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Reports until 11:51, Thursday 17 July 2025
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elenna.capote@LIGO.ORG - posted 11:51, Thursday 17 July 2025 (85822)
Adjusted PRCL FF gain

Based on a recent bruco, it appeared that PRCL had relatively high coherence, especially near 100 Hz. I ran an injection today during commissioning to check the coupling. I adjusted the overall PRCL feedforward gain and found a lower coupling when the gain was reduced from 1.3 to 1. As soon as the gain reduced beyond 1, the coupling around 20 Hz started to get worse. I chose to use a new gain of 1, and updated the guardian and SDF. These changes are loaded. I also took a longer measurement of PRCL, on the off chance we want to do another iterative feedforward shaping in the future.

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