IMC recovery(20240322)

• Suspensions(R.Takahashi)
  • Mechanical Motion
    • Smooth pico motion and its default position

      • MCi/o: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28907 -> A.I. upload pitch pico pictures (R.Takahashi), or taking picture for pitch pico. -> https://klog.icrr.u-tokyo.ac.jp/osl/?r=28941

      • MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28909 -> A.I. upload pitch, yaw pico pictures (R.Takahashi), or taking picture for pitch, yaw pico. -> https://klog.icrr.u-tokyo.ac.jp/osl/?r=28941

    • Gaps between magnets and coils -> MCo upper is the minimum, but this is the best effort.

    • Gaps between EQ stoppers and mirrors -> confirmed less than 1mm.

      • MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28915

      • MCi/o: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28913

  • Electrical wirings

    • Coil resistances and inductances -> A.I. Inductances should refer the past data if the coil did not change, or it will be measured again (Wasimi, 3/24(Monday morning)

      • MCo: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28668 -> A.I. MCo H4 looks high, it could be disconnection. It should be measured again (Wasimi, 3/24(Monday morning).

      • MCi/e: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28696 -> One of the MCi resistances is low, but low may have no problem. If it is high, it may have some disconnection.

    • Isolation of Wiring from coils to flanges(pico and mag-coil) -> MCi could not be accessed.

      • MCo: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28911 -> improved

      • MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28910 -> improved

      • POM: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28914 -> This does not matter for the suspension.

    • Fixing on tables is tight and reliable?
  • Smooth Mag-coil motion and balance and TFs
    • balance can be adjusted after closing?

    • MCi: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28938

    • MCo: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28939

    • MCe: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28940 -> A.I. Peak of pitch-shifted to higher frequency from the result of Feb.2. Needs remote centering for the Oplev first (Ushiba).

• Mirror conditions(Y.Aso)
  • Clean around the center?
    • MCe has a spot near the center. But its influence is expected to be small.

    • Inspection: https://klog.icrr.u-tokyo.ac.jp/osl/?r=28856

• Alignment(T.Akutsu, T.Ushiba, T.Yokozawa)
  • TEM00 flashing

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28912

  • The IMC trans beam is the same as before?

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28779

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28839

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28937

  • Beam positions on each mirror
    • They should be the same because the IMC trans was recovered in MCio?
    • How about on MCe? MCE tra QPD can be the reference.
  • QPD path and centering
  • Gaps between magnets and coils again
  • IP1/2 dynamic range check for the IMC injection?
  • Beam paths for IMC REFL.
• Beam dump(T.Akutsu)
  • Beam shield reinstallation

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28927

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28926

  • Beam dumps were additionally added?

    • In basic, No. Relocation was done. https://klog.icrr.u-tokyo.ac.jp/osl/?r=28931 -> Inside of beam duct between PSL and iMC looks shining.

• Vacuum, etc (N.Kimura, T.Uchiyama, S.Miyoki)
  • Cleaning

    • No dust inside, especially on the bottom? -> A.I. before closing.

  • Leak point was fastened tightly? -> A.I. when closing.

    • It will be done when the bellows are attached by Mirapro.

  • MCE trans flange rotation (the past activity is in https://klog.icrr.u-tokyo.ac.jp/osl/?r=28326) -> it will be done on Mon.

  • Lift-up tool check for bellows installation. (past accident https://klog.icrr.u-tokyo.ac.jp/osl/?r=28344)

  • Flange surface check to avoid leaking especially on GV_mcf

  • FFU stop for the MCE/MCREFL optical table and reconstruction of the window shield (MCE, MCF?). -> measurement of length of legs.

one of templates for IMC closing by Akutsu-kun in 2021.

Summary

• TF of MCe had a shift of peak frequency on the pitch. Ushiba-kun will measure it again with the well-centered oplev. It will be reported at the recovery meeting or later.
• All others should be OK for closing IMC chambers.
  • The resistance of the Coil of MCo H4 looked high. Washimi-kun will measure it again on Monday, but it won't stop closing anyway.
  • Washimi-kun will measure inductances again on Monday.
  • Check no dust inside, especially on the bottom before closing.
  • Check the leak points are fastened tightly when closing.

X-Pcal Recovery(20240402)

• Dan's presentation files

  • Path2 drift is concerns. However, we expect we can compensate for the drift by using pico-mirrors.

  • 5% power loss is concerned. It should be checked on 3~4 April. --> klog#29065

  • Pcal-X noise in the Cal line is OK? --> klog#29075

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
    • ttps://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)
• 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.
  • 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 TMS around the Cryostat.

*** Recovery(202404??)

*** Recovery(202404??)