• KAGRA
• Recovery2024
• IFIPRM

Suspension Condition of PRM, IMMT1/2. (Takahashi-san, Ushiba-kun)

IMMT1/2, PRM

• Mechanical Motion
  • Smooth pico motion and its default position
  • Gaps between magnets and coils

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

    • IMMT1/2

      • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29314

        • Yaw Pico is at near the edge. --> Acceptable

      • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29313

        • Though the EQ stop frame on the XY stage is unstable, the jump of the TM pitch is within the Oplev range. --> Acceptable

    • PRM

      • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28380

        • The balance of the TM was recovered by regluing of three magnets.
        • The wire cramp on the IM for the TM was tightened.
        • Height adjustment.

      • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28710

        • Position measurement of the traverser.

      • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29366

• Electrical wirings

  • Coil resistances and inductances ->

  • Isolation of Wiring from coils to flanges(pico and mag-coil) ->
  • Cable repair for the BF damper. The lead wires were glued to prevent direct touching of the wires to the coil bobbins.

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28712

  • Fixing the cable connector for SF LVDT

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=28586

• Smooth Mag-coil motion and balance and TFs
• Spectrum

  • IMMT2: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29320

  • IMMT1: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29319

  • PRM: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29348

  • PRM: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29349

• Mirror conditions(??)
  • Clean around the center?

Beam Path from IMC to PRM (Yokozawa-kun, and Akutsu-kun)

Activities:

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29261 (Finalization of IFI-IMM-PRM: Day 1 PM)

  • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29271 (Comment to Finalization of IFI-IMM-PRM: Day 1 PM)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29273 (Finalization of IFI-IMM-PRM: Day 2)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29282 (Finalization of IFI-IMM-PRM: Day 3 AM)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29283 (Finalization of IFI-IMM-PRM: Day 3 PM)

  • https://klog.icrr.u-tokyo.ac.jp/osl/?r=29285 (Comment to Finalization of IFI-IMM-PRM: Day 3 PM)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29299 (Finalization of IFI-IMM-PRM: Day 4)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29308 (Finalization of IFI-IMM-PRM: Day 5)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29334 (Finalization of IFI-IMM-PRM: Day 6)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29342 (Finalization of IFI-IMM-PRM: Day 7-1)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29343 (Finalization of IFI-IMM-PRM: Day 7-2)

IMC to STM1

• Beam clearance: OK

STM1/2

• Mirror mount stability with cables
• Beam positions on them
• Trans beam from STM2

IFI to IMMT1

• IFI injection: No clipping
• Beam position on IMMT1
• Trans beam of IMMT1
  • No change to ISS path?
  • ISS beam/CWP reflection beam extracting (??)
  • the beam paths are clear?
  • The beams hit around the center of windows?
  • The reflected beams on the windows are dumped?

IMMT1-IMMT2

• Beam clearance: no problem
• Beam position on IMMT2: shifted from the center.

IMMT2-PRM

• Main beam/misaligned beam clearances: no problem against the beam dumper
• The misaligned beam position: hits on the dumper(?) and the temp enhancement was detected.

Around PRM

• Beam position on PRM
• IR beam in the midsize baffles(HR/AR side)

Main Beam Dumper

• Thermometer works: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29340

• Visual Inspection: after the IR recovery. --> https://gokagra.slack.com/archives/C015MC5U0R1/p1714622532391079 so OK.

• Beam Clearance: OK with the main IR beam

Beam dump(T.Akutsu)

• some shiny remnant: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29343, https://klog.icrr.u-tokyo.ac.jp/osl/?r=29342

• Beam dumps were additionally added?
  • In basic, No Relocation was done?

PRM Cleaning (Hirata-san, Aso-kun)

PRM

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29254 (April 17): Acceptable ?

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29244 (April 16)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29228 (April 15)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29216 (April 12)

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29202 (April 11)

Oplev Check for PRM, IMMT1. (Yokozawa-kun)

Activities:

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29337

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=28916

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=28897

Beam Power

Beam Path Clearance

• IMMT1

QPD centering

Calibration

Spectrum Health

Oplev beam's stray light influence

• almost no light? as before.

Oplev table covering

• we will do this after closing.

ISS path

Check the path by Akutsu-kun

• https://klog.icrr.u-tokyo.ac.jp/osl/?r=29384

Vacuum system (Kimura/Uchiyama and their selected persons)

Close GV btw PRM and PR3 and stad bolt nut adjustment btw PRM and PR3

Clean inside as much as possible including the bellows duct with TMP

Check the flange seal surface condition where were opened.

• KF400 flange with a Copperplate -> change with a curved flange: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29377

Decide where the elastomer/Metal gasket will be used.

Check the opened flanges and the top hut of PRM

Logistic to reinstall the bellows duct with TMP.

• Sawada-sana and Mirapro members call
• If you use chain block, please be careful of its fixing
• Careful cramp tightening near oplevs.