= Agenda/Minutes of the VIS Meeting on 2019/8/16 =
2019/8/16 14:00 - 15:30

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

Participants: Takahashi, Fabian, Aso, Tanaka, Ishizaki, Lucia, Fujii, Miyo, Shoda

== Progress report ==
=== Type-A ===
==== Past week report ====
 * For the 150mHz-ish mode damping
  * sensor correction for IP, i.e., seismic signal subtraction system, was implemented to all the type-A suspensions.
  * BF-L/T damping was also implemented for this damping.
   * The RMS was suppressed by a factor of like 2.7, log [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9961|9961]]
  * (SC at IP) + (BF-L/T) made the system quieter compared to the previous, however, it was not enough
   * IP-TF does not have the peak at 150mHz-ish.
   * BF-actuation efficiency is not so high.
   * => we will try to the feedback like BFl to IPL, or TML to IPL, for the next.
    * For this purpose, we have to modify the model again.

 * For inertial damping performance test, LVDT damping vs. inertial damping > By Lucia
  * ETMY: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9981|9981]]
  * ITMX: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9995|9995]]
   * What is the summary for this week?

 * length-oplev calibration with green lock
  * log: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9989|9989]]
  * 1st trial. The values are *NOT* installed to the MEDM since we could not guarantee if we were observing TML motion not TMY motion. It looks they are not terrible values, compared to ground motion though.

 * F3-GAS of EY: looks stacked again
  * log at 2019 Aug. 15th, when it was stuck: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9990|9990]]
  * log at 2019 Aug. 15th, when it was free: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9293|9293]]
   * The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.

 * ETMY health check
  * lopg: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9996|9996]] => status and plan?

 * Listed up the modification parts in the 3D CAD model.

==== Plan for coming weeks ====
 * Guardian stuff
  * utilize the TMY to BFY loop again, etc.
 * RTmodel modification
  * make paths from TM to IPL, BFL to IPL.
 * 150mHz-ish suppression
  * implement loops like TM to IP.

=== Type B ===
==== Report for the week 15-08-2019 ====
 * Shoda-san improved the SR3 optic yaw motion (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9949|9949]]).
  * Improvement  in the frequency band from 1 Hz to 2.3 Hz was achieved by modifying the  IM-Y filter. The problem was not enough phase margin.
  * There's still a peak at 1.3 Hz.
  * She also modified the IM SENSALIGN matrix (diagonalization according to resonance peaks?)
  * Transfer functions should be measured again.
 * The BS optic has a large peak at 150 mHz (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9991|9991]]).

==== Plan for the week 19-08-2019 ====
 * Enomoto-kun requested to extend the oplev control loop down to where the micro-seismic peak is. (Fabian.)
 * Assemsment of the motion of the SR optics around the micro-seimic region. (Due today.)

=== Type-Bp ===
==== Past week report ====
==== Plan for coming weeks ====
=== OMMT & OSTM (Takahashi) ===
==== Past week report ====
 * Ordered the dummy mirror to be used for gluing test.

==== Plan for coming weeks ====
=== VIS electronics ===
==== Past week report ====
==== Plan for coming weeks ====
=== Other site works ===
=== Safety ===
 * Incidents:

== Discussion ==
 * For the people in Kamioka, checking the presence/absence at the site will help us (not only for Mitaka persons).

== Travel Plans ==
 * Travel (Week of 8/19):
  * Takahashi: 22-24(F2F)
  * Sato:　
  * Hirata:
  * Shoda:
  * Fujii: 19-24 
  * Tanaka:
  * Fabian: 22-24(F2F)

 * Travel (Week of 8/26):
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Fujii: 26-30
  * Tanaka: 26-30

== Next meeting ==
On 2019/8/30(Fri)