elenna.capote@LIGO.ORG - posted 12:09, Monday 21 July 2025 - last comment - 15:19, Thursday 28 August 2025(85893)
New MICH ASC lowpasses engaged
Instead of redesigned the MICH ASC loops, I just updated the lowpasses to be at 12 Hz instead of 15 Hz, which should reduce the gain by 15 dB between 10-20 Hz for both pitch and yaw. I tested them today with no issues, so I adjusted the MICH ASC engagement in ISC_DRMI guardian, and updated SDF (accidentally overwrote the screenshot with my screenshot of the filter).
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Based on the results from Sheila's noise budget, I adjusted this filter to 9 Hz, which has further reduced the MICH ASC coherence with DARM. New filters are in FM8, lownoise ASC engages these filters. SDFed and guardian code tested.
References are coherence from the last lock, live traces are after filter is engaged.
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