Message-ID: <4742902e.35738b0c@aol.com> Posted to CCD-world: -+-+-+- ***********************************jj Ali, In theory CTE should be stable if operating conditions are stable. CTE is typically dependent on operating temperature, charge packet size, the density of charge packets and transfer time. CTE is either limited by bulk traps (impurities and lattice vacancies in silicon) or spurious barriers induced by improper design or processing. We have measured CTEs as good as 0.9999999 for "bulk state limited" devices. CTE this high is often statistical and exhibits a variance. That is, CTE varies from column to column depending on the number of traps in a column or shift register. CTE is always measured absolutely (relative measurements underestimate CTE performance). We have found that x-ray measurement is the only way to properly measure CTE. Are you familiar with the technique? Hope this information helps out .. . Jim **********************************jj In a message dated 98-05-29 11:42:18 EDT, amohamma@estec.esa.nl writes: << Subj: CTE stability Date: 98-05-29 11:42:18 EDT From: amohamma@estec.esa.nl Reply-to: CCD-world@cfht.hawaii.edu To: CCD-world@cfht.hawaii.edu Posted to CCD-world: -+-+-+- Dear CCD world, We are trying to find ways of measuring a CCD?s CTE stability. I therefore wonder if any boy has performed this measurement before and if so what method was used and what values for CTE stability were obtained (would it be possible to measure a value of 10E-7)? In advance I, would like to thank you very much for your help. Best regards Ali Ali Mohammadzadeh (TOS-QCA) Radiation Effects and Analysis Techniques Unit Component Division, ESTEC, ESA Tel: +31 71 565 5894 Fax: +31 71 565 6637 E-mail: amohamma@estec.esa.nl -+-+-+- For information about CCD-world, send email to owner-CCD- world@cfht.hawaii.edu. ----------------------- Headers -------------------------------- Return-Path: Received: from relay30.mx.aol.com (relay30.mail.aol.com [172.31.109.30]) by air13.mail.aol.com (v43.20) with SMTP; Fri, 29 May 1998 11:42:17 -0400 Received: from niu.cfht.hawaii.edu (niu.cfht.hawaii.edu [128.171.80.58]) by relay30.mx.aol.com (8.8.5/8.8.5/AOL-4.0.0) with ESMTP id LAA09336 for ; Fri, 29 May 1998 11:42:10 -0400 (EDT) Received: from uwila.cfht.hawaii.edu ([128.171.80.50]) by niu.cfht.hawaii.edu (Post.Office MTA v3.1.2 release (PO203-101c) ID# 0-44996U300L100S0) with ESMTP id AAA19002 for ; Thu, 28 May 1998 23:40:13 -1000 Received: from esacom-04.estec.esa.nl (firewall-user@esacom-04.estec.esa.nl [131.176.26.3]) by uwila.cfht.hawaii.edu (8.8.8/8.8.8) with SMTP id XAA11293 for ; Thu, 28 May 1998 23:40:24 -1000 (HST) Received: by esacom-04.estec.esa.nl; id LAA12851; Fri, 29 May 1998 11:39:38 +0200 Received: from estecmail4.estec.esa.nl(131.176.7.65) by esacom-04.estec.esa.nl via smap (4.0a) id xma012830; Fri, 29 May 98 11:38:54 +0200 Received: by estecmail1.estec.esa.nl(Lotus SMTP MTA SMTP v4.6 (462.2 9-3-1997)) id 41256613.003A7E15 ; Fri, 29 May 1998 11:38:53 +0100 From: amohamma@estec.esa.nl To: CCD-world@cfht.hawaii.edu Message-ID: <41256613.003A1D6F.00@estecmail1.estec.esa.nl> Date: Fri, 29 May 1998 11:36:50 +0100 Subject: CTE stability Mime-Version: 1.0 Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: quoted-printable Reply-To: CCD-world@cfht.hawaii.edu >> -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From kt at aaossz.aao.GOV.AU Tue Jun 2 13:25:45 1998 From: kt at aaossz.aao.GOV.AU (Keith Taylor) Date: Thu Jul 29 11:54:37 2004 Subject: Fast readout CCDs Message-ID: <199806020325.NAA03545@aaossz.aao.gov.au> Posted to CCD-world: -+-+-+- Paul, Any chance of hearing from you re. EEV ? Cheers, Keith -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From andersen at not.iac.es Tue Jun 2 02:11:58 1998 From: andersen at not.iac.es (Michael Andersen) Date: Thu Jul 29 11:54:37 2004 Subject: More cryostat window matters In-Reply-To: <3.0.5.32.19980527144059.0086c5c0@orion> Message-ID: Posted to CCD-world: -+-+-+- Roy and others! Sorry for the late reply. If you apply a very thin silver coat on the inside of your window, you should obtain very good reflectivity in the IR while retaining essentially 100% transmission in the optical. You might contact Dr. Ganswein at Zeiss in Germany - they have been making some optical/IR dichroics using silver (I could dig up a fax number). Or you might ask Eli Atad (ea@roe.ac.uk), he should know more about the optical properties. My previous coleauge in Copenhagen, Anton Norup, tried to swap the window for an aluminium dummy (this should give largely the same effect), but he was not able to see any difference in thermal load. So maybe it is just theory. This is a largely undiscussed subject - which is a pity, since it should give a signigicant difference in thermal load on large arrays/mosaics. Cheers, Michael On Wed, 27 May 1998, Roy Tucker wrote: > Another inquiry regarding windows, if I may. Materials used for > cryostat windows are generally either transparent to 'thermal' infrared > (the 10 micron wavelength radiation that our room temperature environment > provides us) or totally block such radiations. In either case, the CCD > 'sees' either a warm window or a warm outside world which represents a > radiative heat load to the cryostat cooling system. An absorbent window > will also be cooled, perhaps to the point of dew condensation. Has anyone > experimented with some sort of coating on the interior surface of the > window that is highly transparent to the wavelengths that the CCD detects > but is reflective to the thermal infrared to reduce detector heating and > condensation? I can't imagine such a coating which probably means I haven't > been reading the right journals. -------------------------------------------------------------------------------- Michael I. Andersen Support Astronomer, Nordic Optical Telescope Apatado 474, Santa Cruz de La Palma, E-38700 Office, sea level : +34 22 42 54 70 Fax, sea level : +34 22 42 54 75 Telescope : +34 22 40 56 60 Service building : +34 22 40 56 62 Home : +34 22 41 66 85 -------------------------------------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From geary at cfa.harvard.edu Mon Jun 1 14:39:10 1998 From: geary at cfa.harvard.edu (John Geary) Date: Thu Jul 29 11:54:37 2004 Subject: Cayman Conference - yes, this December. Message-ID: <199806011839.OAA11365@jupiter.harvard.edu> Posted to CCD-world: -+-+-+- I just got word that Bonner is indeed going ahead with the Intl. Conference on Scientific Optical Imaging, 2-5 December. Although it is now pretty late in the year, I hope many of the CCD folks here on the list will still be able to attend. Look forward to seeing you there, if at all possible. Let's start working on our papers soon! Conference organizer: Bonner Denton (mbdenton@u.arizona.edu). --J. Geary -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From prj at ast.cam.ac.uk Mon Jun 1 15:09:59 1998 From: prj at ast.cam.ac.uk (Paul Jorden) Date: Thu Jul 29 11:54:37 2004 Subject: Fast readout CCDs Message-ID: Posted to CCD-world: -+-+-+- Niall, > Posted to CCD-world: > -+-+-+- > I am looking to source a CCD which can be read out at GHz rates with rms > noise values in the 4 e- range (i.e., typical scientific grade). I have > heard that such devices, measuring 512x512 pixels, are available, but have > been unable to track down a supplier. The application I have in mind > involves fast differential photometry which we currently perform using CCDs > that take of order 50s to read out. Any help in this area would be much > appreciated, especially as funding deadlines are looming! > Unless you know something that I don't, I hope you do not mean 'GHz' readout rates. However, CCDs with MHz pixel rates exist. For example EEV make newish devices that yield ~ 5 e- rms noise at ~ 1 MHz/ pixel. The CCD39 (80*80) device allows a full-frame-readout (via 4 corners) in hardly more than 1 mS. Also the CCD42 series devices (512*2K and larger..) yield similar performance. They have other formats with the same sort of output amplifiers I think (eg CCD47, 1k*1k). It would be best to contact EEV directly for availability; some of the new devices are hardly available ex-stock yet! Regards, Paul Jorden ------------------------------------------------------------------- Paul Jorden: prj@ast.cam.ac.uk Web: http://www.ast.cam.ac.uk/RGO Royal Greenwich Observatory, Madingley Road, Cambridge, CB3 0EZ, UK. Phone: +44 (0) 1223- 374000 \direct phone- 374811 \RGO Fax- 374700 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From HOFFBEMG at sterlingdi.com Fri May 29 13:07:26 1998 From: HOFFBEMG at sterlingdi.com (Michael Hoffberg) Date: Thu Jul 29 11:54:37 2004 Subject: Fast readout CCDs Message-ID: Posted to CCD-world: -+-+-+- Sarnoff made a 512x512 CCD with 16 outputs. EEV also has an 8 output CCD. I don't know the noise specs off hand. MIKE Former web page: http://www.aps.anl.gov/xfd/Detectors/ >>> Niall Smith App Phy & Inst 05/29 7:49 AM >>> Posted to CCD-world: -+-+-+- I am looking to source a CCD which can be read out at GHz rates with rms noise values in the 4 e- range (i.e., typical scientific grade). I have heard that such devices, measuring 512x512 pixels, are available, but have been unable to track down a supplier. The application I have in mind involves fast differential photometry which we currently perform using CCDs that take of order 50s to read out. Any help in this area would be much appreciated, especially as funding deadlines are looming! Many thanks. Niall Smith Please note new e-mail address ----------------------------------------------------- Dr. Niall Smith Dept. of Applied Physics & Instrumentation Cork Institute of Technology Cork, Ireland e-mail : nsmith@cit.ie fax : +021 345191 phone : +021 326369 (lab. 326297) ----------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From nsmith at cit.ie Fri May 29 12:49:14 1998 From: nsmith at cit.ie (Niall Smith App Phy & Inst ) Date: Thu Jul 29 11:54:37 2004 Subject: Fast readout CCDs Message-ID: Posted to CCD-world: -+-+-+- I am looking to source a CCD which can be read out at GHz rates with rms noise values in the 4 e- range (i.e., typical scientific grade). I have heard that such devices, measuring 512x512 pixels, are available, but have been unable to track down a supplier. The application I have in mind involves fast differential photometry which we currently perform using CCDs that take of order 50s to read out. Any help in this area would be much appreciated, especially as funding deadlines are looming! Many thanks. Niall Smith Please note new e-mail address ----------------------------------------------------- Dr. Niall Smith Dept. of Applied Physics & Instrumentation Cork Institute of Technology Cork, Ireland e-mail : nsmith@cit.ie fax : +021 345191 phone : +021 326369 (lab. 326297) ----------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From amohamma at estec.esa.nl Fri May 29 11:36:50 1998 From: amohamma at estec.esa.nl (amohamma@estec.esa.nl) Date: Thu Jul 29 11:54:37 2004 Subject: CTE stability Message-ID: <41256613.003A1D6F.00@estecmail1.estec.esa.nl> Posted to CCD-world: -+-+-+- Dear CCD world, We are trying to find ways of measuring a CCD?s CTE stability. I therefore wonder if any boy has performed this measurement before and if so what method was used and what values for CTE stability were obtained (would it be possible to measure a value of 10E-7)? In advance I, would like to thank you very much for your help. Best regards Ali Ali Mohammadzadeh (TOS-QCA) Radiation Effects and Analysis Techniques Unit Component Division, ESTEC, ESA Tel: +31 71 565 5894 Fax: +31 71 565 6637 E-mail: amohamma@estec.esa.nl -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Wed May 27 14:40:59 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:37 2004 Subject: More cryostat window matters Message-ID: <3.0.5.32.19980527144059.0086c5c0@orion> Posted to CCD-world: -+-+-+- Another inquiry regarding windows, if I may. Materials used for cryostat windows are generally either transparent to 'thermal' infrared (the 10 micron wavelength radiation that our room temperature environment provides us) or totally block such radiations. In either case, the CCD 'sees' either a warm window or a warm outside world which represents a radiative heat load to the cryostat cooling system. An absorbent window will also be cooled, perhaps to the point of dew condensation. Has anyone experimented with some sort of coating on the interior surface of the window that is highly transparent to the wavelengths that the CCD detects but is reflective to the thermal infrared to reduce detector heating and condensation? I can't imagine such a coating which probably means I haven't been reading the right journals. Thanks! Roy Tucker -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From rsmith at ctios1.ctio.noao.edu Thu May 28 02:55:42 1998 From: rsmith at ctios1.ctio.noao.edu (Roger Smith) Date: Thu Jul 29 11:54:37 2004 Subject: Indium/glass seals References: Message-ID: <356D0A6E.9808BF8E@noao.edu> Posted to CCD-world: -+-+-+- Indium pundits, Have you noticed much reduction in the tendency for dewar windows to fog due to the better thermal contact made by an Indium seal. I suspect it might work for windows up to about 3" across since we have found it possible to demist these by applying a small amount of heat to the rim, when flushing with dry air is inconvenient. Roger Smith -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Sun May 24 13:51:49 1998 From: MYPIXEL at aol.com (MY PIXEL) Date: Thu Jul 29 11:54:38 2004 Subject: Indium/glass seals Message-ID: <9191ad52.35685e36@aol.com> Posted to CCD-world: -+-+-+- In a message dated 98-05-23 10:26:06 EDT, tucker@noao.edu writes: << Hello Fellow Photon Foragers, I am contemplating trying to use indium to produce a hermetic glass/metal seal around cryostat windows. I wonder if someone has tried this and what results they had. Thank you very much for any help. - Roy Tucker >> ******************jj Roy .. . . There are numerous CCDs (and vidicon tubes) currently in space that are indium sealed (quartz and MgF2 windows). A book could be written on the subject of indium sealing. The bottom line is preparation.. . . very clean surfaces and tons of pressure are required for a good seal (maintained with a screw ring). Once sealed hermeticity is good over an impressive operating temperature range (e.g., the Galieo CCD is currently operating at -120 C going through many temperature cycles). One can buy indium precut (recommended) because it is pain to form. Jim Janesick ********************jj -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mcba at newt.phys.unsw.edu.au Sun May 24 13:40:55 1998 From: mcba at newt.phys.unsw.edu.au (Michael C. B. Ashley) Date: Thu Jul 29 11:54:38 2004 Subject: Indium/glass seals In-Reply-To: <3.0.5.32.19980520085558.007bf860@orion> Message-ID: Posted to CCD-world: -+-+-+- Hi Roy, On Wed, 20 May 1998, Roy Tucker wrote: > I am contemplating trying to use indium to produce a hermetic > glass/metal seal around cryostat windows. I wonder if someone has tried > this and what results they had. Thank you very much for any help. Have a look at the following page, it is a useful starting point for information on this subject. http://belmont.astro.nwu.edu/DesIssue/indium.html The SPIRAC mid-IR camera at the South Pole uses indium seals to avoid problems with o-rings at low temperatures. It appears to work very well. The book by Roth on vacuum sealing techniques has lots of good advice for designing window seals. Some crucial things are the design of the retaining groove, applying pressure directly over the groove, and ensuring that the glass does not contact on point irregularities. Regards, Michael -- Michael Ashley; Department of Astrophysics, University of NSW; For further information: "finger mcba@newt.phys.unsw.edu.au" -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Wed May 20 08:55:58 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:38 2004 Subject: Indium/glass seals Message-ID: <3.0.5.32.19980520085558.007bf860@orion> Posted to CCD-world: -+-+-+- Hello Fellow Photon Foragers, I am contemplating trying to use indium to produce a hermetic glass/metal seal around cryostat windows. I wonder if someone has tried this and what results they had. Thank you very much for any help. - Roy Tucker -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ninkov at cis.rit.edu Fri May 8 08:23:17 1998 From: ninkov at cis.rit.edu (Zoran Ninkov) Date: Thu Jul 29 11:54:38 2004 Subject: Position References: <3.0.5.32.19980508134503.00911a30@mso.anu.edu.au> Message-ID: <3552F934.8FBDD07@cis.rit.edu> Posted to CCD-world: -+-+-+- If anyone in CCD-world knows of an instrumentation/detector person looking for a faculty position you may want to draw their attention to the position description attached below. Thanks, Zoran ---- Imaging Science - Faculty Position Description: The Chester F. Carlson Center for Imaging Science at the Rochester Institute of Technology is seeking candidates to fill a tenure-track faculty position (rank dependent on experience) to expand the Center?s ongoing research programs in astronomical and space instrumentation. Specific areas of current activity include the development of advanced focal-plane array detectors including CMOS Active Pixel Arrays, active optics, speckle imaging, infrared imaging and multiobject-multispectral imaging. Candidates with backgrounds in any of these areas or other related astronomical or space-based instrumentation are invited to apply. In addition, candidates with interests in developing instrumentation concepts for exploration of solar system objects are urged to apply. The successful applicant is expected to pursue an active research program supported by extramural funding. The applicant must be committed to teaching at both the undergraduate (BS) and graduate (MS and PhD) level, and to supervising graduate students. In addition to teaching in an area of specialization, the new faculty member should be prepared to offer courses in optics and optical instrumentation. RIT is located in Rochester, NY where many high technology companies with interests in sensors, optics and imaging hardware are located. CIS is well equipped with suitable computing and laboratory resources. The CMOS fabrication facility located in the Microelectronics Department on campus is used to fabricate prototype array sensors. Further information can be obtained at www.cis.rit.edu/research/astro/index.html . Send a resume in hard copy form, including e-mail address, to: IanGatley, Director, Chester F. Carlson Center for Imaging Science, 54 Lomb Memorial Drive, Rochester, New York 14623-5604. RIT is an Equal Opportunity Employer and actively encourages applications from women and minorities. Contact: Ian Gatley Rochester Institute of Technology Chester F. Carlson Center for Imaging Science 54 Lomb Memorial Drive Rochester, NY 14623-5604 USA Contact Phone: 716-475-6220 Fax: 716-475-5988 Email: ixgpci@rit.edu -- Dr. Zoran Ninkov Center for Imaging Science Rochester Institute of Technology 54 Lomb Memorial Drive Rochester NY 14623-5604 tel : 716 - 475 7195 fax : 716 - 475 5988 e-mail : ninkov@cis.rit.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From conroy at mso.anu.edu.au Fri May 8 13:45:03 1998 From: conroy at mso.anu.edu.au (Peter Conroy) Date: Thu Jul 29 11:54:38 2004 Subject: ln2 transfer hardware In-Reply-To: Message-ID: <3.0.5.32.19980508134503.00911a30@mso.anu.edu.au> Posted to CCD-world: -+-+-+- Hi >Due to requirements imposed by OSHA we will need to switch from rubber >tubing to >some form of OSHA approved liquid nitrogen transfer line. This in it self >is not a problem. We have been using Swagelock Teflon Hose for LN2 for about four years and it is excellent. We Typically use SS4BHT-36. The bore is smoooth and causes little friction to the liquid. The teflon inner is surrounded with stainless steel armor and even if the teflon breaks the line only dribbles LN2. The only way we have found to crack the teflon inner is to bend the tube sharply when it is very cold. We have tried the larger bore version of this tube and found it to be not so successful. Regards ----------------------------------------- Mr Peter Conroy Mt Stromlo Observatory The Australian National University Private Bag Weston Creek PO ACT 2611 AUSTRALIA Phone (W)61 6 279 8022 Fax 61 6 249 0233 Email conroy@mso.anu.edu.au ----------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mckenna at cfht.hawaii.edu Thu May 7 15:24:32 1998 From: mckenna at cfht.hawaii.edu (DAN MCKENNA) Date: Thu Jul 29 11:54:38 2004 Subject: ln2 transfer hardware Message-ID: Posted to CCD-world: -+-+-+- Dear CCD chiefs and warriors, Due to requirements imposed by OSHA we will need to switch from rubber tubing to some form of OSHA approved liquid nitrogen transfer line. This in it self is not a problem. What I need to find is a fitting that has a low pressure drop and is easy to connect and disconnect and requires no tools for the connect /disconnect. Does any one out there know of such fittings. Thank you for your time Dan McKenna mckenna@cfht.hawaii.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From Les.Saddlemyer at hia.nrc.ca Thu May 7 16:39:45 1998 From: Les.Saddlemyer at hia.nrc.ca (Les Saddlemyer) Date: Thu Jul 29 11:54:38 2004 Subject: Cryotiger cooler query Message-ID: <199805072339.QAA04004@sooke.dao.nrc.ca> Posted to CCD-world: -+-+-+- Tim, We are in the process of installing an APD "Cryotiger". We've used LN2 dewars until now, and are looking for the advantages one would expect. We should be trying it in about 2 weeks for the first time. We, however, have a thermally isolated room (i.e. insulated equipment room) where we'll run the compressor. Are you concerned about damaging the compressor or about heat in the dome? With the 'self heating' nature of the compressor, a simple enclosure would permit it to run at closer to room temperature. What does the manufacturor say? Call me if you would like to talk. Cheers, Les Leslie Saddlemyer Research Officer, National Research Council Voice: 250 363-0060 Pacific Time Dominion Astrophysical Observatory FAX: 250 363-0045 5071 West Saanich Road Email: Leslie.Saddlemyer@hia.nrc.ca Victoria, B.C. V8X 4M6 CANADA -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mckay at sdss1.physics.lsa.umich.edu Thu May 7 07:42:37 1998 From: mckay at sdss1.physics.lsa.umich.edu (Tim Mckay) Date: Thu Jul 29 11:54:38 2004 Subject: Cryotiger cooler query Message-ID: Posted to CCD-world: -+-+-+- We are considering installation of an APD "Cryotiger" closed cycle cooler on a CCD system. It would be very helpful to hear from anyone who has already implemented one of these systems for an astronomical imaging application. I am particularly interested in what is known about running the compressor for long periods in unheated domes. Thanks, Tim McKay ++++++++++++++++++++++++++++++++++++++++++ Timothy A. McKay, Assistant Professor Randall Physics Lab, University of Michigan 500 East University, Ann Arbor, MI 48109 tamckay@umich.edu (734)763-1462 Fax:(734)936-1817 ++++++++++++++++++++++++++++++++++++++++++ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From EGREISCH at RIA-EMH2.ARMY.MIL Wed Apr 29 15:09:43 1998 From: EGREISCH at RIA-EMH2.ARMY.MIL (EGREISCH@RIA-EMH2.ARMY.MIL) Date: Thu Jul 29 11:54:38 2004 Subject: Beta lights Message-ID: <002EF05C.1319@RIA-EMH2.ARMY.MIL> Posted to CCD-world: -+-+-+- We are removing beta lights from cannon sight systems because, after they break, the glass gradually releases sponged-up tritium. The tritium, being a super-leaky substance, leaks into people who collect broken beta lights in their offices. Glass is more of a sponge than a container for hydrogen gas. Has anyone made beta lights in which the tritium is part of a solid chemical compound? That would be the only way to keep the tritium "contained". Ed Greisch egreisch@ria-emh2.army.mil -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From Les.Saddlemyer at hia.nrc.ca Wed Apr 29 07:22:37 1998 From: Les.Saddlemyer at hia.nrc.ca (Les Saddlemyer) Date: Thu Jul 29 11:54:38 2004 Subject: Acquisition of a grade 1 SITe TK1024 device Message-ID: <199804291422.HAA10740@sooke.dao.nrc.ca> Posted to CCD-world: -+-+-+- Hello, We are looking for a Grade 1 SITe TK1024 CCD to replace a failed device on one of our telescopes. We are currently using our backup Grade 2 chip. SITe no longer has any left; they stopped producing these when they brought out their SI003 1024^2 upgrade. They only have a selection of Grade 2 TK1024 chips left. We'd appreciate hearing from anyone that might know of an available device. Cheers, Les Leslie Saddlemyer Research Officer, National Research Council Voice: 250 363-0060 Pacific Time Dominion Astrophysical Observatory FAX: 250 363-0045 5071 West Saanich Road Email: Leslie.Saddlemyer@hia.nrc.ca Victoria, B.C. V8X 4M6 CANADA -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From reif at astro.uni-bonn.de Tue Apr 28 12:28:12 1998 From: reif at astro.uni-bonn.de (Klaus Reif) Date: Thu Jul 29 11:54:38 2004 Subject: Large aperture shutters Message-ID: <3.0.5.32.19980428122812.007d6210@aibn55> Posted to CCD-world: -+-+-+- Sorry Michael, there was a mistake in my last email. It should read: ....As Michael mentioned, short exposure times are appreciated very much by astronomers... Klaus -------------------------------------------------------------- Klaus Reif e-mail: reif@astro.uni-bonn.de Sternwarte, http://www.astro.uni-bonn.de/~reif University of Bonn Tel: +49-228-737834 FAX: +49-228-733672 Auf dem Huegel 71 D-53121 Bonn Germany ---------------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From reif at astro.uni-bonn.de Tue Apr 28 12:23:21 1998 From: reif at astro.uni-bonn.de (Klaus Reif) Date: Thu Jul 29 11:54:38 2004 Subject: Large Aperture Shutter In-Reply-To: References: <199804271308.JAA08241@pcnet1.pcnet.com> Message-ID: <3.0.5.32.19980428122321.007d1700@aibn55> Posted to CCD-world: -+-+-+- Shutter friends, we have designed our own large aperture shutter (110mm x 110mm aperture) for BUSCA for the same obvious reasons. (BUSCA = Bonn University Simultaneous CAmera: a camera system for simultaneaous 4-colour CCD imaging.) We are moving two carbon fiber plates across the aperture. One for opening, one for closing. The operation can be performed in either direction (from left to right and vice versa). Each plate has its own stepper motor driven by microcontroller based electronics. Velocity profiles are programmable. This concept allows very short exposure times at high precision. This was of course a major goal. As Johannes mentioned, short exposure times are appreciated very much by astronomers as it extends the time during which sky flats can be taken at the begin or end of a night. With our prototype shutter we still find residual inhomogeneities of 1 to 2 ms (PP). 1ms or less should be possible. There is virtually no lower limit for the exposure time. We have measured down to 3ms. The exposure procedure itself takes less than 0.5 sec. I would like to see more about similar or other shutter concepts. Klaus Reif -------------------------------------------------------------- Klaus Reif e-mail: reif@astro.uni-bonn.de Sternwarte, http://www.astro.uni-bonn.de/~reif University of Bonn Tel: +49-228-737834 FAX: +49-228-733672 Auf dem Huegel 71 D-53121 Bonn Germany ---------------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Tue Apr 28 02:42:01 1998 From: MYPIXEL at aol.com (MY PIXEL) Date: Thu Jul 29 11:54:38 2004 Subject: LOST EMAIL Message-ID: <12944861.35457a3b@aol.com> Posted to CCD-world: -+-+-+- (Moderator's note - I already passed Chris Tinney's email address to Jim Janesick...) ************jj Does anyone have Chris Tinney e-mail (AAO, Austrialia) so e-mail below can be eventually forwarded to Reima Saarela.. . ? Thanks Jim ***************jj In a message dated 98-04-20 11:57:58 EDT, staceye@pvinc.com writes: From: Ray Sent: Sunday, April 19, 1998 9:15 PM To: info@pv-inc.com Subject: To: Janesick ( hopefully please ! ) / Lumogen coating method ... Hi, my name is Reima Saarela, I am an M.Sc CS/EE student in Tampere University of Technology Finland, and am in US due to my wife's health care studies in Tucson. *************jj Glad to meet you .. . . *************jj I am doing M.Sc thesis of UV-spectroscopy, and I am developing fotodiode-array UV spectroscope with meager self-funding, really low budget. Basically I am designing a whole small unit, electronics, software, and optics, little by little, with micro budget and macro-efforts ... I have learned that BASF's lumogen, Photometric's metachrome, some other phosphors and polymers might be suitable +for UV-coating the arrays I need to turn into unexpensive UV arrays. ***************jj We coated Space Telescope CCDs with Lumigen. In fact the CCD headed to Saturn (Cassini) is also coated. These are very expensive camera systems . . so if lumigen good for them it should do the job for you. ****************jj Now, I have heard various opinions/rumours about how to perform the coating, but I was recommended by AAO Australia Chris Tinney to try to contact Jim Janesick at JPL, but I found out that now Jim Janesick is leading your company. That is why I am targeting this request to you, could you please ask Jim Janesick if he would be willing to breafly describe me a working method how to deposit the lumogen on the arrays I have. ****************jj I can send a formal recipe . .. ****************jj Lumogen is available from BASF and various pigment dealers for sure, have friend in Germany ... Now, I have developed idea based on some hints I have heard, something like motorized spinning bed under vacuum with heated CCD-socket for the array and heat-vapourizing the lumogen perhaps under vacuum with electrodes to create a little "lumogen arc" lamp during the lumogen deposition period. I have fairly good picture in my mind how I would implement most of it, but as I would really appreciate the method Mr Janesick has described to for example Chris Tinney while he was working at JPL, if possible, so that I would know what parameters I would need to control, and how far off my idea is from reality. Of course, I dream of something simple like using felt tip pen with solvent solubilized lumogen instead of having to build the rotating monster under vacuum, but,as I am unexperienced with this, I really could afford some help from Mr. Janesick in case he is not too busy to help me, or someone else who knows of the deposition method ... ************jj The pen will give you some QE. . . vacuum deposition at 80 C is best about 6000 A thick. Space Telescope achieves 15 % QE down to 500 A wavelength. **************jj Thanx. Reima S, M.Sc. student. ****************jj Please send mailing address for recipe . . . I'll need to send it by mail. Thanks for your interest . . . *****************jj -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From andersen at not.iac.es Mon Apr 27 23:35:35 1998 From: andersen at not.iac.es (Michael Andersen) Date: Thu Jul 29 11:54:38 2004 Subject: Large Aperture Shutter In-Reply-To: <199804271308.JAA08241@pcnet1.pcnet.com> Message-ID: Posted to CCD-world: -+-+-+- Bruce and others! I was absent during the shutter discussion. I just want to mention the shutters we use. It is simply a thin disk (some kind of black plastic plate) mounted on a stepper motor shaft, with two 90deg sectors cut out. The motor is turned 1/4 turn to open and another 1/4 turn in same direction to close. For a single 2k Loral CCD (30.7mm square) we have a minimum exposure time of 0.3sec. The shutter timing is constant to 1msec peak to peak over the field (0.3% at minimum exp time). Thus people are happily taking flats shorter than a second. The minimum exp time may be shortened significantly by moving the disk across the aperture at constant speed - we might want to impelment this for larger apertures. Cheers, Michael -------------------------------------------------------------------------------- Michael I. Andersen Support Astronomer, Nordic Optical Telescope Apatado 474, Santa Cruz de La Palma, E-38700 Office, sea level : +34 22 42 54 70 Fax, sea level : +34 22 42 54 75 Telescope : +34 22 40 56 60 Service building : +34 22 40 56 62 Home : +34 22 41 66 85 -------------------------------------------------------------------------------- -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From brucet at pcnet.com Mon Apr 27 09:12:37 1998 From: brucet at pcnet.com (Bruce Truax) Date: Thu Jul 29 11:54:38 2004 Subject: Large Aperture Shutter Message-ID: <199804271308.JAA08241@pcnet1.pcnet.com> Posted to CCD-world: -+-+-+- When I saw the discussion a few weeks ago concerning large aperture shutters we were in the middle of testing the large aperture shutter we designed for our mosaic camera. We completed our bench testing last week and the results are very encouraging. On the Calypso telescope we have a mosaic imager consisting of a 2 x 2 array of 2048 square Loral chips with 15 micron pixels. We needed a shutter with a 75 mm square clear aperture. Since we plan to do photometry we also wanted a shutter which would have uniform exposure across the entire aperture. We were unable to find a suitable leaf shutter so we decided to design our own "focal plane" shutter. Our shutter consists of a 50 micron thick stainless steel shutter web which has a rectangular aperture 75 mm wide and 150 mm long. The web is wound onto two rollers on opposites sides of the aperture. Each roller is driven by a DC torque motor under servo control. For long exposures the web is translated to the center of the opening and stopped. Once the exposure is complete the web resumes motion in the same direction until the aperture is fully closed. For short exposures the shutter web runs at a constant velocity providing an equal exposure for the entire field. Our bench test results are very encouraging. For exposures of 1 second or longer the exposure time was accurate to better than 1% across the entire field. We have some exposure time variation (~2-3% for shorter exposures) which we believe we can reduce once we have optimized the servo tuning. Another advantage of this shutter is that it is almost completely inertia compensated. This was done by running the two rollers in opposite directions. The only uncompensated inertia is that of the 50 micron thick stainless steel web. This shutter is scalable to larger size apertures. There is no reason why we could not make it work with a 6" square or larger aperture. I would be happy to provide more information for anyone who is interested. ____________________________________________________________ Bruce E. Truax Calypso Telescope Truax Associates email: brucet@pcnet.com 388 Wedgewood Road voice: 860-276-0450 Southington, CT 06489 fax: 860-620-9026 _____________________________________________________________ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mac at astro.Princeton.EDU Thu Apr 23 08:03:46 1998 From: mac at astro.Princeton.EDU (Mike Carr) Date: Thu Jul 29 11:54:38 2004 Subject: cheap fast camera! Message-ID: <199804231203.IAA02542@tama.Princeton.EDU> Posted to CCD-world: -+-+-+- Graham You might want to check out Pixel Vision. They are related technically to SITe. They have a camera that can run at the rate you mentioned. 503-629-3210 http://www.pv-inc.com/ MICHAEL -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mgb at ast.cam.ac.uk Thu Apr 23 08:16:25 1998 From: mgb at ast.cam.ac.uk (Martin Beckett) Date: Thu Jul 29 11:54:38 2004 Subject: cheap fast camera! References: Message-ID: <353EEAC9.412D@ast.cam.ac.uk> Posted to CCD-world: -+-+-+- Graham Cox wrote: > > important criteria is that we get a resolution of around a few hundred > pixels and can read the whole chip at several hundred hertz and the > tricky bit, be operated under Unix (Linux). There was a company at the Kona SPIE conference with a CCD camera and a suite of Linux software. Called "Apogee Instruments" and "Clear Sky Institute" Tel 319-848-8244 or www.ClearSkyInstitute.Com I don't have any experience of the system but the people I talked to seemed fairly competent. You could also do a web search, I am sure that people will have written Linux drivers for most of the popular amatuer cameras. Martin -------------------------------------------------------------------- Martin Beckett, Institute of Astronomy, University of Cambridge Tel: 01223 337093 Fax: 01223 330804 Email: mgb@ast.cam.ac.uk -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From cox at not.iac.es Wed Apr 22 12:18:32 1998 From: cox at not.iac.es (Graham Cox) Date: Thu Jul 29 11:54:38 2004 Subject: cheap fast camera! Message-ID: Posted to CCD-world: -+-+-+- Hi all, I'm not sure if this is the right forum to ask this question but I'm going to anyway. We (at the NOT) are interested in purchasing/acquiring a cheap ccd camera for the application of fringe tracking and also possibly seeing monitoring. For the main application of fringe tracking the light will be from a laser so signal-to-noise will not be a major concern. The important criteria is that we get a resolution of around a few hundred pixels and can read the whole chip at several hundred hertz and the tricky bit, be operated under Unix (Linux). This last point eliminates most cheap commercial cameras because they only provide drivers for Windows95, and they usually can't operate at high frame rates. If anyone can suggest a source we would be grateful. Bye, Graham Cox -- Graham C. Cox Nordic Optical Telescope Work +34 922 425474 / 405664 Apartado 474 FAX +34 922 425475 / 404665 E-38700 Santa Cruz de La Palma Canarias, Spain Email cox@not.iac.es -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From dirk.viehmann at dss.dornier.dasa.de Wed Apr 22 09:49:21 1998 From: dirk.viehmann at dss.dornier.dasa.de (Dirk Viehmann +49 89 607 23755) Date: Thu Jul 29 11:54:38 2004 Subject: New CCD / APS Page Message-ID: <353DA101.6EEB60B5@dss.dornier.dasa.de> Posted to CCD-world: -+-+-+- The CCD Stammtisch in munich changed its name to Camera Stammtisch and has a non comercial CCD / APS Camera related homepage up to now it is only in german, but diskussions can also be held in english. try it: http://www.cameras.de/cameras/ kind regards dirk __\/__ . / _ _ \ . [\| (o)(o) |/] @-----------.OOOo---()----oOOO.------------@ @ Dirk Viehmann @ @ Dornier Satellitensysteme GmbH @ @ fon: +49-89-607-23755, fax: -35180 @ @ Mailto:viehmann@cameras.de @ @______________________Oooo._______________@ .oooO \( ) ( ) \) / \ (| (_/ \_) -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From apo at ast.cam.ac.uk Wed Apr 8 12:53:31 1998 From: apo at ast.cam.ac.uk (Captain PeekHard) Date: Thu Jul 29 11:54:39 2004 Subject: Latest EEV data Message-ID: <352B653B.78CA@ast.cam.ac.uk> Posted to CCD-world: -+-+-+- Hi CCD out-worlders Just a quick note to say I havent beamed off planet ... YET. Yes I am still here and sorry I didnt make the KONA bash. Im afraid I am in RePoM (try and guess). I have put another section on the Web Page showing a couple of images from the 4-chip Wide Field Camera which has just been re-commisioned on the 2.5m INT. Take a look... Looks impressive but I hear their are even bigger beasts out there. We now have 5 of these devices at the WHT and INT. I have another head in advanced preparation and it should be out on the Island in the next few weeks... Paddy -- --Surfing in CyberSpace on the Wings of a Storm----| apo@ast.cam.ac.uk +44 (0)1223 374836(T) 374700(F) | www.ast.cam.ac.uk/~apo/docs/ccds.html | www.tightfit.demon.co.uk/Images.html | DiGiTaL MaGiK, digimag@tightfit.demon.co.uk | ---------------------------------------------------/ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From MYPIXEL at aol.com Tue Apr 7 03:57:25 1998 From: MYPIXEL at aol.com (MY PIXEL) Date: Thu Jul 29 11:54:39 2004 Subject: e-/DN Uncertainty Message-ID: <2dbb9bcc.3529dc66@aol.com> Posted to CCD-world: -+-+-+- Never say die .. . . The original calculation performed 10/17/84 on e-/DN variance appears correct. That is, ************ Uncertainty in K(e-/DN) = (2 / Np)^1/2 x K(e-/DN) where Np is the number of pixels sampled and assuming that 1). 1/S(DN) << 2K(e-/DN) where S(DN) is the average signal level 2). Read noise is negligible Note that the uncertainty of e-/DN is independent of signal level which has caused recent arguments. I can send out a FAX of proper derivation and data products for those interested. Sorry for the confusion . . . Jim Janesick -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From roger at ctios1.ctio.noao.edu Tue Apr 7 12:46:39 1998 From: roger at ctios1.ctio.noao.edu (roger smith x294) Date: Thu Jul 29 11:54:39 2004 Subject: Thermal resistance of bond wires Message-ID: <199804071646.JAA23910@noao.edu> Posted to CCD-world: -+-+-+- Dear CCD-World, I'm re-designing a CCD mount and was wondering if you have ever compared the thermal resistance of a CCD's electrical connections (pins, bond wires and pads) to spring contact between the heater plate and the back of the CCD package. Could the pins serve as the primary thermal connection, or at least significant secondary one ? Years ago I did this successfully for several IR detectors, but radiative loads were much lower due to the smaller area. The CCD in this case is a SITe 2K in a conventional "tray-style" package but I would be happy to hear of experience with any type of CCD or IR detector. Roger Smith, CTIO -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From douellette at as.arizona.edu Wed Mar 11 14:47:25 1998 From: douellette at as.arizona.edu (David Ouellette) Date: Thu Jul 29 11:54:39 2004 Subject: shutters Message-ID: <01BD4CF4.3A519C00@aspc77.as.arizona.edu> Posted to CCD-world: -+-+-+- I had some experience with 6 inch aperture Bencher shutters many years ago for a non-CCD application. In general it was a painful experience. They failed to operate reliably at the telescope in the winter; the linkages wore out very quickly; and the leaf pivots wore out, all in about 1 year with a duty cycle an order of magnitude less than a CCD exposure control shutter would go through. I can't say I'd recommend them, but that was a long time ago and things may have changed. I was fortunate enough to land a 6 inch shutter from the military surplus piles. It had no mechanical driver associated with it, so I had to make that, but as a starting point it was/is a wonderful device-- 12 leaves, very smooth. Originally used for aerial photography I think. Maybe some day we'll come up with a "standardized" large aperture shutter...?? Dave David Ouellette Steward Observatory CCD Laboratory University of Arizona Tucson, AZ 85721-0065 douellette@as.arizona.edu Phone (520) 621-5228 Fax 626-4330 Web Page http://sauron.as.arizona.edu/ccdlab/ -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From stubbs at lensing.astro.washington.edu Wed Mar 11 12:19:14 1998 From: stubbs at lensing.astro.washington.edu (Chris Stubbs) Date: Thu Jul 29 11:54:39 2004 Subject: extended dynamic range for CCD instruments. Message-ID: <199803111919.LAA21075@lensing.astro.washington.edu> Posted to CCD-world: -+-+-+- hi Craig (and others) Apologies for our ignorance of your earlier work on this. Glad to know it works!! We are planning on incorporating this idea into a mosaic CCD camera we're building... All the best, Chris. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From geary at cfa.harvard.edu Wed Mar 11 17:46:13 1998 From: geary at cfa.harvard.edu (John Geary) Date: Thu Jul 29 11:54:39 2004 Subject: job posting Message-ID: <199803112146.QAA14704@jupiter.harvard.edu> -------------- next part -------------- POSITION OPEN: Calypso High Resolution Telescope Kitt Peak, Arizona Observatory Manager/Telescope Operator Maintain and operate an advanced technology 1.2M high resolution telescope. Initial instruments include a 10 arcmin FOV camera with four 2K X 2K chips, and a tip-tilt adaptive optics camera. Position involves operating the telescope and assisting astronomers during observation periods. Network administration and maintenance required. Mostly in-house developed control software. Must accept clear-cut responsibility. Attractive compensation commensurate with capabilities and experience. Candidate should have a degree in astronomy, physics, engineering, or computer science and an interest in astronomy. Experience working on other telescopes is highly desirable. A good working knowledge of the UNIX operating system is a must. Knowledge in VMS, DOS, Windows 95, and C/C ++ programming useful. Basic understanding of electronic circuits and optics also beneficial. Some electrical and mechanical maintenance/repair work and optical alignment required. Interested candidates should preferably fax or e-mail resume to: Bruce E. Truax, Tel:(860) 276-0450 Project Manager Fax:(860) 620-9026 388 Wedgewood Road email:brucet.pcnet.com Southington, CT 06489 and Edgar O. Smith Tel: (2l2) 757-6565 Suite 3502 Fax:(2l2) 750-5l07 375 Park Avenue email:edgar@astro.columbia.edu New York, NY 10152 From starr Wed Mar 11 11:24:45 1998 From: starr (Barry Starr) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters In-Reply-To: <3.0.5.32.19980311103809.007f8c10@orion> from "Roy Tucker" at Mar 11, 98 10:38:09 am Message-ID: <199803112024.AA02166@uwila.cfht.hawaii.edu> A non-text attachment was scrubbed... Name: not available Type: text Size: 1733 bytes Desc: not available Url : http://www.ctio.noao.edu/pipermail/ccd-world/attachments/19980311/92a6035b/attachment.bat From mckenna Wed Mar 11 10:38:12 1998 From: mckenna (DAN MCKENNA) Date: Thu Jul 29 11:54:39 2004 Subject: Molecular sieve and similar materials In-Reply-To: <3.0.5.32.19980311085421.007fade0@orion> Message-ID: Posted to CCD-world: -+-+-+- Roy, Activated Charcoal is a physisorption getter . Its adsorption as a function of temperature follows the vapor pressure curve of the gas under consideration. For example H20 has a vapor pressure of 10 ^-16 torr at 77k and 3 *10^-6 at 173K (-100C). Next is CO2 10^-8 torr at 77K and 10 torr at 173K . I have found that the dust created by thermal cycling is a problem for these kinds of getters . We are testing a ceramic to see if it is more pratical. There is a company that builds custom getters SAES Getters (719) 576-3200 They sell both chemisorption and physisorption devices. In general one needs to heat chemisorption getters to a much higher temperature to regenerate > 400C. Dan mckenna@cfht.hawaii.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From harrison at ll.mit.edu Wed Mar 11 14:49:28 1998 From: harrison at ll.mit.edu (Harrison, David) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters Message-ID: <9803111349.AA22651@LL.MIT.EDU> Posted to CCD-world: -+-+-+- I was faced with this about 14 years ago when I needed an 80 mm opening. I had to design and build a multi-blade shutter similar to a Copal camera shutter. Mine was slow, about 0.5 seconds, but was used mostly for getting a good black reference in a system with seconds of integration time. We built it with three thin steel blades that overlapped for good light blockage and short optical axis dimension; we had an interfering corrector lens near the camera window. Its main problem was that the frames exposed during shutter operation had more integration time in the center than at the edges, although this was not critical for us, as we threw those away. If you have decent mechanical engineering backup, show him/her a viewcamera shutter and explain how you want it to be made in a larger size. If you are your own backup, look at one yourself and start thinking. They only seem complicated at first blush, then they look impossible, but gradually it will make sense. Dave Harrison > ---------- > From: Roy Tucker > Reply To: CCD-world@cfht.hawaii.edu > Sent: Wednesday, March 11, 1998 1:38 PM > To: CCD-world@cfht.hawaii.edu > Subject: Camera shutters > > Posted to CCD-world: > -+-+-+- > Dear Fellow Photon Foragers, > I've been using the usual Uniblitz shutters for smaller imagers up to > the SITe TK1024. Their selection on shutters has a maximum aperture of 45 > millimeters. Can anyone suggest a manufacturer of larger shutters or > indicate what they use for shuttering large arrays? Thanks. > - Roy Tucker > > > -+-+-+- > For information about CCD-world, send email to > owner-CCD-world@cfht.hawaii.edu. > -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From cdm at ast.cam.ac.uk Wed Mar 11 19:47:12 1998 From: cdm at ast.cam.ac.uk (Craig D Mackay) Date: Thu Jul 29 11:54:39 2004 Subject: extended dynamic range for CCD instruments. References: <199803042314.PAA07660@lensing.astro.washington.edu> Message-ID: <3506DC30.2FA8@ast.cam.ac.uk> Posted to CCD-world: -+-+-+- Dear Chris The use of dual ADCs to increase dynamic range was, I think, first used in the AstroCam 4220 controller that was first marketed around 1990. The way of using two ADCs was described in a paper I wrote for the Feb 93 Jan Jose meeting, and can be found in SPIE vol 1900, p12. The method you describe is exactly what we used. It works well provided you merge the two 16-bit values carefully where they overlap. The method is particularly used by laboratory spectroscopists who do full parallel binning into the output register and can easily get a full well in excess of 1,000,000 electrons with CCDs that have a read noise of 3 or 4 electrons. Best Wishes Craig D Mackay Chris Stubbs wrote: > > Posted to CCD-world: > -+-+-+- > > Greetings. > > A while ago there was some exchange of messages about realizing the > full dynamic range of CCD's... We have a very brief write-up on > a scheme that should allow read-noise and shot-noise limited performance > up to the entire binned full well depth of a CCD detector, using dual > A/D converters. > > I have put a PDF file of the write-up at the very bottom of my > web page, http://www.astro.washington.edu/stubbs. > > Christopher Stubbs > University of Washington. > > -+-+-+- > For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From dbaxter at as.arizona.edu Wed Mar 11 12:26:36 1998 From: dbaxter at as.arizona.edu (Dave Baxter) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters Message-ID: <9803111830.AA00027@frodo.as.arizona.edu> Posted to CCD-world: -+-+-+- Roy- We at Steward Observatory are using Prontor shutter in the 4" and 6" size. they work very good but are a little slow ( 60 msec min exposure). they also need a good driver for them. We had to build our own as the one the use for the 4" didn't last very long with the long exposure times we use. The cost is about $1000 for the 4" and $2000 for the 6". They can be purchased through: Geiss-America 4821 W. Main St. Skokie, ILL 60077 Ph. (312) 674-5800 Dave Baxter dbaxter@as.arizona.edu Sr. Staff Technician University of Arizona Steward Observatory Tucson, Arizona 85721 ---------- > From: Roy Tucker > To: CCD-world@cfht.hawaii.edu > Subject: Camera shutters > Date: Wednesday, March 11, 1998 10:38 AM > > Posted to CCD-world: > -+-+-+- > Dear Fellow Photon Foragers, > I've been using the usual Uniblitz shutters for smaller imagers up to > the SITe TK1024. Their selection on shutters has a maximum aperture of 45 > millimeters. Can anyone suggest a manufacturer of larger shutters or > indicate what they use for shuttering large arrays? Thanks. > - Roy Tucker > > > -+-+-+- > For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mckenna Wed Mar 11 09:26:08 1998 From: mckenna (DAN MCKENNA) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters In-Reply-To: <3.0.5.32.19980311103809.007f8c10@orion> Message-ID: Posted to CCD-world: -+-+-+- Roy, At CFHT we have switched to prontor shutters. In order to reduce the heating in the open state we use our own shutter driver. Bencher also makes shutters from 2" to 5" in diameter. Bencher (708) 238-1183 (sorry no number for prontor) In general, shutter vendors don't address the temperature rise during a long exposure so usually some rework is needed. Dan mckenna@cfht.hawaii.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mac at astro.Princeton.EDU Wed Mar 11 14:25:57 1998 From: mac at astro.Princeton.EDU (Mike Carr) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters Message-ID: <199803111825.NAA13769@tama.Princeton.EDU> Posted to CCD-world: -+-+-+- Hi Roy I understand your problem with large apertures. As far as I know there is not a good "photometric shutter" for purchase these days. If you are not interested in photometric quality, I could come up with something a little later (not today). I have designed and built them in the past, one for Norris Spectrograph @ Palomar, and LRIS @ Keck 10M, and another one for Max-Planck, Heidelberg, for a Phillips 7K X 9K and others. I know shutters, and I plan to design one as soon as I can find a window (time) to do it. It is a tremendiously difficult mechanism. It has to be a small footprint, short in Z depth, lightweight, fast without sending motions through the system, easy logic to control, minimal cost, and trouble free too! This is why there is nothing out there. But I do plan (and have been planning) to design one in the near future. If you are interested, I will try to remember to notify you if you like. MICHAEL CARR SDSS Project -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Wed Mar 11 11:38:09 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:39 2004 Subject: Camera shutters Message-ID: <3.0.5.32.19980311103809.007f8c10@orion> Posted to CCD-world: -+-+-+- Dear Fellow Photon Foragers, I've been using the usual Uniblitz shutters for smaller imagers up to the SITe TK1024. Their selection on shutters has a maximum aperture of 45 millimeters. Can anyone suggest a manufacturer of larger shutters or indicate what they use for shuttering large arrays? Thanks. - Roy Tucker -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Wed Mar 11 09:54:21 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:39 2004 Subject: Molecular sieve and similar materials Message-ID: <3.0.5.32.19980311085421.007fade0@orion> Posted to CCD-world: -+-+-+- Dear Fellow Vacuum Enthusiasts, Substances such as Linde 13X molecular sieve and coconut shell charcoal are good adsorption agents at liquid nitrogen temperatures. Can anyone direct me to data that gives the adsorption efficiency of these and similar substances at higher temperatures in the vicinity of -100C? Thanks for any help. - Roy Tucker -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Tue Mar 10 17:58:23 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:39 2004 Subject: permeability of elastomers Message-ID: <3.0.5.32.19980310165823.007fd610@orion> Posted to CCD-world: -+-+-+- Dear Fellow Vacuum Enthusiasts, I have managed to find some numbers regarding diffusion rates of various gases through various elastomers from some Parker Seals publications but it's not terribly complete. Can someone recommend a good source of such data, especially with regard to Butyl and Fluorocarbon elastomers such as one might use for vacuum sealing applications. Thanks! - Roy Tucker, NOAO -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mlesser at as.arizona.edu Thu Mar 5 08:29:51 1998 From: mlesser at as.arizona.edu (Michael Lesser) Date: Thu Jul 29 11:54:39 2004 Subject: Philips FTT1010 In-Reply-To: <3.0.32.19980304134832.009ee4c0@pop.jpl.nasa.gov> Message-ID: <199803051428.HAA25777@bilbo.as.arizona.edu> Posted to CCD-world: -+-+-+- HI Mark, I have many FTT1010 CCDs here, they were on the edges of the 7kx9k CCDs we process. I diced 8 devices 2 years ago and sent them to several groups for testing. I have not run them myself, but the reports back were they CCCCCCCCworked well. -Mike -----Original Message----- From: Mark V. Wadsworth [mailto:mwadswor@mail1.jpl.nasa.gov] Sent: Wednesday, March 04, 1998 2:49 PM To: CCD-world@cfht.hawaii.edu Subject: Philips FTT1010 Posted to CCD-world: -+-+-+- To CCD World: Has anyone out there had any experience with the Philips FTT1010 1024 x 1024 frame transfer CCD? The part is designed for video applications but the spec sheet indicates that it would likely make a reasonable scientific imager (if you are willing to overlook the low QE). Regards, Mark Mark V. Wadsworth, Ph.D. Charge Coupled Device Technology Group Space Instruments Implementation Section Jet Propulsion Laboratory 4800 Oak Grove Drive Mail Stop 300-315 Pasadena, CA 91109-8099 Office: 818 354-7833 FAX: 818 393-0045 email: Mark.V.Wadsworth@jpl.nasa.gov -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From stubbs at lensing.astro.washington.edu Wed Mar 4 16:14:40 1998 From: stubbs at lensing.astro.washington.edu (Chris Stubbs) Date: Thu Jul 29 11:54:39 2004 Subject: extended dynamic range for CCD instruments. Message-ID: <199803042314.PAA07660@lensing.astro.washington.edu> Posted to CCD-world: -+-+-+- Greetings. A while ago there was some exchange of messages about realizing the full dynamic range of CCD's... We have a very brief write-up on a scheme that should allow read-noise and shot-noise limited performance up to the entire binned full well depth of a CCD detector, using dual A/D converters. I have put a PDF file of the write-up at the very bottom of my web page, http://www.astro.washington.edu/stubbs. Christopher Stubbs University of Washington. -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tucker at noao.edu Wed Mar 4 17:43:55 1998 From: tucker at noao.edu (Roy Tucker) Date: Thu Jul 29 11:54:39 2004 Subject: objective prisms Message-ID: <3.0.5.32.19980304164355.007f4890@orion> Posted to CCD-world: -+-+-+- Dear Fellow Photon Foragers, I have been contemplating the purchase of a relatively small (5.25" diameter) objective prism for experimental and educational purposes. As you might expect, they're cheaper in quantity than singly. Would anyone else be interested in getting one as well? Material would be BK-7. Dispersion is negotiable. Cost is expected to be in the $200-300 range. This would be a relatively inexpensive way of introducing astronomy students to astronomical spectroscopy with modest sized telescopes and CCD cameras. Thanks. Roy Tucker -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ger at hokupa.IFA.Hawaii.Edu Wed Mar 4 14:15:38 1998 From: ger at hokupa.IFA.Hawaii.Edu (Gerard Luppino) Date: Thu Jul 29 11:54:40 2004 Subject: Philips FTT1010 Message-ID: <199803042315.NAA08703@hokupa.ifa.hawaii.edu> Posted to CCD-world: -+-+-+- oops -- sorry 'bout that... Haven't done that in awhile. ...sheepishly, Gerry Luppino -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From ger at hokupa.IFA.Hawaii.Edu Wed Mar 4 14:02:46 1998 From: ger at hokupa.IFA.Hawaii.Edu (Gerard Luppino) Date: Thu Jul 29 11:54:40 2004 Subject: Philips FTT1010 Message-ID: <199803042302.NAA08684@hokupa.ifa.hawaii.edu> Posted to CCD-world: -+-+-+- Hi Mark, Just saying HI! Remember me when I was at MIT and we played with TI-4849 CCDs? Hope all is well. Aloha, Gerry Luppino -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mwadswor at mail1.jpl.nasa.gov Wed Mar 4 14:48:32 1998 From: mwadswor at mail1.jpl.nasa.gov (Mark V. Wadsworth) Date: Thu Jul 29 11:54:40 2004 Subject: Philips FTT1010 Message-ID: <3.0.32.19980304134832.009ee4c0@pop.jpl.nasa.gov> Posted to CCD-world: -+-+-+- To CCD World: Has anyone out there had any experience with the Philips FTT1010 1024 x 1024 frame transfer CCD? The part is designed for video applications but the spec sheet indicates that it would likely make a reasonable scientific imager (if you are willing to overlook the low QE). Regards, Mark Mark V. Wadsworth, Ph.D. Charge Coupled Device Technology Group Space Instruments Implementation Section Jet Propulsion Laboratory 4800 Oak Grove Drive Mail Stop 300-315 Pasadena, CA 91109-8099 Office: 818 354-7833 FAX: 818 393-0045 email: Mark.V.Wadsworth@jpl.nasa.gov -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From afa at star.le.ac.uk Wed Feb 25 16:43:53 1998 From: afa at star.le.ac.uk (Tony Abbey) Date: Thu Jul 29 11:54:40 2004 Subject: dewar wiring In-Reply-To: Message-ID: Posted to CCD-world: -+-+-+- > Posted to CCD-world: > -+-+-+- > Andre, & CCD-world, > > > We are replacing the constantan wiring in a dewar by the copper > > wiring. Wondering whether there is any reason to use something else > > than ordinary insulated multi-strand wire ? > > The CCD packages we have designed in partnership with EEV for use on the European Photon Imaging Camera on ESA's Xray Multi Mirror satellite use an aluminium block with an invar plate topped with an insulating aluminised silicon wafer on which EEV bond the real CCD. A flexi ribbon is glued directly on the aluminium block, and direct wire bonds made to the CCD and the underlying aluminium layer (for the back contact). The flexi consists of 50 microns of Kapton with 4 micron adhesiveless copper tracks 7 thou wide (except Vss - approx 25 thou), plated with 1 micron of nickel and 1/2 micron gold. The flexi is terminated with a 31 way miniature Cannon MDM connector soldered with indium solder. The MDM connector is normally at approx room temperature and the CCD package has been qualified between -150C and +150C. We also designed carriers boards for testing of the devices up until installation in the flight cameras - these include an anti-static captive clamp which is used to short out all the tracks to ground when not in use. regards Tony Abbey E-mail: afa@star.le.ac.uk CCD Group, Dept. of Physics and Astronomy Phone: +44 116 252 3490 University of Leicester, University Road Fax: +44 116 252 3311 LEICESTER LE1 7RH, United Kingdom -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From tmca Wed Feb 25 11:18:13 1998 From: tmca (Tim Abbott) Date: Thu Jul 29 11:54:40 2004 Subject: Just when you think you've got it all worked out... Message-ID: <199802252018.KAA15925@kuanalu.cfht.hawaii.edu> Posted to CCD-world: -+-+-+- Dear Collagues, I am dissappointed to report that CCD-world is now experiencing some problems. While the new list management software has guaranteed the absence of junk email, it has taken to occasionally removing someone from the list without any obvious good reason and without informing me. Fortunately, when it does this, it does inform the person who gets unsubscribed (which is distinctly strange, since the providers of the software have claimed that the only circumstances under which a subscriber is automatically deleted is when that person can't be reached. Go figure.) Therefore, if you get an email saying you've been unsubscribed from CCD-world, and did nothing to request such a thing, then please let me know immediately, enclosing the full message body and headers as you received them. I have contacted the authors of the software and will do my best to get this thing dealt with a.s.a.p., but if nothing's improved in a week or so, I will switch back to the old mail-exploder. Personally, I think that most software is now non-deterministic. My apologies for the inconvenience, normal service will be resumed as soon as possible. Best regards, Tim Abbott Moderator, CCD-world -- Timothy M. C. Abbott, Ph.D. http://www.cfht.hawaii.edu/~tmca/ Resident Astronomer tmca@cfht.hawaii.edu Canada-France-Hawaii Telescope Tel: +1 808 885 7944 Box 1597, Kamuela, HI 96743 Fax: +1 808 885 7288 -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From mckenna Wed Feb 25 10:00:34 1998 From: mckenna (DAN MCKENNA) Date: Thu Jul 29 11:54:40 2004 Subject: out gassing data Message-ID: Posted to CCD-world: -+-+-+- Hello CCD world, I would like to suggest a site that might be of interest to anyone concerned with vacuum issues. At http://misspiggy.gsfc.nasa.gov/og/ you will find a online source of out gassing data for all sorts of materials and components. Dan Mckenna mckenna@cfht.hawaii.edu -+-+-+- For information about CCD-world, send email to owner-CCD-world@cfht.hawaii.edu. From dryfood at anet.ne.jp Thu Feb 26 04:59:55 1998 From: dryfood at anet.ne.jp (Dryfood) Date: Thu Jul 29 11:54:40 2004 Subject: Mosaic CCD Electronics In-Reply-To: