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Reports until 13:07, Tuesday 08 July 2025
H1 SUS
oli.patane@LIGO.ORG - posted 13:07, Tuesday 08 July 2025 (85615)
SR3 Y damping estimator test

Last week Edgard and Ivey got new fits for the H1:SUS-SR3_M1_YAW_EST_MODL_SUSP_Y_2GAP and H1:SUS-SR3_M1_YAW_EST_MODL_DRV_Y_2GAP filter banks (85446). Now that we had those, it was time for us to try out the estimator damping again, putting into use all the measurements we did.

To take these regular damping vs estimator damping measurements for SR3 Y:

- I updated those filters in the filter banks listed above

- I exchanged the nominal OSEMINF gains with the gains from 84367

- I turned on the gain in FM7 of the DAMP filter bank that I had found a few weeks ago to counter the new OSEMINF gains (85288)

- Changed the Y damping gain to -0.1

- Additionally, last week we swapped out the SR3 satamp 85463, giving us better noise performance 85485

Measurement times
SR3 Y damp -0.1
2025-07-08 14:54:00 - 15:03:00 UTC

SR3 Y damp -0.1, OSEM damp -0.4
2025-07-08 15:03:15 - 15:48:00 UTC

SR3 Y damp -0.1, Estimator damp -0.4
2025-07-08 15:48:40 - 16:33:00 UTC

The transition between the OSEM damping and estimator damping went well and the estimator did a great job at lowering the noise (ndscope)!

 

The OSEMINF gain, DAMP Y gain, and DAMP filters have been set back to their nominal settings

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