= Agenda/Minutes of the VIS Meeting on 2020/5/29 =
2020/5/29 14:00 -

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

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

[[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 towards O4]]

== Progress report ==
=== General ===
=== Type-A ===
 * As reported by Yamamoto-san ( see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14432) F1 GAS output was satured. So Yesterday I offloaded the GAS output by changing the offset on F1 and F2 (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14434)
 * I took advantage of the suspended mode of KAGRA to investigate some strange response of the geophone installed on the Type A suspension. The test has been done with EX geophone. Basically,  I changed the cutoff of the calibration filter from 10 mHz to 3 mHz and I measured the TF= GEO/(LVDT*w). By moving back to 3 mHz the DC cutoff the phase shift is reduced a lot, but the DC noise is growing up. I turned on the ID with blending at 140 mHz: the loop is stable, but the 148 mHz peack got excited (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14443).



=== Type-B ===
 * I worked in the measurements of the decay times of SR2. I still have to analyze data. No results to show yet.
 * Washimi-san reported the feedback signal in SRM F0 was too high. I offloaded onto the fishing rod this morning (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14436|14436]]). According to the [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/OpsManual/FishingRods|VIS wilki fishing rod page]], this fishing rod does not suffer of any known problems.
 * I will postpone asking questions about inertial damping again for next week.

=== Type-Bp ===
=== Type-C ===
 * 3D CAD model of the present IMMT2 suspension is completed.

=== Controls ===
 * Working on the Type-A situation reproduction, which was assigned at cryo-payload upgrade review. (Shoda)
 * Comparing the IP performance from the design.

=== Electronics ===
 * Test parts have been delivered.
 * The experiment will start from the week after next week.
 * Test of the LVDT card modification on the grounding is planed.

== Post O3 ==
 * KAGRA is still in the suspended mode. Only remote measurements are available until May 31st (Q-measurement by Fabian, Type-A measurement by Lucia).
 * More activities in the control room and the site will be available from June 1st (Noise budget by Ushiba).
 * Decision for O3c in Virgo will be done within two weeks (from EO). If O3c was decided, task for O3c will be available as well (e.g. Sensor correction for SRs).
 * Post Obs. task has priority higher than task for O3c. Two weeks, at least, in June will be assigned for Post Obs. task.
 * The site work towards O4 will be rescheduled.

Post Obs. task ([[https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit?usp=sharing|Request]]), Task for O3c ([[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]]).

== Safety ==
== Discussion ==
 * Papers
  * Mechanics of Type-A tower + Cryo-payload: Shoda (on going)
  * Performance of Type-A: Lucia
  * Control of Type-A: Lucia?
  * Control (Sensor correction): Fujii
  * Type-B: Fabian (on going)

 * Personnel towards O4
  * Takahashi supervises both teams.
  * Type-A team: Sato, Miyo, Takahashi, company person
  * Type-B/Bp team: Shoda(supervisor), Hirata, Fabian, Terrence, Washimi, company person

== Travel Plans ==
== Next meeting ==
 * On 2020/6/5(Fri)