== CAL Meeting on 2017/1/20 13:00- 14:30 ==
Participants : Inoue, Michiura, Shishido, Tomaru, Ushiba, Yamamoto, Yokozawa, Haino

=== Minutes ===
 * Pcal/camera developments (Inoue) [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6051|slides]]
   * YI will go to LIGO Hanford to finalize the Pcal design and have a review (end of Feb. ~ beginning of March)
   * Prototype setup of Pcal and camera is made at KEK
   * The detailed schedule was already submitted to SEO and in general approved (a few adjustments needed with other subsystems)
   * 20w fiber LASER was already ordered
   * Transmitter/Receiver modules will be ordered in the next fiscal year
   * To do things by June
    * Camera window, Holes position, Weight scale, Wide-range mirror, In-vacuum stage

 * Measurement of the transfer function of AA/AI filters (Yamamoto,Yokozawa)[[attachment:calibration_meeting_170120.pdf|横澤pdf]]
   * AA/AI filters are used for all the ADC/DAC so it is important to make sure there is no individual variation
   * A setup has been made in Dec./2016 for the measurement of the transfer function of AA,AI,whitening filters
   * The measurements are on-going by Kamioka staff and data are being analyzed by Yamamoto-san

 * Review of iKAGRA calibration (Michimura) [[attachment:iKAGRACalibrationSummary.pdf]]
   * iKAGRA calibration was done very quickly so the information (e.g. channel names) was not well shared
   * For bKAGRA calibration, we should have plans in advance to be shared by related groups/people 
   * Calibration lines (80, 135 Hz) in iKAGRA were decided with no specific reason, but just to be close to UGF ~100 Hz
   * The actuator efficiency of iKAGRA was measured for the X,Y combined system for DARM instead of each X and Y
     * It was known that there was a delay between X and Y actuation but it was turned out to be small (by Yokozawa-san) 
   * The models were taken from CLIO ones; It is needed to make new models for bKAGRA
   * Measurements/modeling of transfer functions for type-A suspension (room temperature part) is expected to be done by VIS (Okutomi-san); but to be confirmed
   * Measurements/modeling of transfer functions for cryopayload will be done by CRY (Miyamoto-san)
    
 * AOB
   * Yokozawa-san officially joined the Calibration subsystem to work on digital system, hardware injection study, and so on