IYC Recovery(20240407)

• Suspension health check (Takahashi, Ushiba)

  • A01: Cable check -> accept

    • Re-cabling of BF damper

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28993

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29177

  • A02 Porality Check -> accept

    • Magnet gluing

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28831

    • According to Ushiba-kun's picture, they show that all the poraries are correct -> accept

  • A03 Rubbing Check
    • judge by the transfer functions
  • A04: Range and Calibration
  • A05: Watchdog Setting: Skip

  • A06: Height Measurement -> accept

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29064

  • A08: Calibration:skip

  • A09: Spectrum(spectra of IM/MN photosensors.) -> accept

    • ITMY IM/MN photosensors: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29140

    • ITMY tower sensor: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29141

      • Moving peaks exist, but amplitudes are not so high and frequency is far from controls. -> accept

      • 2nd and 3rd graph shows it can be removed when evacuated. -> accept, we should check it after the pump down.

  • A10: Transfer Function -> accept

    • Transsfer function : https://klog.icrr.u-tokyo.ac.jp/osl/?r=29138

      • F0 is close to the edge, so the gain is high. -> accept

      • F1 is within the range enough, we have no explanation for why the gain is so high. The reason for the dip of 8Hz depends on coupling, the earthquake might change the coupling. 1.6Hz peak showed in the new data, but we do not know why. However, no control is applied, so -> accept

    • EQ stop: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29087 -> accept

• Oplev Check (Yokozawa, Akutsu) -> accept

  • path check: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29098

• Green flash at REFL and Trans PD : https://klog.icrr.u-tokyo.ac.jp/osl/?r=29135

  • Flash was seen -> accept

• Windows Cleaning -> accept

  • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29128

• Tcam (Yokozawa and ChenDan, and Yamamoto)
• Baffle PDs (Yokozawa and his selected persons):
• NAB, WAB (Akutsu)

  • NAB: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28998 -> accept

  • WAB: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28984 -> accept

• There were some discussions written in each item, but all items were accepted.

• Vacuum system (Kimura-san / Uchiyama-kun and their selected persons)
  • Nasty air parts were replaced.
  • Vacuum alert recovery after pumping down.
  • GV interlock will be tried after pumping down.
  • N2 purge is necessary for IYV.
• Cryo-system (Kimura-san and his selected persons)
  • All temp signals are obtained?
  • Cryocon alert to slack after cooling.
  • No interlock for TMP around the Cryostat.