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ENR CTIO Blanco 4-m 2017-07-25

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Date: 
Tuesday, July 25, 2017
Telescope: 
CTIO Blanco 4-m
Submitter: 
Alistair Walker
Submitter Email: 
Observer Support: 
Manuel Hernandez
Night Assistant: 
Claudio Aguilera
Also Present: 
Javier Rojas, Arjun Dey (Tucson)
Problems: 

We had three filter track fails, two near the start of the night, one almost at dawn.  Always when putting in the r filter,   We "solved" these in three diffferent ways

(i) a reset_filter in the ICS  plus configuring SISPI, so quick

(ii) the above did not work, and we recycled FCM power + restart SISPI

(iii) reset_filter was not working, and configuring SISPI "stuck" and SISPI bacame unresponsive and needed to be reatarted.  Then reset_filter worked, block filter in, started queue but r filter would not go in.  reset_filter again, block in and out, this time pout in the z filter which is opposite r in the slide, then took it out, then put in r, this worked, off we go again.

Klaus is going to look at the code, there is some strangeness is when reset_filter works and when it says "cannot be used".  Moving the filters all out should be always allowable assuming the hardware allows it.   In (iii) because of the very late (early!) hour we did not want to cycle the FCM power, and eventually succeeded.    SISPI getting stuck and needing restarted may not have been related to the filter problem, it should not do this.

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Partially cloudy
Wind: 
Medium
Seeing Value: 
1.40
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
7
2nd Quarter
Clouds: 
Cirrus
Wind: 
Medium
Seeing Value: 
1.30
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
6
3rd Quarter
Clouds: 
Cirrus
Wind: 
Medium
Seeing Value: 
1.20
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
2
4th Quarter
Clouds: 
Cirrus
Wind: 
Medium
Seeing Value: 
1.30
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
2
Program: 
Proposal: 
2014B-0404
Target of Oportunity: 
No
Time Observed: 
10.75
Time Engineering: 
0.0
Time lost technical: 
0.75
Time lost weather: 
0.5
Time lost other: 
0.0
Description: 
DECam Legacy Survey
Primary Investigator: 
David Schlegel
Institution: 
Lawrence Berkeley National Laboratory
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
12
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2017-07-25 10.75 0.0 0.75 0.5 0.0 12