= ISC Meeting on 2017/6/19 14:00 - 15:00 =
Participants: Hirose, Aso, Kokeyama, Michimura (eZuce meeting)

=== Next meeting ===
2017/7/3 14:00 - 15:00

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

== Minutes ==
 * Actuator noise modeling [Michimura]
  * Noise from heat links is one of the most interesting issues to be discussed
   * Ask people about the heat link vibration estimation status
 * bKAGRA Phase 1 initial alignment
  * Poke Akutsu for baffle PD　for initial alignment use [Michimura]
 * IR/green steering mirrors
  * No objections for proposed mirror specs

== Agenda ==
 * PSL EOM Layout re-consideration [Enomoto] ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=6748|JGW-T1706748]])
  * Delay-line length decided to be 2.66 m (instead of 8.88 m)
  * Modulation phase between f1 AM and PM is always aligned (we need this to be aligned)
  * Modulation index needed at each EOM is less than measured maximum index by Uehera ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5611|JGW-T1605611]])
  * Optickle simulation by Kohei Yamamoto
   * simulation on imperfections (MZ arm asymmetry, MZ lock, EOM phase difference control etc.)
   * start with hand calculation, simple setups, and then to full IFO simulation
   * meeting with him on June 6.
  * Requirement on carrier power loss?
  * Comment from Stefan Ballmer {*}
   * Similar calculation was done in LIGO in the past. Displacement noise requirement for MZ was tough (~1e-14 m/rtHz).
   * Any in-air interferometer suffer from jitter and frequency noise which cannot be suppressed.

 * OFI and OMC status? [Somiya]
  * look for OFI with larger aperture [Somiya]
  * output optics task sharing status?
  * OMC baseplate issue?
  * design review on June 26 at Titech {*}

 * Actuator noise modeling [Michimura,Miyamoto] ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3453|JGW-T1503453]])
  * Updated magnet size for cryopayload marionette ([[KAGRA/Subgroups/VIS/ActuatorDesign|ActuatorDesign wiki]])
  * Updated lock acquisition section to derive velocity requirements for suspensions (see [[KAGRA/subgroup/ifo/MIF/Minutes20170410|ISC Meeting minutes 20170410]]) [Michimura]
  * Needs to implement frequency noise, but FSS modeling with ALS is complicated [student!]
  * Paper? {*}

 * bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5692|JGW-T1605692]] {*}
  * updated based on current schedule
   * ETMX and ETMY cryopayload installation almost at the same time
   * MICH lock at room temperature before cooling down (instead of cooling down ETMY first)
   * AS cannot be used for room temperature MICH lock (SR3 not ready)
   * SR2 won't be ready by the end of March 2018
  * Fixed mirrors for AS port (including SR2)
  * Some comments from the Chief Meeting
   * Revised schedule seems compatible with PRMI. Why not?
    * PRMI is an option after achieving the Phase 1 goal, if it doesn't delay the final bKAGRA [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5595|JGW-T1605595]]
   * Initial alignment does not interfere with ITM Type-A installation work?
   * Evacuation of IXC/IYC compatible with Type-A installation work?
   * Initial alignment compatible with Pcal setup at EXA/EYA?
    * Meeting with Inoue on June 15 {*}
     * PD at EXA/EYA compatible with Pcal setup
     * Don't we need something like aLIGO baffle PDs for initial alignment after evacuation? Use Tcam (Pcal camera)?

 * IR/green steering mirrors [Michimura] (see [kagra-isc 01649]) {*}
  * for POP/POS and green steering in PR2/SR2 chamber, needs picomotors and ~40 cm pedestals
  * need this by the end of August 2017 (after PR2 installation on June, before IR initial alignment starts on September)
  * proposed mirror specs
   * HR reflectivity: more than 99% for both 1064nm and 532nm
   * AR refectivity: less than 0.3 % for 1064nm, similar for 532nm
   * incient angle: 20-45 deg, s-polarization
   * radius of curvature: flat
   * size: 2-inch
   * wedge: 1 deg
   * substrate: Fused Silica
   * surface quality: λ/20, 0.1 nm rms roughness

See [[KAGRA/subgroup/ifo/MIF/Minutes20170410|this page]] for other agendas.