corey.gray@LIGO.ORG - posted 07:47, Monday 17 February 2025 - last comment - 07:58, Monday 17 February 2025(82849)
H1 Wake Up Call Due to SQZ OPO LR node (SHG TEC Set Temperature needed to be lowered)
1452utc (652ampdt): Wake up call due to No Squeezing.
SQZ Symptoms & Solution:
- SQZ Manager not able to get to FDS.
- Taken to DOWN
- SQZ_OPO_LR node not able to get through ENGAGE PUMP ISS
- USERMSG 0: No pump ISS means injecting bad squeezing. Going DOWN.
- Then goes down and repeats.
- Following the SQZ wiki instructions, focused on OPO_LR.
- OPO_TRANS_LF_OUT_DQ is just under 40counts and is LOWER than "opo_grTrans_setpoint_uW" (which is currently 60).
- adjusted SHG TEC SETTEMP (started at 35.12 counts with a SHG GR_DC POWERMON OF 92).
- Eventually took Set Temp down to 33.70 counts for a GR_DC_POWERMON OF 124 (see attached).
- Took OPO_LR to LOCKED CLF_DUAL, then SQZ MANAGER to FDS, accepted the new SHG temperature set point (see attached), and...
- 1538utc Back to OBSERVING
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It's been about 20min since we went back to Squeezing, but it appears the adjusting of the SHG TEC Setpoint Temperature made squeezing possible, but now the range did not improve at all. Left a note for the Day Shift in mattermost.
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