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  * Introduction of the chromebook
  * access by USB or inner monitor
  * Evaluation the sound from the beam duct ~2kHz
  * Vacuum pump vibration?
  * Want to evaluate the effect to the scattered light
  * We will buy the accelerometer with USB
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  * Acoustic injection with Microphone
  *

Minute of PEM meeting


  • Date: 2019/6/11 16:00-18:00(JST)
  • Attendance: Yokozawa, Washimi, Miyo, Kozakai, Oshino, Mori, Miyoki, Okawa, Fujikawa, TTanaka, Kaihotsu, Kokeyama
  • Expand meeting

=== Agenda ===

  • PEM status (Yokozawa) (10min)
    • 2nd installation was almost finished, need the check of the chamber PEMs
  • Virgo PEM measurements (Yokozawa) (10min)
    • Sound decay measurement
    • IYC chamber characterization
    • Comparison between Virgo and KAGRA
  • Characterization of the EXC chamber (Washimi) (10min)
    • Why EXC? Removed the cryopayload and prepared ADC. Additional measurement by IYC
    • FFU on/off
    • Around 1Hz from cooler, 20.45, 30.62, 60.94, ... No problem to KAGRA sensitivity
    • Evaluate the magnetic field by simulation after closing the chamber.
    • Acoustic measurement, 13-59Hz and more than 1kHz from cooloer. (also, about 10kHz with 2Hz frequency)
    • Coherence observed from only the fan
    • 2Hz did not appear at the chamber accelerometer
    • X-end PEM models
    • Before/After cooling down
    • 0.5 deg increasing by the ondotori
    • Thunderstorm was detected by magnetometer, gorogoro
    • DC supply no significance difference before/after cooling
    • mag 1,3Hz appear
    • sound some line appear, but FFU was on.
  • Power supply monitors (Washimi) (10min)
    • DC power monitor for the 18/24V
    • noise floor is limited by ADC noise
    • 60Hz was observed
    • 100Hz AC was quite dirty
    • Need the more safety AC monitor
    • We need to focus the power supply issue continuously
  • Acoustic and magnetic field measurement (Kaihotsu) (10min)
    • With KIW6 slide
    • Acoustic/magnetic field map generation
    • 300Hz peak for the acoustic spectral
    • 100Hz comes from air cooler?
    • 1Hz magnetic field from the air cooler
    • position dependence of the 1Hz amplitude around OMC
    • Sotsuron was uploaded to the KAGRA wiki, preferred to upload to JGWDoc
  • Current PEM measurements (Mori) (10min)
    • Introduction of the chromebook
    • access by USB or inner monitor
    • Evaluation the sound from the beam duct ~2kHz
    • Vacuum pump vibration?
    • Want to evaluate the effect to the scattered light
    • We will buy the accelerometer with USB
  • Ground motion (Miyo) (10min)
  • Sound injection (TTanaka) (10min)
    • Acoustic injection with Microphone
  • PEM injection plan (TTanaka) (10min)
  • Kozapy+ (Kozakai) (20min)
  • Report from DetChar (Yamamoto, Kokeyama) (10min)

  • Summary and future prospect (Yokozawa) (10min)

KAGRA/Subgroups/PEM/Meeting/190611/Minute (last edited 2019-06-11 17:44:51 by TakaakiYokozawa)