Reports until 10:17, Wednesday 20 November 2024
H1 AOS
sheila.dwyer@LIGO.ORG - posted 10:17, Wednesday 20 November 2024 (81383)
SQZ TTFSS error check changes, PSL FSS off

Vicky, Sheila

Last night the squeezer FSS was off during our test of running the PMC with the FSS unlocked and unplugged.  This is because of some error checking that was written when the squeezer (and ALS) pick offs were from the reference cavity transmission, so there were too check on the reference cavity transmitted power, and an error check on the reference cavity transmission PD.   Since the reference cavity was unlocked the automation had an error overnight and didn't lock the SQZ TTFSS.

This morning we changed the H1:PSL-REFCAV_TRANS_DC_LOW from 0.3 to -0.1, and changed H1:SQZ-FIBR_LOCK_REFCAV_TRANSLIM to -0.1, so that the squeezer FSS will stay locked.

The PSL FSS has been powered down with the squeezer FSS on since 17:45 UTC Nov 20th.