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   * He investigated the noise between the FFU on and off more precisely
   * Line noises
   * Noise level was decreased at the 100Hz region
   * Disappear the 145Hz peak
   * He also tried to evaluate the coupling function by regarding the FFU as the injector
   * PEM injection for global area is not so significant, local injection is more significant

Weekly PEM meeting

  • 2020/01/08(Tue) 16:00-(JST)
  • Regular meeting meeting (Japanese)
  • Web meeting with Zoom2 (Zoom2)

  • member : Ohkawa, Oshino, TT, Kozakai, Washimi, Tomaru, yamat

Each progress

  • General issue
    • What is the material of the periscope at the REFL table?
    • How about LV meeting?
      • If we can get the result, it is better to join the GWADW at Hokkaido
    • It is better to join the young meeting at Kamioka
  • Yokozawa
    • Suspension resonant frequency (with CRY and VIS team)
      • Yamada-san proposed the resonant peaks for Type-A
      • 46Hz peak come from IM-PIT?
      • Protect the optical lever from the wind
    • Post ER report1
      • Stopped the FFUs and vacuum pumps.
      • We couldn(t detect the difference in the floor, but we could identify the some peaks
    • Planning toward the O3 run
      • Discussed in the general issue
  • Washimi
    • post ER JGW-G2011165

      • He investigated the noise between the FFU on and off more precisely
      • Line noises
      • Noise level was decreased at the 100Hz region
      • Disappear the 145Hz peak
      • He also tried to evaluate the coupling function by regarding the FFU as the injector
      • PEM injection for global area is not so significant, local injection is more significant
    • Beam jitter study (Follow Camilla study, reported by Yokozawa?)
    • Sound reverberation study (KAGRA & Virgo)

  • Kozakai
    • Trigger analysis with ER run for the part of the PEM
    • 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/200107/Minute (last edited 2020-01-08 05:30:54 by TakaakiYokozawa)