= Agenda/Minutes of the VIS Meeting on 2020/5/22 =
2020/5/22 14:00 - 15:20

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

Participants: Takahashi, Hirata, Fabian, Miyo, Sato, Shoda, Aso, Lucia, Tanaka

[[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file,xlsx&authkey=!AMFNtNa-Y6CVp94|Task list towards O4]]

[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11475|Schedule afetr O3]]

== Progress report ==
=== General ===
=== Type-A ===
=== Type-B ===
 * After a verbal report from Lucia last week I checked the condition of SR2: the control system couldn't bring the IP to its set point (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14381|14381]]).
  * On Monday Lucia and I came to the site.
  * We realized coil-magnet actuation didn't move the IP but horizontal fishing rods did, so we suspected the electronics or cabling.
  * With Yamamoto-kun we went to the tunnel and realized the HPCD had broken down (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14394|14394]]).
  * Thanks to Tomura-san's quick reaction we got a new HPCD and recovered the IP and the suspension (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14395|14395]]).
  * I don't know what's the origin of the failure. It wasn't an actuation overload due to an earthquake because there was no earthquake (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14407|14407]]).
  * A similar event happened to the BS IP on the 5th of May (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14404|14404]]).
 * I have been measuring decay times of the SR2 suspension on Thursday and Friday from the control room (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14413|14413]]). There are no final results to show yet.
 * I asked a few elementary questions about inertial damping (questions [[https://www.dropbox.com/s/g1q38sgbgocthbu/Inertial_damping_questions_fabian.pdf?dl=0|here]]). Thank you very much Takahashi-san and Terrence for their answers! :D

=== Type-Bp ===
=== Type-C ===
 * Making the 3D model of IMMT2 suspension.

=== Controls ===
 * Summarizing the GUARDIANs.

=== Electronics ===
 * Ordered the parts for test and prepare for the test.

== Post O3 ==
 * KAGRA is in the suspended mode until 31st May.
 * Only measurements, which can be done remotely, are available ([[https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit?usp=sharing|Request]]).
 * O3c is still under discussion between LVK ([[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]], [[https://www.dropbox.com/s/hoadb73fdyah02c/Post-O3%20task.xlsx?dl=0|Sheet]]).
 * The site work towards O4 will be started from July at earliest.

== Safety ==
== Discussion ==
 * Submission to JPS/ASJ Meeting.
  * JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun. (Takahashi, Shoda, Fabian)
  * ASJ Meeting: 8-10 Sep. Online, Deadline: 9 Jun.
 * Report "KAGRA observation run: performance of the Type A suspensions" (Check the attached file in kagra-seis).

== Travel Plans ==
== Next meeting ==
 * On 2020/5/29(Fri)