KAGRA/Recovery20
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.
- Smooth pico motion and its default position
- 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?
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).
- Mechanical Motion
- 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
- Clean around the center?
- Alignment(T.Akutsu, T.Ushiba, T.Yokozawa)
- TEM00 flashing
- The IMC trans beam is the same as before?
- 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
- 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.
- Cleaning
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.