Reports until 14:11, Friday 24 October 2025
H1 ISC
elenna.capote@LIGO.ORG - posted 14:11, Friday 24 October 2025 (87728)
POP A RF45 whitening set wrong

We (Sheila, Jennie, Ryan, Oli) have found that the POP A RF45 antiwhitening gain was set incorrectly. We tracked this problem down to the SDF being saved incorrectly Monday night along with with various dark offsets (87598). The antiwhitening gain should be -15 dB but was set to -21 dB. Additionally, the new dark offsets were doubled. We think this problem explains why the MICH gain needed to be doubled this week (87645).

I reset the safe SDF to have the correct LSC POP antiwhitening filters, and reverted the dark offsets as well.

Extra kudos to Jennie for scrolling through Dave's SDF difference file (400 settings!) to find this mismatch, 87718.

Sheila edited the guardian to remove the MICH gain doubling.

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