Reports until 13:54, Friday 22 July 2022
H1 ISC
evan.hall@LIGO.ORG - posted 13:54, Friday 22 July 2022 - last comment - 13:55, Friday 22 July 2022(64109)
AS_C whitening restored

Elenna, Evan

AS_C whitening had been turned off a few months ago for violin mode damping and it is now re-engaged (see attachment). The optical signal is at least 20 dB above the ADC noise limit (about 0.01 ct/rtHz) at all frequencies. The input filter modules contain calibration into milliwatts, but the resulting shot noise level does not quite hang together (observed noise seems a factor of a few higher than the expectation from shot noise).

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elenna.capote@LIGO.ORG - 13:55, Friday 22 July 2022 (64111)

Here are AS_C and SRC2 coherences comparing before (all reference trends) and after (all live trends) we turned the AS_C whitening back on.

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