= Agenda/Minutes of the VIS Meeting on 2020/5/15 =
2020/5/15 14:00 - 14:40

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

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

[[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 ===
 * Monitoring the status.
 * Started the paper project on Type-A mechanics.
 * Integrated ３D model of each Type-A tower.(JGW-D2011655)
  * According to the 3D model, it was found that the placement of the BF Dumper is offset by 5 degrees from the beam line (EX, EY only) [[attachment:ETM BF Dumper.pdf]]

=== Type-B ===
 * Type-B paper: I wrote a [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/TypeB/PaperTODOlist|TO DO list]] which roughtly works as an outline. Thank you Shoda-san for your comments!
  * In case it's not possible to measure the quality factors due to time constraints related to the pandemic, we can cite the prototype paper instead where similar measurements were reported.
  * Include long term drift observation of the optic orientation using the oplev.
  * Check what Terence did about inertial damping. He wrote good klog entries but there's still not enougn information to understand the detail. I will ask him once he becomes avilable to us sometime next month.
 * Inertial damping: I have been checking what Takanori did and I've been trying to adapt it to the case of SR2 using the Matlab simulation. I have questions but I'm not ready to ask. I will do it sometime soon via e-mail.

=== Type-Bp ===
=== Type-C ===
 * Started making 3D model of the present IMMT2 suspension.

=== Controls ===
=== Electronics ===
 * Finished initial design of the additional filter for combiner.
 * Prepare for the test parts and start the experiments.

== 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]]).
 * Papers
  * Type-A: Shoda(Mechanics), Lucia(Performance), Fujii(Sensor collection).
  * Type-B: Fabian

== Safety ==
== Discussion ==
 * We have 15-min. slot on the future plan of VIS in the KAGRA Telecon.
== Travel Plans ==
== Next meeting ==
 * On 2020/5/22(Fri)