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H1 ISC

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stefan.ballmer@LIGO.ORG - posted 10:49, Friday 08 November 2019 - last comment - 18:45, Friday 08 November 2019(53096)

H1:ISC-RF_C_SQZAOM200M_OUTPUTMON correlated with range drops - even on sub-second time scales

H1:ISC-RF_C_SQZAOM200M_OUTPUTMON correlates with range drops even on sub-second time scales.

Attached are plots for GPS

1256913467 (same drop as in alog 52979)
1257226318 (today)
1257229296 (today)

Note that the sharp drop in 1256913467 corresponds down to the second with the range drop in alog 52979.

Images attached to this report

Comments related to this report

daniel.sigg@LIGO.ORG - 10:57, Friday 08 November 2019 (53097)

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H1:ISC-RF_C_SQZAOM200M_OUTPUTMON used to monitor the RF power level of the RF amplifier that drives the first AOM in the CLF path. This AOM driver has been replaced by a new AM modulated AOM driver. H1:ISC-RF_C_SQZAOM200M_OUTPUTMON is still connected to old RF amp that is now powered off. What this channel senses is very unclear.

joshua.smith@LIGO.ORG - 18:45, Friday 08 November 2019 (53110)

Link

This channel was also the most correlated result in the re-run lasso in my last comment here https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=53091 and that entry lists other channels highly correlated with this channel.