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Reports until 11:17, Wednesday 11 September 2024
H1 ISC (SEI)
jim.warner@LIGO.ORG - posted 11:17, Wednesday 11 September 2024 (80042)
Another attempt at redistributing IMC gains, changes to IMC_LOCK & ISC_LOCK

There was an earthquake rumbling through the site from Papua New Guinea during commissioning this morning, so Sheila suggested we could try the IMC gain redistribution again, as we got several notifications of IMC splitmon saturations. To do this, we commented out the IMC power adjust decorator in the IMC_LOCK guardian, unfortunately  in the wrong state, so we again got bit by IMC_LOCK readjusting IMC fast gain while we were trying to change IMC fast gain and IN1 and IN2 gains. After losing lock and catching the error, the decorator was commented out in the ISS_ON state for IMC_LOCK, and the gain redistribution was added to ISC_LOCK's LASER_NOISE_SUPPRESSION state. Still waiting for the ground to calm down enough for the arms to stay locked, but we will try locking with the gain redistribution in this time.

 

 

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