= 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, Yamat, Yamada, Yuzurihara
 * 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)
  * Move the MCE seismometer to PR2, more seisometer will be IXA
 * Sound injection (TTanaka) (10min)
  * Acoustic injection with Microphone 
  * Now KOACH filter was turned off
  * check the coupling between controls signals
  * PMC is sound noise dominant
  * Some coupling to the IMC controls signal
  * sound effect or vibration effect?
  * nokogiri wave
 * PEM injection plan (TTanaka) (10min)
 * Kozapy+ (Kozakai) (20min)
  * GWpy based library which can use in the Kashiwa server, kamioka server
  * condor job management by shell script
  * timeseries, and so on
  * userful shell script
  * PSL PEM at last year
  * Spectrogram with whitened data
  * Electronic ADC noise with 400Hz?
  * glitch plots with Yuzu summary page
  * trigger rate histogram
 * Report from DetChar (Yamamoto, Kokeyama) (10min)
 * Summary and future prospect (Yokozawa) (10min)