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Reports until 14:57, Tuesday 27 May 2025
H1 ISC
georgia.mansell@LIGO.ORG - posted 14:57, Tuesday 27 May 2025 (84595)
ALS-DIFF PLL offsets for FIND_IR changed order

Mr Todd, Georgia

We've been losing lock from DRMI a lot today and we noticed that the FIND_IR state was taking a few minutes between finding the x-arm IR and y-arm IR. We checked the ALS_DIFF guardian, and found in the stored PLL offsets (alsDiffParams.dat), the offset we were ending up (around 400) was second on the list, so we reordered the list so this is the first place the PLL goes. Now it is:

{"diffOffsets": [407.0, 3242.0, 388.0]}

Hopefully this saves valuable minutes going forward...

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