Weekly PEM meeting

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

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

General announcement

• New fiscal year start
  • If you have idea for new schience and new project, please contact to Yokozawa

• 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)
  • First meeting would be 7th Apr.

Meeting and Conference issue

• TOBA and Gravity Gradient Workshop

  • JGW-G2516567

  • Various discussion
• 4/11 : FS地震学　B02班研究集会 ＠ 地震研
  • Washimi will have a presentation

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

  • Yokozawa will have a presentation
• 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

• 5/25~28 : KIW12 @ 上海 url

• 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
  • Kaku+ (??)

  • Kyoto U. DPRI & Korea NIMS (5/23)

• From Kamioka
  • Washimi (Tokyo 4/11)
  • Yokozawa (Tokyo 4/22-24)
  • Yokozawa (JAXA 5/9-10??)
  • Yokozawa (Kashiwa 5/14-16??)
  • Washimi (Sardegna, Middle of June - Middle of July?)

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

Jurnal paper issue

Details are here!

• Non-linear ICA paper
  • Now we discussed about the playground
• Schumann Resonance paper
  • Long term observation, seasonal variance
  • Amplified inside the mine
  • Others
• O4 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 url

    • IFI treatment
      • Found the loosed screw in STM2
      • Clear improvement 128 Hz, 220 Hz
    • Added the de-whitening filter to Type-A GAS filter
      • Disappeared the peaks around 20 Hz
    • Reducing the RMS of the DARM error
      • For the weaker coil driver
      • Installed the switching circuit
    • Damping the peaks around 40 Hz
    • PEM injection test
      • Washimi-san will report it
  • Cooler status
    • One cryocooler for duct shield was several trouble
    • We carefully checked it
  • Noise budget

• 出張PEM injection (planning form)

Preparation for O4b

• Coil preparation for magnetic injection
  • Done
• Voltmeter preparation
  • AC power monitor installation
  • DC power monitor installation

Progress report

• Ohashi
  • Microseismic noise with machine learning
• Kaku
  • Magnetic field
• Murofushi
  • Earthquake and GIF noise
• Ozaki
  • Nearby earthquake
• Obara
  • Earthquake and suspension
• Kume, Ueno
  • Noise subtraction
• Nishizawa
  • Water newtonian noise
  • Magnetic field analysis
• Washimi
  • PEM injection
• Yokozawa
  • Noise hunting

Place for memo

• Line noise list in O3a public data

• Summary page for KAGRA O3 vector dark matter