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Reports until 18:02, Monday 20 October 2025
H1 SUS (SQZ)
oli.patane@LIGO.ORG - posted 18:02, Monday 20 October 2025 (87591)
(More) SQZ Filter Cavity ASC Results from Satellite Amplifier Swap

This is basically a continuation of 86624. Sheila gave Jeff a few more channels to look at regarding the SQZ ASC comparison before and after the satamp swap. The channels I looked at were H1:ASC-AS_{A,B}_RF42_{PIT,YAW}_OUT_DQ.

I looked around and found the best times for before and after the swap, but it is possible there are better times, and the secondary microseism was changing a lot over that period of time, so the lower frequencies are all over the place.

The results I got honestly seem a bit too good of an improvement (comparing them to the amount of improvement we saw in 86624).

Comparison Times
Before swap: 
- 2025-08-02 01:44 UTC; 0.01 BW, 46 averages (PINK) OR
- 2025-08-02 09:23 UTC; 0.01 BW, 46 averages (RED)
After swap: 
- 2025-08-07 07:21 UTC; 0.01 BW, 46 averages (GREEN)
- 2025-08-09 12:52 UTC; 0.01 BW, 46 averages (BLUE)

Comparison Results
Pitch
ASC-AS_A_RF42_PIT_OUT_DQ
ASC-AS_B_RF42_PIT_OUT_DQ
Yaw
ASC-AS_A_RF42_YAW_OUT_DQ
ASC-AS_B_RF42_YAW_OUT_DQ

There does seem to be a decent decrease in noise between 0.8 and 4 Hz for all four ASC dofs, but again, it could just be that the before times aren't as good as they could be. The increase in noise below 0.5 Hz (especially in the green traces) is due to the increase in secondary microseism that I mentioned  in 86207.

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