= ISC Meeting for ASC Strategies 2021/08/16 13:00 - 15:00 =
Participants: Shinji Miyoki, Naoki Koyama, Osamu Miyakawa, Terrence Tak Lun Tsang, Yoichi Aso, Tatsuki Washimi, Chiaki Hirose, Takafumi Ushiba, Kenta Tanaka, Marc Eisenmann, Hirotaka Yuzurihara, Yuta Michimura

Zoom meeting: https://zoom.us/j/5045179604

Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20210816T0400

=== Next meeting ===
TBD

[[LCGT/subgroup/ifo/ISC/Meetings|back to Meetings page]]

== Minutes ==
 * Possibility of shortening Xarm and Yarm commissioning
  * We decided to show the shortened version of the schedule and task list, and ask for suggestions.
  * Shortened task list
   * POP investigation, REFL WFS and POP WFS consistency check, arm cavity alignment to check mid-size baffle positions
   * Other tasks are postponed to FPMI commissioning in-vac
  * Things to ask for suggestions
   * Target values for mode matching and laser power throughput
   * Whether if we should adjust PR2 and PR3 to improve the mode matching in air
 * Requirements for local damping
  * We need to check the status of coil drivers actually installed. For most of the suspensions, high power ones are currently used and this eases the requirement.
  * Nakano-kun said PRs are important for achieving the lock, but 7.3 um/sec requirement seems to be easily achievable. We need to check the current values.
  * For Type-A suspensions, <240 um/sec is the requirement for arm green locking, but there is another requirement coming from the central part locking. ITMs needs to be settled down to a level comparable to BS, SRs and PRs to lock recycling cavities (See text right below Table 5.1 in Sekiguchi thesis).
  * Let's set the requirement to be <0.44 um/sec for central part locking
 * What we want to ask the reviewers?
  * Send Michimura an email if you have some suggestions.

== Agenda ==
 * External review next week! August 24, 2021 22:00-0:00 (JST)
 * Requirements for local damping summarized
  * ITMs and ETMs (Type-A): <240 um/sec, <0.1 urad RMS
  * BS (Type-B): <1.6 um/sec, <1 urad RMS
  * SRs (Type-B): <0.44 um/sec, <1 urad RMS
  * PRs (Type-Bp): <7.3 um/sec, <1 urad RMS
  * References:
   * K. Okutomi PhD thesis (Table 3.5) [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=9347|JGW-P1809347]]
   * T. Sekiguchi PhD thesis (Table 5.2) [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=4155|JGW-P1504155]]
   * Y. Michimura et al (Section 6) [[https://doi.org/10.1088/1361-6382/aa90e3|Classical and Quantum Gravity 34, 225001 (2017)]]
 * Possibility of shortening Xarm and Yarm commissioning?
  * http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/MIF/ExternalReview2021#agenda2
  * Latest schedule: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9209
  * Strategy for the arm cavity commissioning while the central area is open
   * Should we adjust the position of the PR2 and PR3 to improve the mode matching to the arms at Xarm/Yarm commissioning periods? Or after the center area is evacuated?
 * What we want to ask the reviewers?
 * IMC ASC report? (Kenta, Chiaki)
  * To be discussed at the IMC ASC weekly on Wednesday