Weekly PEM meeting

• 2025/04/25(Fri) 17:00-
• Regular meeting

• Zoom2 : https://zoom.us/j/6676627462

General announcement

• Schumann resonance paper review

• O4c url

  • Now commissioning break, Re-start 4th June end 7th Oct.
    • Discussion about the engineering run
  • KAGRA will join this with 10 Mpc sensitivity
• Bi-weeklky VK PEM meeting
  • To discuss the analysis during their measurements
  • Monday 17:00-(JST)

  • Next 28th Apr., 2025 12th May 2025

• 「地震学(井出)」輪読ゼミ
  • 毎週火曜10時~
• 休日シフト募集中
  • 三代木さんのメール参照

Meeting and Conference issue

• 4/23,24 : From QUarks to Neutron Stars * url

  • Yokozawa will join the meeting
• 5/9~10 : JGWC研究会 @ JAXA相模原

  • url

  • 発表申込締切：2025年4月7日（月）
  • 参加登録締切：2025年4月21日（月）

• 5/19~23 : GWADW2025 @ フロリダ url

• 5/26~27 : KIW12 @ 上海 url

  • Yokozawa will join the meeting

• 5/26~30: ET symposium @ ボローニャ url

  • 締切：3/31

• Other meetings url

If you have some presentations about PEM related, please contact to me.

Business travel

• To Kamioka
  • Obara (4/29 - 5/1)
  • Ozaki (5/18-24)
  • Kaku+3M1 (5/18-24)

  • Kyoto U. DPRI & Korea NIMS (5/23)

• From Kamioka
  • Washimi (Tokyo 4/11)
  • Yokozawa (Tokyo 4/22-24)
  • Yokozawa (China 5/25-28)
  • Washimi (Virgo/Roma/Sardegna/Padva, 6/10 - 7/12?)
    • Return Virgo's mini-ACC
    • ET SPB work at Sardegna : 6/16 - 7/4 or more

  • Washimi (Yamaguchi -> Hiroshima -> Kohch -> Okayama, 9/8-9/30?)

Jurnal paper issue

Details are here!

• Non-linear ICA paper
  • The playground approved, preparation toward the submit
• Schumann Resonance paper
  • Long term observation, seasonal variance
  • Amplified inside the mine
  • Others
• O4(a+c) PEM paper
  • Start to investigate the topics
• Microseism with machine learning
• 1 Hz seismic motion paper
  • Start the investigation

General issue

• Commissioning
  • PRFPMI
    • Latest sensitivity ~6.0 Mpc by adjusting the alignment offset
    • Reducing the RMS of the DARM error
      • For the more low power coil driver
      • Install the registance to reduce the circuit noise
      • Update the control
    • Searching the good alignment
      • By adding the offset to the ASC loop, we search the better sensitivity alignment
      • We need the OMC ASC (Beacon) to perform more stable
    • CARM noise investigation
      • 116 Hz noise is still mystery
        • Tapping test at Saturday
    • PEM injection test
      • Reported in commissioning meeting
      • Washimi-san will report it
  • Noise budget

Progress report

• Nishizawa, Taruya, Himemoto
  • Water Newtonian noise
  • Schumann Resonance

    • http://arxiv.org/abs/2504.06653

• Kaku
  • Magnetic field analysis
• Murofushi
  • Earthquake and GIF analysis
• Ozaki
  • Nearby earthquake
• Obara
  • Earthquake and suspension
• Ohashi
  • Microseismic noise with machine learning
• Kume, Ueno
  • Noise subtraction
• Yokozawa
  • PEM investigation PR3 - PRM
• Washimi
  • PEM injection

Place for memo

• Line noise list in O3a public data

• Summary page for KAGRA O3 vector dark matter