betsy.weaver@LIGO.ORG - posted 14:22, Tuesday 03 October 2017 - last comment - 14:51, Tuesday 03 October 2017(38875)
SRM M2 and M3 AOSEM dark offsets measured
WHile the lower stage AOSEMs were pulled back over the last few days on SRM, I did a quick look at the dark offsets. Of course, the "pretty" OSEM offset script wouldn't work due to many years of CDS software tool upgrades since it's last uese (thanks Jim for tyring), so I just ran them by hand, and plugged them into the associated MEDM screens:
M2
| NEW OLV | OFFSET WAS | OFFSET NOW | GAIN WAS | GAIN NOW | |
| UL | 24350 | -13573 | -12175 | 1.105 | 1.232 |
| LL | 23240 | -13887 | -11620 | 1.08 | 1.291 |
| UR | 24350 | -13423 | -12175 | 1.118 | 1.232 |
| LR | 21780 | -12388 | -10890 | 1.211 | 1.377 |
| M3 | |||||
| UL | 22240 | -13741 | -11120 | 1.092 | 1.349 |
| LL | 23100 | -12966 | -11550 | 1.157 | 1.3 |
| UR | 23160 | -13527 | -11580 | 1.109 | 1.295 |
| LR | 20850 | -12420 | -10425 | 1.208 | 1.439 |
The OSEM strengths look to be decaying a bit.
Also, I set the pitch and yaw alignment sliders both to 0 since it is getting a fresh start. (Bias sliders were P=-666.3, Y = 927.4)
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