craig.cahillane@LIGO.ORG - posted 18:15, Friday 30 May 2025 - last comment - 18:56, Friday 30 May 2025(84679)
CARM_TO_REFL glitches causing locklosses occasionally
We often have massive glitches in the PRG when we transition from CARM_TO_REFL to RESONANCE (states 409 - 410 in ISC_LOCK_STATE_N).
PNG 1 shows this.
This evening this glitch caused at least one lockloss.
I believe the problem may be from lines 2700 to 2705 in ISC_LOCK.py.
# Transition between TRXY and REFLAIR
ISC_library.intrix['REFLBIAS', 'TR_REFL9'] = 2.0 #put back from 3.0 to 2.0 on 09/10/2018
ISC_library.intrix['REFLBIAS', 'TR_CARM'] = 0.0
ezca['LSC-PD_DOF_MTRX_TRAMP'] = 0.2
time.sleep(0.1)
ISC_library.intrix.load()
We switch between these two intrix values (from TR_CARM to TR_REFL9) in only 0.2 seconds.
I'm going to up this to a full 2 seconds, and see if these glitches go away.
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Next time through CARM_TO_REFL, we did not have a glitch.
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