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Reports until 16:31, Thursday 03 December 2015
H1 General (DetChar)
evan.goetz@LIGO.ORG - posted 16:31, Thursday 03 December 2015 - last comment - 21:18, Thursday 03 December 2015(23939)
Elevated H1 glitch rate and elevated microseism

Currently ~6m wave activity off the Pacific Northwest coast causing elevated microseism. Omicron glitch rate correspondingly rises, especially in the low frequency region. I attach an image showing microseism trend and Omicron glitchgram. Can we get clues to upconversion mechanisms from IFO data during this time?

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Comments related to this report
evan.goetz@LIGO.ORG - 18:12, Thursday 03 December 2015 (23940)

Evan G., Patrick T.

ISI Blend state is the same over this time period, nominal 45 mHz configuration (see attached). There was a brief time in the unlocked state where ETMX Y degree of freedom was switched but then switched back before relocking.

Wind is sub-10 mph.

Images attached to this comment
joshua.smith@LIGO.ORG - 21:18, Thursday 03 December 2015 (23944)DetChar, SUS
The summary pages show several optics, notably SRM and PRM, moving enough during this period to drive scattering fringes in the detection band. That's a likely cause for the low frequency glitches. Needs to be followed up to check the fringe prediction vs data for for some short specific times. https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20151203/detchar/scattering/
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