Reports until 15:31, Monday 06 November 2023
H1 ISC
camilla.compton@LIGO.ORG - posted 15:31, Monday 06 November 2023 - last comment - 16:18, Monday 06 November 2023(74028)
Increasing ADS gains in TURN_CAMERA_SERVO_ON state of CAMERA_SERVO

Naoki, Camilla 

After noticing that it has been taking >20 minutes for the ADS servos to converge once we are at NLN 73842, Jenne suggested increasing ADS gains by a factor of 3 once we are close to NLN (after TRANSITION_TO_ETMX). 

After this afternoon's 22:52UTC lockloss,  Naoki edited lscparams and CAMERA_SERVO.py to increase the ADS gains from 20 to 60 in the TURN_CAMERA_SERVO_ON state of CAMERA_SERVO guardian. This state is only requested in ADS_TO_CAMERA state of ISC_LOCK, where it should be safe to increase gains. We'll plan to watch this first relock. 

Comments related to this report
camilla.compton@LIGO.ORG - 16:18, Monday 06 November 2023 (74031)

ADS converged in 2m15 after we got to NLN. Plot attached. The threshold is for PIT/YAW ADS channels to be < 0.0025 (y-cursors), this appeared to happen briefly at t2-cursor, triggering the swap to camera servos. 

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