Weekly PEM meeting

• 2025/01/24(Fri) 17:00-
• Regular meeting

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

General announcement

• Author list 2024
  • Thank you for your contribution
• Virgo ENV member visiting
  • KAGRA 2/17 - 3/8
  • Plan
    • Noise hunting (PEM injection) toward the 10 Mpc would be first priority
    • IFI characterization (not decided)
    • OMC shround installation (not decided)
    • Measurement of the coldbox in somewhere Japan
• O4a noise budget paper
  • If you have a plan to write the paper using O4a data and PEM, please let me know.
• Start the investigation for the new subsystem, noise subtraction, under the SEO.
  • Establish

Meeting and Conference issue

• TOBA and Gravity Gradient Workshop
  • Now discussing among the member
  • Candidate 3/14 - 15
• JPS meeting
  • Online
  • Ohashi
    • Estimation of the microseismic motion at the KAGRA site using neural networks (II)
  • Sato
    • 重力波望遠鏡KAGRAにおける音響雑音

• Other meetings url

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

Business travel

• To Kamioka
  • Virgo member (2/17 - 3/8)
  • Sato Niigata.U (2/12-21?)
  • Aoyama group (2/24 - 2/28)
• From Kamioka
  • Yokozawa (Tokyo 2/25,26)
  • Yokozawa (Kashiwa, Tokyo 3/12-15)

General issue

• Commissioning
  • PRFPMI
    • cooling down is performing
      • All suspensions achieved 88-89 K, keep this temperature
    • Optical table treatment for high power operation done
      • Installing the BS or reducer to avoid the PD saturation
      • 10 W IFO lock (PRFPMI RF lock) performed ~ 5 min, need the tuning of the ASC with high power
      • and we need to add the 1.7 Hz L damping, trial using the PF oplevs
    • Noise budget performed (before cooling down)

      • klog32360

• 出張PEM injection (planning form)

Jurnal paper issue

Details are here!

• O4 PEM paper
  • Start to investigate the topics
• Schumann Resonance paper
  • Todo list work
• 1 Hz seismic motion paper
  • Start the investigation

Preparation for O4b

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

Progress report

• Sato
  • Acoustic injection analysis
• Ohashi
  • Microseismic noise with machine learning
• Kume, Ueno
  • Noise subtraction
• Nishizawa
  • Water newtonian noise
  • Magnetic field analysis
• Washimi
  • Preparation of the injection tools
• Yokozawa
  • Noise hunting

Place for memo

• Line noise list in O3a public data

• Summary page for KAGRA O3 vector dark matter