= ISC Meeting on 2017/6/5 14:00 - 15:00 =
Participants: Aso, Kokeyama, Enomoto, Koji Nagano, Michimura(eZuce meeting)

=== Next meeting ===
2017/6/19 14:00 - 15:00

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

== Minutes ==
 * PSL EOM Layout re-consideration [Enomoto]
  * 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.

 * OFI and OMC status
  * we need design review first!

== 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 was wrong.
  * Relative modulation phase between f1 AM and PM considered.
  * Checked modulation depth availability.
  * Optickle simulation by Kohei Yamamoto?
  * Requirement on carrier power loss?

 * 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]])
  * Needs to implement frequency noise, but FSS modeling with ALS is complicated [student!]
  * Needs to update lock acquisition section (see [[KAGRA/subgroup/ifo/MIF/Minutes20170410|ISC Meeting minutes 20170410]]) [Michimura]

 * RF Doubler Requirement [Michimura]
  * Used for generating 2*f1 and 2*f2 for sideband power monitor
  * Final requirements from ISC are
   * Input Frequency: 16.88 ± 0.1 MHz, 45.02 ± 0.1 MHz (two kinds)
   * Input Level: +10 ± 1 dBm
   * Multiplication Factor: x2
   * Output Frequency: 33.76 ± 2 MHz, 90.03 ± 2 MHz
   * Output Level: +13 ± 2 dBm
   * Harmonics: < -25 dBc (as small as possible)
   * Sub-Harmonics: < -40 dBc (as small as possible)
   * Noise Floor: -170 dBc/Hz (at frequency as low as possible)
  * [[http://www.wenzel.com/model/diode-doubler-lndd/#tabs|Wenzel LNDD]] meets requirement
   * Waiting for more detailed spec sheet [Kamiizumi]

 * OFI and OMC status? [Somiya]
  * look for OFI with larger aperture [Somiya]
  * output optics task sharing status?
  * OMC baseplate issue?

 * bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5692|JGW-T1605692]]
  * needs to be updated based on updated schedule

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