• KAGRA
• Subgroups
• PEM
• Meeting
• 190716
• Minute

Minute of PEM meeting

• Date: 2019/7/16 17:00-18:00(JST) 10:00-11:00(CEST)
• Attendance:
• English meeting
• Join : Yokozawa, Oshino, Terrence, Fabian, Washimi, Kozakai, Miyo, Federico, Jan, TTanaka, Irene, Okawa, Fujikawa, Mori, Kaihotsu, controls, Yuzurihara, Yamamoto, Takahashi

=== Agenda ===

• General issue
  • 1st Engineering run Jun 8th (Xarm cavity)
  • 2nd Engineering run Jul 13th (MICH)
• each member progress
  • Yokozawa
    • KAGRA detector status

    • Update of the KAGRA PEM from last meeting pdf

  • Washimi　slide

    • Chromebook project (portable PEM)
      • light, compact PC, touch pads, type-A port
      • microphone, accelerometer, magnetometer
      • Portable microphone make easily
      • Visiting virgo
    • Sound reverberation time analysis
  • Miyo

    • Trend of the ground motion Link

      • Long term seismic motion
      • One seismometer analysis (Xend seismometer)
      • 3rd topic uses tow sesmometers
      • Be care of the treatment of the data quality
      • How about the time variance at the higher frequency region. (water flow?)
      • or human activities (on winter season) but activities was too small
      • very nice!
      • First peak is 60mHz-80mHz, similar analysis was done by Virgo team
      • Focusing on the very low frequency region by band limited analysis
      • Correlation and analysis
      • how to obtain phase velocity? Based on mark method.
  • Kozakai, Yuzurihara
    • Introduction of the glitch analysis
  • Federico, Irene, Jan
    • Virgo PEM
      • Trouble of the photo diode
      • Glitches trouble, shorter livetime
      • injection system to identify the glitch
      • Large glitch makes worse sensitivity
      • Magnetic noise injection and evaluate the transfer function
      • optical bench fluctuated by magnetic noise, making the scattering.
  • etc
• github progress