= Agenda/Minutes of the VIS Meeting on 2020/4/3 =
2020/4/3 14:00 - 15:30

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

Participants: Takahashi, Hirata, Sato, Ishizaki, Tanaka, Fabian, Aso, Okutomi, 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://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11475|Schedule afetr O3]]

== Progress report ==
=== Type-A ===
==== Past week report ====
 * Analysis of the tie-rods for corrugated tube.
 * Revising the [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5500|Type-A installation procedure]].
 * ITMY IP coil-magnet actuation got saturated (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13922|13922]]). Fabian (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13923|13923]]) and Lucia ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13932|12932]]) moved the IP with horizontal fishing rods
 * Designing the LVDT coils for the ACCs.

==== Plan for coming weeks ====
=== Type B ===
==== Past week report ====
 * By comparing pictures and the 3D-CAD Hirata-san realized the BS  large frame is missing some beams ([[attachment:BS_frame.png]]). Saito-san remembered Mirapro was not  able to put them in place because of a conflict with the clean booth  pillars. He has already requested Mirapro to redesign the beams. Let's  hope to install them before O4.
 * On  Sunday we did hammering test on SR2 chamber and on the duct between SR2  and SR3. Apparently the IFO lock endured the hammering test but lost  lock when we walked in front of the oplev. Looking more carefully to the  data is required in order to identify the trigger of the event. (See  klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13884|13884]].)
  * The channel '''K1:VIS-SR2_TM_OPLEV_LEN_YAW_OUTPUT '''went from -10 ndu to -74 ndu, which is out of linear range (-50 ndu to 50 ndu is the linear range).
  * TM-Y control actuation saturated.
  * Upon  request from Yokozawa-san I didn't move the QPD because he wanted the  commissioners to do it in order to recover the main IFO at the same  time.
  * Lack of communication on my part created a problem for commisioners (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13891|13891]]). Later Yokozawa-san and Nakano-kun moved the QPD and changed the TM-Y filter.
  * It  didn't seem to be necessary for the IFO but it would be good to check  oplev diagonalization again if there's a chance. The oplev seems to be  delicate.
 * I finished writing the oplev digonalization procedure for the Type-B suspensions.
  * Type-B: see [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/OpsManual/OpLev/TypeB/|oplev page]] in the wiki.
  * Type-A: see klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10786|10786]]. (Just a remainder.)
 * I offloaded coil-magnet actuators onto fishing rods or IM picomotors.
  * BS IP: F0 and F1 fishing rods are already at their limit  (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13927|13927]]).
  * SR3 IP (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13928|13928]]).
  * SR2 F0, F1 and IM: those fishing rods don't seem to have any problem (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13930|13930]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13935|13935]]).
  * Fishing rod information can be written in the  [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/OpsManual/FishingRods/|VIS Fishing Rod wiki page]]. (Just a remainder.)

==== Plan for coming weeks ====
=== Type-Bp ===
==== Past week report ====
==== Plan for coming weeks ====
=== Type-C ===
==== Past week report ====
==== Plan for coming weeks ====
=== VIS electronics ===
==== Past week report ====
 * Shaw the design of additional filters with the simulation. It has not been optimized yet.
 * It is difficult to combine two functions (additional filter and pin exchanger) because of the different location.
==== Plan for coming weeks ====
 * Check how small board is available.
== Safety ==
== Discussion ==
 * Plan for the long OR brake
  * Update without opening the chambers.
   * Signal generator cards for the LVDT driver.
   * Release sensor monitor.
   * Additional filters for the LVDT combiner.
   * New Oplev covers.
  * Temperature control.
  * New control scheme.

== Travel Plans ==
 * Travel (Week of 4/6):
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Tanaka:
 * Travel (Week of 4/13):
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Tanaka:

== Next meeting ==
On 2020/4/10(Fri)