= Agenda/Minutes of the VIS Meeting on 2019/5/31 =
2019/5/31 13:30 - 14:30

[[https://zoom.us/j/203743987|Zoom Meeting]]

Participants: Takahashi, Shoda, Hirata, Aso, Tanaka, Ishizaki, Sato, Fujii, Terrence

== Progress report ==
=== Schedule ===
Site work schedule: [[|XLSX]]

=== Type-A (Takahashi) ===
==== Past week report ====
[Okutomi, Fujii, Yamada]

 * Measured the transfer functions of payloads by the oplevs.
 * Implemented the oplev servo block to the payload models.
 * Updated all the real-time models.　(The moderate WD system is implemented.)

==== Plan for coming weeks ====
 * Preparation for the ER on 8th.

=== Type B (Mark) ===
==== Report for the week 5/27 (written by Fabian) ====
 * Shoda-san implemented the moderate watchdog: when tripping the amount of actuation will ramp down to zero smoothly. Klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9009|9009]].
 * Terrence updated the BS guardian.
 * Terrence designed a VIS status monitor. The font might be too small for some people.
 * Terrence worked on SRM inertial damping.
  * There is coherence between the geophones and LVDTs at 0.1 Hz.
  * He designed a filter with a blending frequency of 0.110 Hz.
  * The system seems stable.
 * For SR2 Fabian calculated  the sensor noise fed back into the system by the control loop: entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8979|8979]].
  * The GAS filters' contrbution is too high.
  * I asked Enzo and he didn't rolled off the filters at higher frequecies.
  * Filter modification was assigned to Fabian.
 * Fabian and Yokozawa-san measured the settings of the SR3 LVDT driver. Klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9025|9025]].

==== Plan for coming weeks ====
 * Terrence will work in the inertial damping.
 * In  the weekly comissioning meeting Fabian made the commitment of writing a  list of the measurements we want to do with the DRMI for Type B  characterization.I will write it by next week and send it around for  comnents.

=== Type-Bp (Shoda) ===
==== Past week report ====
==== Plan for coming weeks ====
=== OMMT & OSTM (Takahashi) ===
==== Past week report ====
[Sato]

 * Started the design of OSTM suspension.

==== Plan for coming weeks ====
 * Taking out the MC-suspension from TAMA.

=== VIS electronics (Tanaka) ===
==== Past week report ====
==== Plan for coming weeks ====
=== Other site works ===
=== Safety ===
 * Incidents: no incident

 * Foreseen risks
  * Type-A: no
  * Type-B: no

== Discussion ==
 * Mechanical repair necessary after O3
  * Do we need to repair the ETMX F2 ?
   * We will not attempt to repair this before O4
  * Can we repair the ITMY BF Yaw pico ?
   * We will inspect the BF pico first. 
   * Depending on the cause of the trouble, we try to fix it.
  * Type-Bp magnet polarization problems (PRM IM and PR2 TM)
   * Estimate magnetic noise coupling first.
   * If the estimated noise is too large, we will attempt to fix the problem.
  * How to fix the Type-B FR problems ?
   * Can we fix the problem by re-adjusting the ballast masses ?
   * Check the details of the problem with Mark and Fabian.


== Travel Plans ==
 * Travel (Week of 6/3):
  * Takahashi:
  * Sato:
  * Mark:
  * Hirata:
  * Shoda:
  * Fujii: 3-7
  * Tanioka:
  * Tanaka:
  * Terrence:

 * Travel (Week of 6/10):
  * Takahashi:
  * Sato:
  * Mark:
  * Hirata:
  * Shoda:
  * Fujii: 10-14
  * Tanioka:
  * Tanaka:
  * Terrence:

== Next meeting ==
On 2019/6/7(Fri)