• KAGRA
• Commissioning
• Meetings
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• StrategyMeeting

Commissioning Strategy Meeting (2023/2/17)

• 3 months + 1 week to O4a start (24 May)
  • Golden Week holidays(3-7 May)
  • GWADW2023 (21-27 May)
• Daily commissioning strategy is necessary!
  • More precise time sharing and assignments are necessary.

  • Can we work in KAGRA from am 5:00 ?? -> Consult with Ohashi-san

  • How much late is allowed in the night?? -> Consult with Ohashi-san

• Topics on the sensitivity enhancement
  • Seismic noise isolation of OMC?? (~ 6 months??)
    • where is the noise due to the "normally expected" seismic noise?
    • Some selection

      • no opening vacuum tanks <- low seismic noise environment to realize 1-3Mpc

      • opening vacuum tanks <- if scattered light ? new injection path is also possible.

    • TMPs were off on OMC/SRM at present.
    • Seismic noise is still larger than O3GK now.

    • Can we reach the O3GK sensitivity level if we can realize the low seismic noise level? -> Washimi-kun -> We can reduce or not

    • If we open OMC, what should we check?
      • scattered light on the cable? that was identified by Akutsu-kun.
      • Bleade spring resonance? No data.
      • Up conversion noise implies scattered light noise?

        • OSTM swing to check the scattered lights? -> Ushiba

        • Slow actuation of suspension -> PEM team

        • Hummering/acoustic test?
    • stable noises also exist.
  • 3 mirrors(IX, IY, EY) cooling(~2 months(assuming "1 month for one mirror" and "one cooling in one arm at the same time".)
    • How much commissioning time will be used for
      • suspension height adjustment
      • drifting
      • PY/L coupling adjustment

      • resonance mitigation control in -> minor adjustment is enough, mainly in gain.

    • What is the milestone
    • Cryocooler effects is serious or not? According to Yamada-kun's thesis, no effect for the designed sensitivity.
      • We can check by just operating motors.
      • We get peak noises nad enhanced noises for the frequency range of 10~100Hz.
      • Seismic noise comparison?
    • Can we cool during O?
  • Control of PRFPMI+DC

    • ADS/ASC/WFS for arms to mitigate the contrast fluctuation -> Ushiba

      • mysterious off set problems
      • under investigation.
      • Check the TMSX to kill scattered light.

      • ETMY covering -> check effect

      • ADS in FPMI
    • Enhance OMC lock-acquire stability?
      • more guardian improvement(Ushiba, Aso)
    • More dynamic range of PNC-X?
  • Laser
    • HPL usage for IFO (120W to Toyama U, Characterized New 60W to KAGRA)
      • After noise-hunting

    • HPL in Toyama U (new 60W characterization -> KAGRA, Repair of 120W from KAGRA)

      • Laser power increase strategy -> Arm cavity instability mainly of Pitch.

        • Many measures were prepared. So this pitch can be suppressed. Not so serious.
    • What is the milestone to change HPL
      • 1Mpc ?
      • noise budgeting?
      • PLL adjustment is bothering us!!
    • ISS
      • below 3Mpc line. However, bad alignment will produce a line noise.
  • Noise hunting, reduction, budgeting
    • MICH
      • noise budgeting is important.
    • PRCL
      • noise budgeting is important.

    • Suspension control around <100Hz for some suspensions

      • local control optimization(filter correction) to reduce the contrast fluctuation? -> Ushiba + alpha

      • no problem in IMC controls

      • we need a summary!!(http://172.16.34.76/past_data_viewer/fig_nb/2023/0215/noise_budget_2023-02-15_12:05:26.png)

        • upload this link in JGWdoc/Dac wiki? -> Yuzurihara-kun

    • Suspension control around the micro-seismic area
      • try the bottom filter dumper sensor correction in L
      • Terrence method trial in future
    • PEM/DetChar activities
    • Whitening filter apply
    • REFL power up
  • MISC

    • Remove unnecessary stuff from the isolated area, especially around OMC. -> Miyoki

    • OMC: some cabling should be reset. -> Miyoki

    • Environment cleaning. -> Miyoki

• Topics on maintenance for the long operation
  • Vacuum stuff

    • Ion pump operation estimation -> Who (Kimura, next week) -> Next week schedule.

    • -> do as soon as possible.

    • TakahashiR-san maybe. + Takahashi-san, Yasui-san
  • Cryo-coolers
  • Air conditioning Coolers/heaters -. Miyoki
  • Seasonal water drainage
    • Yarm pumping mid March - mid May