= Agenda/Minutes of the VIS Meeting on 2020/2/7 =
2020/2/7 14:00 - 14:30

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

Participants: Takahashi, Hirata, Sato, Ishizaki, Aso, Okutomi, Tanaka, Lucia

[[https://paper.dropbox.com/doc/VIS-Commissioning-Task-List--AlK26n6oP8QHU_XUQriwv2PvAg-RKcNXfMFrqOtTAPU48qQf|VIS Commissioning Task List]]

[[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file,xlsx&authkey=!AMFNtNa-Y6CVp94|Post-O3 task list]]

[[https://www.dropbox.com/s/e0inlp006spuj4m/Schedule%20after%20O3.pdf?dl=0|Schedule afetr O3]]

[[https://www.dropbox.com/s/9l1h0fw9kc1pzmm/Proocurement%202019FY.xlsx?dl=0|Procurement list in 2019FY]]

== Progress report ==
=== Type-A ===
==== Past week report ====

 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=12824|klog#12824]]

==== Plan for coming weeks ====
=== Type B ===
==== Past week report ====
 * OPLEV box:
  * I have verbally requested information about the box for the TM oplev to the CRY group but there's no response yet.
  * I got more information from Akutsu-san about the box Mirapro designed for the MN oplev.
  * I'm making a a more suitable design using Mirapro's ideas and implementing the features requested in the previous meeting.
 * About SRM BF condition:
  * The keystone has a free range of ±130 um, presumably due to a screw that fell from upper stages which landed in the wrong place within the filer enclosure.
  * The current plan is to insert a small fibre optic camera (Ø3.9 mm) through one of the Ø5.2 mm holes at the base of the BF filter base.
 * Yokozawa-san turned off some turbo pumps in the central room, which produced the temperature to decrease.
  * The temperaure change in turn produced a drift in the DC control signals of GAS filters; in the worse case for Type B the signal reached around -18,000 counts in the BF top filter.
  * Later Yokozawa-san turned off the cooler near the BS clean booth and the temperature recovered to 23.7 degrees (23.8 degrees requested for O3).

==== Plan for coming weeks ====
 * I aim to finish the design of the SR top oplev box.

=== Type-Bp ===
==== Past week report ====
 * IP address of the picomotor in PR3 was wrong.
==== Plan for coming weeks ====
=== OMMT & OSTM ===
==== Past week report ====
==== Plan for coming weeks ====
=== VIS electronics ===
==== Past week report ====
 * Started investigation of LVDT-ACT coupling in the combiner circuit.
 * The combiner and the DC cable are necessary.
==== Plan for coming weeks ====
=== Other site works ===
=== Safety ===
== Discussion ==
== Travel Plans ==
 * Travel (Week of 2/10):
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Fujii:
  * Tanaka:

 * Travel (Week of 2/17):
  * Takahashi:
  * Sato: 19-21(shift)
  * Hirata: 20-22(shift)
  * Shoda: 18-20(shift)
  * Fujii:
  * Tanaka:

== Next meeting ==
On 2020/2/14(Fri)