= ISC Meeting on 2016/6/13 14:00 - 15:00 =

eZuce: http://srn.ezuce.com/joinSRN?meeting=MvM2Ml2I2BDIDI9I98De9v

Participants: Y. Michimura, K. Arai, E. Hirose, H. Yamamoto, T. Akutsu, K. Kokeyama, Y. Aso

== Minutes ==
 * Members updated: [[KAGRA/Subgroups/MIF/Members|Members]]
 * bKAGRA Phase 1 optical configuration study
  * Motivation for 3-km PRMI?
   * To check RoC and positions of PR mirrors
    * Even if PR2/3 are shifted by 1 cm each
    * Independent measurement of RoC with a mirror alone should be done also
    * '''Check if reference spheres for PR mirrors are available at Caltech  [Hirose] '''
     * It's not easy to measure the RoC since we don't have reference spheres
     * Situation is even worse for IMMT1/2
   * To make 3-km long cavity to do FSS and to attract people
    * '''Check if IMC length stability and others are compatible with 3-km PRMI [Michimura]'''
   * To check thermal state of mirrors
  * Is dummy payload feasible?
   * ETM dummy payload is a single pendulum without any actuators (being prepared by VIS Type-A team)
    * Yaw could be damped with actuators on the last bottom filter, but not pitch
    * ''' Check if dummy payload is quiet enough to make PRMI [Michimura]'''
   * ''' Continue checking dummy ETM availability [Hirose]'''
    * Dummy ETM should be suspended in the way that we can reuse them afterwards
 * bKAGRA Phase 1 initial alignment / commissioning plan
  * Time it takes to check suspension performance not included in the plan
  * Possibility of faster CRYp instead of making dummy payload?
 * bKAGRA Phase 1 analog electronics request for AEL
  * '''Request to AEL [Michimura]'''
  * '''Assign people to modify/produce some of the electronics [Michimura] '''
   * Quad IQ Demodulator heat-up issue
   * Remake IQ Demodulator LSC to ASC for IMC WFS
   * Assemble RF Distribution Amplifier
   * RF Patch Panel modification
 * '''Announce Optickle seminar to broader community [Michimura]'''

== Agenda ==
 * MIF membership [Michimura]
  * members replied: [[KAGRA/Subgroups/MIF/Members|Members]]
 * bKAGRA Phase 1 optical configuration study [Aso]: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=5199|JGW-G1605199]]
  * BS angle changes slightly (0.0187 deg) -> OK
  * beam spot on PR3 shifts by 5 mm -> OK
  * move PR2 and PR3 1 cm each to stabilize PRC -> OK
  * HOM structure / LSC / ASC check -> to be done [Michimura]
    * initiated Optickle 2 modeling: [[https://granite.phys.s.u-tokyo.ac.jp/trac/LCGT/browser/trunk/mif/KAGRAOptickle/bKAGRAPhase1/|KAGRAOptickle SVN]] (login required)
    * Optickle (Optickle2) seminar on July 1 [[http://densuke.biz/list?cd=bNJ9WSPSEQNxheCy|densuke]]
  * room temperature ETM availability -> ? [Hirose]
  * any others?
 * bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=5274|JGW-T1605274]]
  * 4 months (2017.6-9) for 300 K PRMI with dummy payload, 1 week (2018.1) for CRYp PRMI before cooling down
  * seems like we have enough time for ISC (but no margin)
  * everything should be ready by 2017.5, and most of the commissioning should be done by 2017.10
 * bKAGRA Phase 1 analog electronics request for AEL ([[KAGRA/Subgroups/MIF/AEL|Analog Electronics for ISC]]) [Michimura]
  * Quad IQ Demodulator LSC: 7 for full bKAGRA (5 in stock)
   * is heating problem solved? [AEL]
  * Quad IQ Demodulator ASC: 22 for full bKAGRA (0 in stock)
  * RF Distribution Amplifier: 10 for full bKAGRA (1 handmade in stock)
  * DC QPD Interface: 8 (+ AOS) for full bKAGRA (20 in stock) -> OK
  * Frequency Doubler: 2 for full bKAGRA (0 in stock)
  * Common Mode Servo Board?: 4 for full bKAGRA (1 in stock)
   * could be used for FSS using PRCL
   * slow output too noisy, Excitation B OUT 2 is strange, power switch
  * RF Patch Panel modification (too thick to fasten nuts) [Miyo?]
  * RF PD modification (Dsub 9pin won't fix tight, breaks easily with single power supply) [Doi?]
  * single-ended to differential, differential to single-ended: 10 each being prepared by AEL -> OK

-----

 * bKAGRA optical layout around PRC [Aso]
  * POY beam is clipped by PR3 optical bench suspension wire
  * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5261|JGW-T1605261]] (cartoon)
 * iKAGRA post-run calibration mystery [Aso]
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=1767|klog #1767]]
  * mysterious LPF was probably from saturation (is this end of the story?)
  * Miyo-kun did time delay fitting: [[https://nbviewer.jupyter.org/urls/dl.dropbox.com/s/e7tj2xvc8krdo2w/Post-Run%20MICH%20Calibration.ipynb|Jupyter Notebook]], [[https://www.dropbox.com/sh/alk6mothy435dis/AABeRhaV6RRZ1CfUqnq6bc7ua?dl=0|Files in Dropbox]]
 * Requirement for the noise of watchdogs for coil drivers [Aso]
 * Viewport quality for GV between SRM and OMMT [Akutsu]
 * bKAGRA ISC cabling [Michimura/Doi]
  * Doi-san said he will help.
 * Mirror absorption measurement status [Hirose]
 * OMC status [Somiya]
 * Magnetic noise, actuator noise calculation for cryogenic payload [Michimura]
 * Task list update ([[KAGRA/Subgroups/MIF/TaskList|TaskList]]) [Michimura]

== Next meeting ==
2016/6/27 14:00 - 15:00

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