EXC Recovery(20240404)

• Suspension health check (Takahashi, Ushiba)
  • A01: Cable check

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28840 -> please update.

    • Other data are expected to be normal.
  • A02 Porality Check
    • impossible to change. so no problem.
    • Cable disconnection happened, but they were recovered.
    • Replaced magnets was checked by TF etc.

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29100

  • A03 Rubbing Check

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29100

  • A04: Range and Calibration
    • The stepper motor range was checked.
    • Calibration will be the same.
  • A05: Watchdog Setting: Skip
  • A06: Height Measurement

    • Done: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28780

    • Setpoint change after the height setting. So the height could be changed.
    • If we believe LVDT values, we believe the height would not change in the orders of mm.

  • A08: Calibration:skip

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

    • OK https://klog.icrr.u-tokyo.ac.jp/osl/?r=29102

    • OK https://klog.icrr.u-tokyo.ac.jp/osl/?r=29107

  • A10: Transfer Function

    • OK as modeling: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29100, https://klog.icrr.u-tokyo.ac.jp/osl/?r=29106

    • Phase delay in R -> R, but no such delay in other DoFs. The data in the air tends to have such phase delay in the DoFs. No influence on IFO/Sensitivity.

    • BF resonance has changed from 0.3 to 0.6Hz. Assuming this changes, the TF can be explained. https://klog.icrr.u-tokyo.ac.jp/osl/?r=28990, https://klog.icrr.u-tokyo.ac.jp/osl/?r=29106

    • We need change the filter shape according to these changes. UGF was set around 0.01Hz. So a fine tune is necessary.
• Oplev Check (Yokozawa, Akutsu)

  • MN: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28905

  • TM: Easy to find. SI should be cared. Will be don in Monday.
  • PF: Easy to find. SI should be cared. Will be don in Monday.
• Green flash at REFL and Trans PD
  • REFL: OK
  • TMSX: No beam on PD. will be done on Monday. No CCD and PD at present.
  • Flash can be seen in Tcam.
• X-Pcal homeworks

  • The spec loss at PBS can be comparable with the mysterious loss: Loss of power of ~ 4 %: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29081

  • Cleaning inside was done: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29091

• Windows Cleaning

  • Done: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28976,

  • Blanck ports:
  • check whether bolts have holes or not.

• Tcam (Yokozawa and ChenDan, and Yamamoto)

  • Consistent with CAL data: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28830

  • Grenn image can be seen.
  • No problems from the Pcal side.
• TMSX optical system (Akutsu and his selected persons)
• TMSX vibration isolation system (Akutsu and his selected persons)
• Baffle PDs (Yokozawa and his selected persons):
  • Check on Monday.
  • A power supplier is ready?
• NAB, WAB (Akutsu)

  • NAB: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28757

  • WAB: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28758, https://klog.icrr.u-tokyo.ac.jp/osl/?r=28627

• Vacuum system (Kimura-san / Uchiyama-kun and their selected persons)
  • tie rod adjustment between EXC and TMSX to avoid stress when the only EXC side is pumped down.
  • Replaced flange
  • Nasty air parts were replaced.

  https://klog.icrr.u-tokyo.ac.jp/osl/?r=28872

  • Vacuum alert recovery after pumping down.
  • GV interlock will be tried after pumping down.
  • The broken cc-10 was replaced.
  • N2 purge is necessary for EXV.
• Cryo-system (Kimura-san and his selected persons)
  • All temp signals are obtained?
  • Connector change is required for the heat link suspensions.
  • Cryocon alert to slack after cooling.
  • No interlock for TMP around the Cryostat.