Reports until 18:39, Tuesday 21 March 2017
H1 CDS (DetChar, ISC, SUS)
nutsinee.kijbunchoo@LIGO.ORG - posted 18:39, Tuesday 21 March 2017 - last comment - 20:53, Tuesday 21 March 2017(34989)
Violin modes are not being damped

Violin modes seem very high on DARM spectrum so I had a quick look at the damping screens. It appears that many of the filter banks (especially ETMs) have 0 input and 0 output. I also checked with the fast channels and dtt. The input seems nonzero on dtt but the output has nothing. As the result, some of the violin modes are not being damped right now. Hope it stays through the night until somebody comes in and fix this tomorrow.

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david.barker@LIGO.ORG - 20:53, Tuesday 21 March 2017 (34992)

This is an issue with the intermediate foton, referenced in today's alog

Link

Some very small gains (1e-32) were being replace with zero. This only affected filter files modified between last Tuesday (3/14) and this afternoon. I ran the following filter files through "foton -c" to correct the gains: H1SUS[I,E]TM[X,Y] and H1OMCPI. The files H1SUSMC2 and H1OAF were ran through the new foton this morning, H1SUSETMYPI was modified this afternoon with the new code.