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: 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: Members

• bKAGRA Phase 1 optical configuration study [Aso]: 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: KAGRAOptickle SVN (login required)

    • Optickle (Optickle2) seminar on July 1 densuke

  • room temperature ETM availability -> ? [Hirose]

  • any others?

• bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: 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 (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

  • JGW-T1605261 (cartoon)

• iKAGRA post-run calibration mystery [Aso]

  • klog #1767

  • mysterious LPF was probably from saturation (is this end of the story?)

  • Miyo-kun did time delay fitting: Jupyter Notebook, 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 (TaskList) [Michimura]

Next meeting

2016/6/27 14:00 - 15:00

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