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AOS (Optical Levers)
takaaki.yokozawa - 12:13 Thursday 23 February 2023 (24127) Print this report
Check the spectrum of oplevs for the works this week
I checked the spectrum of oplevs at corner station (MCI - SR2)

Blue : 2023/02/20(Mon) 03:00:00 (JST) Before the work this week (Mainly turning off the TMP and related pumps)
Red : 2023/02/23(Thu) 03:00:00 (JST) After the work this week
I selected early morning time because the suspension state may not change and no worker.

MCo : some different detected, but I don't know why changed in Yaw
IMMT1,2 : Decreased below 1 Hz.
PRM : Decreased below 2 Hz, but some peak appear around 3 Hz.
PR2 : Decreased much as Ushiba-san mentioned.
PR3 : Decreasing
BS : Decreasing much as Ushiba-san mentioned.
SR2, SR3 : Decreasing

The remaining peak around 17 Hz of SR2 and SR3 oplevs may come from the structure frame of clean booth. If we stop the FFUs more, their peaks would be smaller.

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takaaki.yokozawa - 10:47 Tuesday 28 February 2023 (24193) Print this report
I checked the oplev spectrum after stopping the FFUs.

IMC : reducing below 3 Hz
IMMT : reducing below 1 Hz
PRM : peaks became smaller
PR2 : reducing below 10 Hz
PR3 : reducing below 0.5 Hz
BS : RMS became smaller
SR3 : reducing below 3 Hz
SR2 : Increasing in some reason?? 17 Hz peak became smaller.

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