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The second winter storm came in last night and there is snow and wind. No chance of opening.

Based on the data taken 22 Dec (UT), shims were placed at chip 4 and chip 3.

Doug and Wayne inserted 100 micron shims at chip 4 and chip 3. With the rotator at -180 degrees, we ascertained visually that chip 4 was up. So, looking from the side of the cryostat towards the primary mirror, these shims were placed up and to the right.

I have noticed this afternoon and yesterday afternoon that the temp/vacuum data has dropped out - yesterday for the blue camera and today for the red camera. As expected, the camera will not initialize. The solution was to power cycle HK.

21:10 Starting a set of 25 biases. Dome lights off.

BLUE BIAS (last one)
 image npix mean midpt stddev
 /Repository/lbcb.20081224.042725.fits[LBCCHIP1]  10616832     739.4     736.8     93.79
 /Repository/lbcb.20081224.042725.fits[LBCCHIP2]  10616832     811.7     811.2     7.107
 /Repository/lbcb.20081224.042725.fits[LBCCHIP3]  10616832     756.8      756.     12.47
 /Repository/lbcb.20081224.042725.fits[LBCCHIP4]  10616832     735.5     734.7     8.371

RED BIAS (last one)
image npix mean midpt stddev
 /Repository/lbcr.20081224.042512.fits[LBCCHIP1]  10616832     307.3     306.9     10.41
 /Repository/lbcr.20081224.042512.fits[LBCCHIP2]  10616832      554.     554.3     13.66
 /Repository/lbcr.20081224.042512.fits[LBCCHIP3]  10616832     362.8     362.4     9.945
 /Repository/lbcr.20081224.042512.fits[LBCCHIP4]  10616832     338.5     339.1     9.999

bias statistics: stddev/mean in 25x25 box: RED; note that the red biases show some pattern noise -
      stddev/median
chip 1: 5.5/371
chip 2: 5.0/563
chip 3: 5.5/321
chip 4: 5.0/329

BLUE; stddev is similar to that on red,
       stddev/median
chip 1: 5.0/754
chip 2: 4.8/808
chip 3: 5.6/731
chip 4: 5.0/724

22:00 Two 1hr darks B 042916,052955 and R 042913, 052946

BLUE
   
 image npix mean midpt stddev (for chip 1, there is a vertical gradient from ~750 to ~775 counts, typical counts are closer to 750 and I don't know where the midpt value of 713 comes from).
 /Repository/lbcb.20081224.052955.fits[LBCCHIP1]  10616832     779.1     713.7     1170.
 /Repository/lbcb.20081224.052955.fits[LBCCHIP2]  10616832     827.6     826.3      72.7
 /Repository/lbcb.20081224.052955.fits[LBCCHIP3]  10616832     780.5     778.8     195.9
 /Repository/lbcb.20081224.052955.fits[LBCCHIP4]  10616832     745.6     744.4     54.14

RED
/Repository/lbcr.20081224.052946.fits[LBCCHIP1]  10616832     331.3     326.1     110.1
 /Repository/lbcr.20081224.052946.fits[LBCCHIP2]  10616832     567.7     563.2     130.2
 /Repository/lbcr.20081224.052946.fits[LBCCHIP3]  10616832     383.3     378.4     117.3
 /Repository/lbcr.20081224.052946.fits[LBCCHIP4]  10616832      348.     343.4     109.7

23:30 Two 15-min darks
 
 lbcb.20081224.064827.fits[LBCCHIP1]  10616832     756.5     737.8     677.7
 lbcb.20081224.064827.fits[LBCCHIP2]  10616832      821.     819.7     63.43
 lbcb.20081224.064827.fits[LBCCHIP3]  10616832     771.2     770.1     104.5
 lbcb.20081224.064827.fits[LBCCHIP4]  10616832     737.9     736.9     16.21
 lbcr.20081224.064819.fits[LBCCHIP1]  10616832     326.5     325.2     45.18
 lbcr.20081224.064819.fits[LBCCHIP2]  10616832     563.1     561.8     77.62
 lbcr.20081224.064819.fits[LBCCHIP3]  10616832     374.9     373.1     47.82
 lbcr.20081224.064819.fits[LBCCHIP4]  10616832     342.5     341.2     46.88

00:10 25 biases

00:30 Turning off LBC, Leaving HK on.

-- OlgaKuhn - 24 Dec 2008
Topic revision: r3 - 21 Jul 2009, NormCushing
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