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DetChar (General)
shoichi.oshino - 14:43 Tuesday 14 May 2024 (29496) Print this report
4.5 Hz peak of IMC
I compared the IMC cavity noise to the 3-10 Hz BLRMS of the seismometer at MCF.
During the daytime, when ground vibration is larger, the peak of cavity noise around 4.5 Hz is larger.
Checking the OpLev signal of the MC suspensions, there is a peak around 4.5 Hz, which could be due to the mirror or OpLev vibration.
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shoichi.oshino - 17:09 Wednesday 15 May 2024 (29514) Print this report
As Ushiba-san recommended to check IMC QPDs, I made several QPD median spectrograms.
These plots are shown for one day data on 5/13.
I used {IMMT1, MCE}_TRANS_QPDA{1,2}_DC_{PIT,YAW} channels.
The 4.5Hz peak is seen on all channels.
There also appear to be peaks at 9Hz and 13.5Hz.
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takaaki.yokozawa - 9:13 Thursday 16 May 2024 (29528) Print this report
From the results of the tapping test inside the MCF/MCE chamber (https://klog.icrr.u-tokyo.ac.jp/osl/?r=28943),
The resonant frequency of MCF vacuum optical table is suspection point
Page 12 in https://klog.icrr.u-tokyo.ac.jp/osl/uploads/28943_1711094276_tappintest_MCF_2024-03-22.pdf
takaaki.yokozawa - 10:00 Thursday 16 May 2024 (29529) Print this report
Spectrum for daytime(red) and night time(blue) for IMMT1 trans QPD P/Y
Also in MCi/e/o oplev signals,
Anyway, we need to reduce the noise of MCo oplev
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shoichi.oshino - 17:37 Thursday 16 May 2024 (29537) Print this report
I also made median spectrograms of WFS signals on 5/13.
Used channels are IMC-DOF{1,2,3,4,5}_{P,Y}_IN1.
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shinji.miyoki - 7:37 Friday 17 May 2024 (29542) Print this report

Could you please check the covering for MCo oplev again?

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