MODS2 Commissioning Night 3

Blue channel sequencer board is not working properly. Last night, from 1/4 to 1/3 of the images were bad and it seemed that the noise correlated with light level. Plan is to take a few highly illuminated images (wiggle.cal or imaging flats) to assess the noise problem, and then run the light leak test, as well as take sieveSnap images at varying elevations.

Snow on the mountain - no chance to open tonight.

Ran up both MODS1 and MODS2

mods1(b/r).20150101.*.fits and

mods2(b/r).20150101.*.fits

Copied doBias to doBias2 and edited doBias2 to use MODS2 (execMODS -> execMODS2)

modsWake

sieveSnaps at zenith:
  • MODS1: b/r 1
  • MODS2: b/r 1

doBias(2):
  • MODS1: b/r 2-11
  • MODS2: b/r 2-6 are 8K and 7-11 are 3K
    • b 7 is bad

01:45 execMODS2 imflats_mods2.cal (in ~/SciPrep/MODS/modsCalibs_Workspace --- a directory where I had copied and edited it for MODS2)
  • MODS2: b 12-14 at u' (8500 counts)
  • after 14, hung on "Exposure Done, cleaning up..."
    • 14 is in /newdata
    • gave "blue expdone" in command window of gui
    • OK now, but cntl-c script because the lamp level and exposure time are not giving enough counts. Since editing the copy in my modsCalibs_Workspace directory, I worked on the actual imflats.cal script that is in modseng. I will run that for MODS2.

01:56 execMODS2 imflats.cal (in ~modseng/modsScripts/modsCalib/)
  • mods2b: 16 saturated vflat=10, exptime=50 u'
  • simultaneously run the script for MODS1:
    • mods1b: 12-16 23k counts vflat=10, exptime=50 u'
    • mods1b: 17-21 27k counts vflat=4, exptime=12 g'
    • mods1r: 12-16 r' 22.5k counts
    • mods1r: 17-21 i' 20k counts
    • mods1r: 22-26 z' 18k counts
  • mods2b: 18 vflat=10, exptime=20sec u'
    • 18: 24000 counts in lower two quads, 600 counts in upper quad
    • 19: repeat same vflat/exptime in case 18 was recovering from previous hard saturation.
      • count level ~30k, but sequencer problem.
    • 20: same parameters as 18&19.
      • count level ~33k, but again sequencer problem.
  • mods2b: 21 g' vflat=4, exptime=4 => 14k counts (filter/vflat/exptime all incorrect in title) no sequencer problem
  • mods2b: 22 g' vflat=4, exptime=8 => 28k counts, again, no sequencer problem (is it triggered only for counts > 32k?)
  • mods2b: 23 g' vflat=4, exptime=10 => again, lower two quadrants have ~32k counts, upper two quads have 500-1000 counts only.
  • mods2r: run imflats.cal (copy of what is in ~modseng) for r', i' and z' to check count levels
    • 12-16 r' vflat=3/exptime=2 => 39.5k counts
    • 17-21 i' vflat=1.5/exptime = 7 => 25.5k-23.3k (really dropped over the course of 5)
    • 22-26 z' vflat=1.5/exptime=3 => 27k

The vflat lamp appears either brighter at all settings or to follow a different curve for MODS2 than for MODS1. In the red channel, for the same vflat/exptime, count levels are a factor 1.75/1.22/1.5 higher for MODS2 for r'/i'/z' and vflat = 3/1.5/1.5. For u' where MODS1 used vflat=10 and exptime=50 to get only 20k counts, MODS2 u' count levels reached hard saturation but blue channel comparisons could be complicated by the MODS2 blue sequencer/readout problems.

8K biases with MODS2 (b 24-28 and r 27-31)

03:00 starting leakTest on MODS1 and MODS2
  • edited leakTest in ~modseng/Commissioning to replace mask "PinholeSieve" with "PinholeSlit"
  • copied leakTest to /home/lbto/kuhn and changed "PinholeSieve" to "DarkMask"
  • dome dark:
    • mods2: b 29-33 and r 32-36
    • mods1: b 22-26 and r 27-31
  • lights on: waiting 5 minutes to allow them to warm up
    • mods2: b 34-38 and r 37-41
      • mods2r showing some light leaks on the right side, X~7415 and also lower level light at top and bottom for X~1606
    • mods1: b 27-31 and r 32-36
      • mods1r showing some light at X~7500 and for X~1336
      • mods1b showing some light at bottom right, for X>7500 and Y<2010 and near bottom center. mods2b does not show this.

04:27 put both MODS1 and MODS2 to sleep.

Happy New Year!

-- %USERSIG{OlgaKuhn - 2015-01-01}%

Comments

 
Topic revision: r1 - 01 Jan 2015, OlgaKuhn
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