= Agenda/Minutes of the VIS Meeting on 2019/5/24 =
2019/5/24 13:30 - 15:00

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

Participants: Hirata, Fabian, Sato, Ishizaki, Shoda, Fujii, Terrence, Aso, Okutomi,Akutsu

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

=== Type-A (Takahashi) ===
==== Past week report ====
==== Plan for coming weeks ====
 * I suggest the test of IP control with/without inertial damping in the engineering run in June.

=== Type B (Mark) ===
==== Past week report (written by Fabian) ====
 * Terrence implemented a filter for the inertial damping. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8905|8905]].
 * The  highlight of the week is Terrence's measurement of the residual motion  of the SR2 optic: as measured by the oplev, it does fulfill the RMS  displacement and velocity requirements for lock acquisition and,  partially, for the observation mode also. See the report at klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8949|8949]].
  * The  integrated RMS was calculated from 5 Hz to DC because there are some  peaks between 8 Hz and 10 Hz and whose origin still has to be clarified.  See the report at entries [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8918|8918]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8933|8933]].
  * After  Akutsu-san's suggestion Terrence improved the air shield in two rounds,  including a cylindrical cover around the viewport. This reduced the  noise by about a factor of 10.
  * He  realized setting up the shield may have slightly changed something in  the oplev and carried out another round of diagonalization.
  * He realized the H3 coil was not working. We fixed it.A cable was disconnected.
  * The  optic residual motion in L showed a large peaks close to 0.2 Hz, which  is where the micro-seismic may become apparent. The peak was not seen in  P or Y. The inertial damping system is likely not working in a suitable  way. The blending frequency is 0.190 Hz which may not be low enough.
  * At the end measurement of the residual motion reported  was carried out with inertial damping only in yaw.
 * Fabian, Terrence and Fujii-kun measured the settings of the SR2, BS LVDT drivers and one of SR2's. See klogs [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8941|8941]] , [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8951|8951]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8952|8952]].
 * Fabian worked more on the calculation of the amount of sensor noise injected:
  * I imported Panwei's OSEM noise measurements and calculated the virtual sensor noise.
  * I imported Fujii-kun's measuement of the geophone noise and calculated the virtual sensor noise.
  * I imported the blending filter
  * I wrote lots of comments in Sekiguchi-kun's Matlab scripts.
  * I will write a klog soon with preliminar results.
 * Fabian submitted and abstract for the Autumn JPS meeting on September.

==== Plan for coming weeks ====
 * Terrence will work in the optimization of the inertial damping.
 * We have to measure the settings of the SR3 LVDT driver.
 * Fabian will continue with the calculation and prepare a presentation for the conference in Brazil.

=== Type-Bp (Shoda) ===
==== Past week report ====

 * Satellite boxes are updated ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8928|klog8928]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8912|klog8912]])
 * LVDT driver boards are changed ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8956|klog8956]])
 * Stepping motor BO are connected ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8959|klog8959]])
 * Moderate WD is installed in PRM, and ready to be installed to the other PRs. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8939|klog8939]])

==== Plan for coming weeks ====
=== OMMT & OSTM (Takahashi) ===
==== Past week report ====
 * Sato-san is checking the 3D model of TAMA-PO type suspension in the overall model around the OMC.
 
==== Plan for coming weeks ====
=== VIS electronics (Tanaka) ===
==== Past week report ====
==== Plan for coming weeks ====
=== Other site works ===
=== Safety ===
 * Incidents:

 * Foreseen risks
  * Type-A:
  * Type-B:

== Discussion ==
 * Middle Sized Baffles
  * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10200|JGW-T1910200]]
 * TO DO List for O3
  * Hierarchical control of Type-A (with CRY)
  * Improved watchdog
    * Digital
    * Hardware
  * Type-B IP damping
    * Inertial or CMRR ?
  * Guardian
   * Type-A guardian missing
   * Type-Bp guardian improvement
    * Include the OpLev TM loop 
  * VIS status monitor screens
  * Operation manuals
  * L2P diagonalization for all the suspensions
  * Automatic off-load system

== Travel Plans ==
 * Travel (Week of 5/27):
  * Takahashi:
  * Sato:
  * Mark: Holidays
  * Hirata:
  * Shoda:
  * Fujii: 27-28
  * Tanioka:
  * Tanaka:
  * Terrence:

 * Travel (Week of 6/3):
  * Takahashi:
  * Sato:
  * Mark: Holidays
  * Hirata:
  * Shoda:
  * Fujii: 4-7
  * Tanioka:
  * Tanaka:
  * Terrence:
  * Fabian & Okutomi: Conference in Brazil until June 18th

== Next meeting ==
On 2019/5/31(Fri)