matthewrichard.todd@LIGO.ORG - posted 17:42, Wednesday 04 June 2025 - last comment - 11:09, Thursday 05 June 2025(84809)
IMC refl-trans-wfs comparisons before and after vent
M. Todd, C. Cahillane, G. Mansell
We're curious if any of the IMC WFS channels (DC and RF) are seeing some of the peaks we witness in DARM. Most of the sensors seem dominated by phase noise due to being in air; IMC-TRANS seems the best witness. Not sure if there is anything meaningfull from these, indicating coherence with the DARM peaks.
List of Figures: references are from March 12th, 2025 -- lives are from June 4th, 2025
1. IMC REFL and TRANS PSD estimate comparison before (March 12, 2025) and after vent (June 4, 2025)
2. IMC WFS A/B DC/RF-I PITCH
3. IMC WFS A/B DC/RF-I YAW
The template to measure these again is found at /ligo/home/matthewrichard.todd/Templates/imc/imc_wfs_comparison.xml
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It seems like the summary of this is "input beam jitter was never good, but is worse now than in March 2025", especially at 500 Hz in IMC_REFL and IMC_WFS_DC.