= Agenda/Minutes of the VIS Meeting on 2020/3/6 =
2020/3/6 14:00 - 16:30

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

Participants: Takahashi, Shoda, Hirata, Sato, Ishizaki, Tanaka, Fujii, Aso, Fabian, Okutomi, Miyo

[[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/9l1h0fw9kc1pzmm/Proocurement%202019FY.xlsx?dl=0|Procurement list in 2019FY]]

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

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

 * ITMX GAS control output accumulated (Reported by Washimi, [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13259|klog#13259]])
  * Even the temperature variation was not so drastic (by less than 1 ℃), the absolute value of the control output reached 20,000 counts.
 * IP control for seismic attenuation (Lucia, Fujii)
  * 0.2 Hz resonant gain implemented but not effective. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13294|klog#13294]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13294|#13357]])
 * ITMY GAS height adjustment for beam position improvement (Nakano, Aso, Lucia, Okutomi)
  * In order to suppress the 1-Hz growing up with the PRFPMI locked, we wanted to lift up the ITMY.
  * ITMY F3 GAS fishing rod brought up the payload by 2 mm, but it was cancelled due to unhealthy oplev sum behavior .([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13304|klog#13304]])
 * ETMX/Y L2Y coupling reduction (Lucia)
  * The coupled yaw motion in the TM oplev was reduced by adjusting the sensing matrix with translating the IP stage in L. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13359|klog#13359]])

==== Plan for coming weeks ====
 * Just curiosity (YF): Do we have any chances to try to implement [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=13335|feed-forwarding at IP-stage]] in the commissioning break?
  * If we have a time period that no one uses the interferometer, maybe I feel I would like to try.


=== Type B ===
==== Past week report ====
 * I uploaded a document in the JGWDoc website describing the intended work for Type-B suspensions in 2020: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11534|JGW-E2011534]]. The motivation was just to have source of clear information of what we have to do. It doesn't have to be limited to Type-B.
 * Limits switches for F0 yaw stepper motor:
  * Last week there was an uncertainty as to how we connected the exisitng F0 yaw stepper motors in SR suspensions; there was a discrepancy between the cabling diagram and what I remembered.
  * We checked the documentation and we remembered Hirata-san improvised 50 cm cable assemblies with 1.5 mm plugs (Burndy) in one end and a male D-sub in the other, then we used a 2.5 m extension cable with female connectors in both ends to reach the flange (Type 2-2.5). Only four threads were connected.
  * For the work this year we will need, for Type-B only, '''4 × 50 cm cable assemblies with eight 1.5 mm plugs (Burndy) in one and a male D-Sub connector in the other'''; additionally, we will require '''1 ''''''× 2.5 m extension cable with female connectors in both ends for the BS''', which doesn't have the yaw stepper motor.
 * Limit switches for SR IPs: it seems all the harware is connected and all we need to do is just to learn how to use them in software; '''is this statement correct?'''
 * What's the status of the oplev boxes?
 * Was there a problem with SR2 real-time model? I heard in the morning briefing today this was solved by Aso-san.

==== Plan for coming weeks ====
=== Type-Bp ===
==== Past week report ====
==== Plan for coming weeks ====
=== OMMT & OSTM ===
==== Past week report ====
==== Plan for coming weeks ====
=== VIS electronics ===
==== Past week report ====
 * Summarized the past measurements and simulations.
==== Plan for coming weeks ====
 * A disconnection around the AD630 was found. Measure the TF with collect connection.
== Safety ==
== Discussion ==
 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11533|Status of ACC development (Takahashi)]]
  * just curiosity (YF): Should we calculate the required sensor noise level beforehand for the purpose of blending?
  * (YF): Do we have any plan to update the seismic spectra at the site?
  * (KM): [[https://github.com/MiyoKouseki/kagra-gif/issues/108|Seasonal Change Spectrum]] or [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9468|klog9468]]

== Travel Plans ==
 * Travel (Week of 3/9):
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Fujii:
  * Tanaka:

 * Travel (Week of 3/16):
  * Takahashi: 16-18
  * Sato:
  * Hirata:
  * Shoda:
  * Fujii:
  * Tanaka:

== Next meeting ==
On 2020/3/13(Fri)