varun.srivastava@LIGO.ORG - posted 12:52, Saturday 26 October 2019 - last comment - 15:57, Saturday 26 October 2019(52703)
Excess Instrument Noise from 10Hz to 600Hz
Sheila Varun After acquiring full lock in nominal noise we observe excess noise in frequencies band from 10 Hz to 600 Hz. Reading out the accelerometer at the different chambers during the full lock from this morning (red) and comparing it against Sep 21 2019 19:03:38 UTC (dashed blue), we observe almost a factor of 10 more noise as compared to late O3a. Please refer to the plots attached.
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Robert came in and doesn't think that extra motion on the chamber walls can explain the excess noise we are seeing in DARM, so we are looking for some other explanations.