= Minute of PEM meeting =
----

 * Date: 2019/7/16 17:00-18:00(JST) 10:00-11:00(CEST)
 * Attendance: 
 * English meeting
 * Join : Yokozawa, Oshino, Terrence, Fabian, Washimi, Kozakai, Miyo, Federico, Jan, TTanaka, Irene, Okawa, Fujikawa, Mori, Kaihotsu, controls, Yuzurihara, Yamamoto, Takahashi

=== Agenda === 

 * General issue
  * 1st Engineering run Jun 8th (Xarm cavity)
  * 2nd Engineering run Jul 13th (MICH)
 * each member progress
  * Yokozawa
   * KAGRA detector status
   * Update of the KAGRA PEM from last meeting [[attachment:PEM_meeting_190716.pdf|pdf]]
  * Washimi　[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10447|slide]]
   * Chromebook project (portable PEM)
    * light, compact PC, touch pads, type-A port
    * microphone, accelerometer, magnetometer
    * Portable microphone make easily
    * Visiting virgo
   * Sound reverberation time analysis
  * Miyo
   * Trend of the ground motion [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10443|Link]]
    * Long term seismic motion
    * One seismometer analysis (Xend seismometer)
    * 3rd topic uses tow sesmometers
    * Be care of the treatment of the data quality
    * How about the time variance at the higher frequency region. (water flow?)
    * or human activities (on winter season) but activities was too small
    * very nice!
    * First peak is 60mHz-80mHz, similar analysis was done by Virgo team
    * Focusing on the very low frequency region by band limited analysis
    * Correlation and analysis
    * how to obtain phase velocity? Based on mark method.
    * 
  * Kozakai, Yuzurihara
   * Introduction of the glitch analysis 
  * Federico, Irene, Jan
   * Virgo PEM
    * Trouble of the photo diode
    * Glitches trouble, shorter livetime
    * injection system to identify the glitch
    * Large glitch makes worse sensitivity
    * Magnetic noise injection and evaluate the transfer function
    * optical bench fluctuated by magnetic noise, making the scattering.
    *  
  * etc

 * github progress