• KAGRA
• Subgroups
• PEM
• Meeting
• 200107
• Minute

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?)
    • Only 80Hz vibration injection
    • Table may vibrate at 60Hz

  • Sound reverberation study (KAGRA & Virgo)

    • Auto pulse finding program
    • Automate fitting with background tuning
    • Yend Aco has 1.5Hz resonant peak
• Kozakai
  • Trigger analysis with ER run for the part of the PEM
  • Offline detchar report for the part of the PEM
• TTanaka(ICRR)

  • shaker injection with FPMIspeaker@12/8,shaker@12/15,meeting pdf

  • Master thesisthesis

• Fujikawa
  • Lock loss study2
  • fujimopy
• TTanaka(Niigata)
  • Magnetic field from air cooler and compressor
  • Magnetic field injection to AS and REFL table
• etc
  • Pick up the items for the concern about the power supply and cabling
  • Check the cabling between rack and rack
  • Rack layout (for example, the Type-B use same circuit, rack design was different)
  • Use company for the cable re-connection
  • Reduce the plastic circuits