TITLE: 02/12 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY:
IFO is in NLN and OBSERVING as of 05:58 UTC
Pretty quiet shift with one EQ caused Lockloss (alog bla bla)
We also dropped out of OBSERVING briefly since SQZ unlocked. The SQZ_OPO_LR was not reaching its count threshold of 80. Following this wiki page, I first attempted to change the SHG temperature in order to increase the SHG power, which was indeed reduced compared to Lock Acquisition time. This did not work, so I ended up reverting my -0.015C change and just set the threshold from 80 to 74 in SQZ params, which did end up working. After this, I retuned the opo temp, which prompted SQZ to automatically re-lock. After SQZ ANGLE guardian optimized the angle, we were able to get back into Lock. There were no SDFs to accept before going back to OBSERVING. Total troubleshooting/outage time was 40 mins, from 02:21 UTC to 03:01 UTC.
LOG:
None
SHG power drop was probably due to LVEA temp swings, I touched the wave plates in the SHG path to reduce rejected SHG light (in SQZT0 and HAM7). Then tried setting opo_grTrans_setpoint_uW back to 80uW but controlmon was at 1.5 (too low). Reverted back to 75uW so H1:SQZ-OPO_ISS_CONTROLMON is at 2.4 (still not ideal). Didn't recheck OPO temp.