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Reports until 09:18, Monday 23 September 2024
H1 ISC
thomas.shaffer@LIGO.ORG - posted 09:18, Monday 23 September 2024 - last comment - 12:26, Monday 23 September 2024(80250)
A2L DHARD reduced with scipt, CHARD worse

Sheila and I are still trying to determine if the a2l script can be helpful, or made helpful, and understand our coupling from these changes to DHARD and CHARD. We ran it today with both C&D HARD showing higher coherences with our current lock (attachment from Ryan C's alog80244). After running the script the largest change was to ITMY Y gain (-0.28 diff). This helped out DHARD from 15-35Hz, but made CHARD worse in 10-21Hz. We were then going to try and tune common by hand to see if we could make any difference, but we lost lock.

We decided to update the gains with the script results since this did help out our DHARD. Perhaps an acceptable trade off for now. Values for the Y gains have been updated in lscparams and SDF, but P was close enough that I left them alone.

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thomas.shaffer@LIGO.ORG - 12:26, Monday 23 September 2024 (80251)

We had the chance to try one ITM common step by hand before running out of time, but it seemed to help out CHARD in the lower frequencies that we care about and and not affect DHARD.

Final gains +0.1   ITMY=-2.43   ITMX=3.05

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