aLIGO LHO Logbook

H1 SUS (SUS)

corey.gray@LIGO.ORG - posted 08:32, Saturday 30 September 2023 - last comment - 09:20, Saturday 30 September 2023(73180)

Ringing Up Of OMC DCPDs over the last 8hrs

Attached is a look at the OMCs for this lock and the ring up starts about 8hrs ago.

Have sent a text to Rahul regarding violins.

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rahul.kumar@LIGO.ORG - 09:06, Saturday 30 September 2023 (73182)SUS

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ITMY mode05 and 06 has been rising for the last 12hrs while we are locked and Observing. I have switched off the gains for now and keep an eye on it. Will tweak the settings once it drops down a little.

Also IY mode07, hence have switched off the damping for this mode too.

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corey.gray@LIGO.ORG - 08:58, Saturday 30 September 2023 (73183)

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Here is a look at darm 10hrs ago (5:00utc) & 30min ago (15:30utc). Have been chatting with Rahul and he sees ITMy mode 5 & 6 have been ringing up 12hrs ago (H1 locked 15hrs ago), so he is turning off their damping and will monitor....I can already see the OMC ndscope ringing up stopping and turning around.

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rahul.kumar@LIGO.ORG - 09:20, Saturday 30 September 2023 (73184)SUS

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OK I think I found the reason why IY05/06 and modes nearby are rising. The gain sign for IY05/06 was flipped last night (see Tony's alog 73178) and that led to the mode rising over time. For now I will keep mode IY05,06,07,08 OFF and in some time will slowly set them to nominal settings and see how it goes.

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