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  * December 17-24 24h engineering run
   * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/EngineeringRun/ER191217_24/ | wiki]]
   * We also held the post ER. We turned off the FFUs and vacuum pumps
  * Lock acquisition to PRFPMI
  * There is still some peaks in the lower frequency
   * Type-A resonant frequency [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11116|JGWDoc11116]]
  * Peaks appeared at higher frequency
   * PEM injection to REFL table
  * After that, we will move to noise hunting		   * Finally, we can lock the PRFPMI
   * Transmittance laser power became 100 times higher than FPMI
   * Lock duration is about 30min at maximum
  * OMC commissioning is also ongoing
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 * PEM plan January
  * Identification of the ~100Hz noise source
   * (Maybe, ) the dominant noise for lower frequency may come from suspension
  * After the success of the PRFPMI (or chance to operate the FPMI), we would like to do following things
   * Understanding the coupling function detected at the refl table
    * At the some point, we detected the larger coupling function
    * Periscope or some optics?
  * We would like to inject sound or vibration to AS, POP and TMS table		  * New PEMs
  * We bought the ACO power supply, microphone and accelerometers(end of Feb.)
  * Basically the portable PEMs

 * PEM plan
  * PEM injection to optical table
  * Hammering test

Weekly PEM meeting

  • 2020/01/28(Tue) 16:00-(JST)
  • Regular meeting meeting (Japanese)

  • Web meeting with Zoom2 (Zoom2)

Agenda

General issue

  • Interferometer status
    • Finally, we can lock the PRFPMI
      • Transmittance laser power became 100 times higher than FPMI
      • Lock duration is about 30min at maximum
    • OMC commissioning is also ongoing

    • ~100Hz noise and line noise of the higher frequency -> PEM

  • New PEMs
    • We bought the ACO power supply, microphone and accelerometers(end of Feb.)
    • Basically the portable PEMs
  • PEM plan
    • PEM injection to optical table
    • Hammering test
    • Long term PEM evaluation
  • PEM festival
  • Conference
  • PEM injection
    • Shaker injection1 (TTanaka, Yokozawa)
    • acoustic injection (TTanaka, Yokozawa)
      • PSL, REFL and AS table injection
      • Analysis is ongoing
    • magnetic field injection (Niigata Tanaka, Fujikawa, Yokozawa)
      • Effect of the air cooler magnetic field
      • AS, REFL table injection
      • He is writing the thesis
  • Newtonian noise measurement
    • Thank you for Virgo PEM member!
    • Francesca mainly measured the newtonian noise
    • We will discuss in 21st. Jan.(Virgo KAGRA PEM meeting)
  • PEM measurement
    • Someday : Effect of the sound to DARM displacement
    • Someday : Environmental check around BS (including the POP)
    • Someday : Evaluation of the table cover
    • Someday : SR2 and SR3 optical lever (Reflection light from SRM?)

Each progress

  • Yokozawa
    • Planning toward the O3 run
  • Washimi

    • Preparation for the hammering test @ Y-end klog

    • Sound reverberation study (KAGRA & Virgo)

  • Kozakai
    • Offline detchar report for the part of the PEM
  • TTanaka(ICRR)
  • Fujikawa
    • Lock loss study2
    • fujimopy
  • TTanaka(Niigata)
    • Magnetic field from air cooler and compressor
    • Magnetic field injection to AS and REFL table
  • etc

KAGRA/Subgroups/PEM/Meeting/200128/Agenda (last edited 2020-01-28 13:59:39 by chihiro.kozakai)