= ISC Meeting on 2021/06/28 14:00 - 15:00 =
Participants: Keiko Kokeyama, Chiaki Hirose, Kiwamu Izumi, Masayuki Nakano, Ryosuke Sugimoto, Satoshi Tanioka, Yoichi Aso, Tomotada Akutsu, Kenta Tanaka, Shoichi Oshino, Hiroaki Yamamoto, Shinji Miyoki, Osamu Miyakawa, Yuta Michimura

Zoom meeting: https://zoom.us/j/6676627462

Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20210628T0500

=== Next meeting ===
TBD

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

== Minutes ==
 * Phase camera project [Kokeyama]
  * How to get the reference beam?
   * IR fiber is already there at POP/POS (main + spare for green, two for IR; 4 fibers in total for each table)
  * Speed of phase camera?
   * Important if we use the signal for some alignment control etc.
   * At Virgo, it was ~ 1 shot / 1 sec. Daniel Brown et al at Adelaide are making faster ones.
  * Discuss more after result comes out (October-ish)
  * Optical table layout and electronics needs to be checked
   * Maybe we need such device anyway at some point
  * '''DECISION''' KAGRA ISC supports the proposal
 * ALS report [Izumi]
  * Arm locking section of the users manual is not finished.
   * '''A/I''': Talk with Nakano etc. to complete the manual [Izumi]
  * Noise level of PLL control/error signals are somehow breathing
  * '''A/I''': Remind Tanioka about the procurement of items related to alignment [Michimura]
 * IMC ASC report [Kenta, C. Hirose]
  * Control strategy needs to be re-checked.
  * Analytical calculation and FINESSE simulation result do not match completely.
  * '''A/I''': Check the calbiration of A2L coupling factor and the status of coil balancing.
 * IMMT1T ISS POM [Michimura]
  * There is another uncertainty on the loss introduced at the viewports (AR specified only at 0 deg incidence).
  * '''DECISION''' We will go for 90:10.


== Agenda ==
 * IMC ASC [Kenta, C. Hirose, 20 min] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=13047　[[attachment:ISCmeeting_0628_hirose.pdf]]
 * Phase camera project [Kokeyama, 10 min] [[attachment:isc0628_kk.pdf|slide]]
 * ALS report [Izumi, 10 min]
  * ALS users manual https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=13031
  * Remaining tasks for ALS https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=13042
 * IMMT1T ISS POM spec (see below) [Michimura, 10 min]


 * [[KAGRA/Subgroups/MIF/O4CommissioningTaskList|O4 commissioning task list]] [Izumi, Michimura]
  * Any missing items?
 * Other reports
  * Non-polarizing beam splitters for in-air optical tables ordered https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12956 [Michimura]
  * In-vac steering mirrors: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12592 [Michimura]
   * IMMT1T ISS POM: Spec to be finalized
    * R:T=90:10 for 1064 nm, transmissive for oplev beam (663-675nm) https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12949
     * 0.2963% @ 1064 nm measured by the vendor. 0.22% measured by Akutsu-san at the site.
     * Need to check again if ISS people is happy about R=90%
    * Wedge finalized to be 1 deg (wedge side is HR)
   * All reflective steering mirrors: Spec to be finalized
    * Order AoI=0-30 deg ones and AoI=30-50 ones
    * Wedge finalized to be 0.5 deg
  * Optical table cover [Michimura]
   * IMC TRANS assembled, IMC REFL delivered
   * Parts for fixing FFU on REFL, POP, AS ordered
   * TRX and TRY ordered
   * Additional small FFU for POS ordered