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 picth pico pictues (R.Takahashi), or taking picture for picth 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 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 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.

??? Recovery(202404??)