Reports until 19:55, Monday 03 June 2024
H1 SEI
jim.warner@LIGO.ORG - posted 19:55, Monday 03 June 2024 - last comment - 20:05, Wednesday 05 June 2024(78226)
Some extra St2 isolation loops and St1-2 sensor correction running on BSCs temporarily

Wind was brutal today, so I was messing with the controls on the BSCs to try to help. Mostly just running RX/RY sensor correction from St1 to St2 on the BSCs. Sensor correction is focused on improving the ~.4hz motion and doesn't really affect the motion outside that. I don't think this really helped, winds calmed down after I left at 5:30 and Ryan is almost all the way NLN now, so I will leave the extra sensor correction running for tonight. I'll accept SDFs for tonight, then turn it back of during maintenance tomorrow.

Wind and lock losses make a comparison challenging, but the blrms trends show the (log scale) improvement ETMY sees when it's turned on over .3-1hz. Top trace is the St2 RX GS13 blrms, middle trace is the gain for the sensor correction, sc is on when it's 1, off at 0. Bottom trace are the .3-1hz ground blrms. For the las 3-ish hours the St2 RX motion is lower with the sensor correction on even when the ground is moving more in this frequency band.

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jim.warner@LIGO.ORG - 20:05, Wednesday 05 June 2024 (78270)

These changes were reverted today, in case they were causing issues with locking. ASC was engaged at the time, I didn't see any effect turning this stuff off, so I think they were probably benign.