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= ISC Meeting on 2016/8/8 14:00 - 15:00 =
eZuce:
= ISC Meeting on 2016/8/22 14:00 - 15:00 =
Participants: Michimura, Aso, Enomoto, Arai, Kambara, Moriwaki, Akutsu, Hirose, (Kawamura)
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Participants: === Next meeting ===
2016/9/5 14:00 - 15:00
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 * bKAGRA Phase 1 HOM structure / ASC [Enomoto] ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5362|JGW-T1605362]])
  * decided to move PR2/3 by 1.20 cm -> confirm with Shoda-san again [Michimura]
  * even if we move by 1.20 cm, PRMI is still unstable in worst RoC error case
  * effect on WFS from RF HOMs should be [who?]
  * feedback topology and noise study should be done [Enomoto?]
 * bKAGRA Phase 1 TMS/mode measurement [Enomoto]
  * by measuring the beam radius at ETM, g-factor can be measured within precision of ~0.09; not enough
  * more precise measurement can be done using transfer function measurement with injected sidebands trough IMC (see [[https://dcc.ligo.org/LIGO-G080467|LIGO-G080467]])
   * consider using this technique
  * it takes only few minutes to adjust PR2-3 length (even in vacuum) [Aso] -> confirm with Shoda again [Michimura]
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 * Noise``Budget for Arm Length Stabilization [Kambara] ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5485|JGW-L1605485]])
  * results agreed with Tatsumi Simulink model
  * include fiber noise (fiber setup is different from Tatsumi model)
  * include phase noise from mirror vibration for IR beat setup (it is one of the limiting noise source for aLIGO)
  * schedule and plan for the procurement of circuits (by UToyama or AEL?) should be fixed soon
 * bKAGRA Phase 1 analog electronics [Michimura]
  * MIF agreed on recent electronics request to AEL
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 * IMC sideband frequency [Michimura]
  * f2/8*2.45 = 13.78 MHz plan was explained briefly
  * we will decide on the next meeting
 * Output Optics Table [Michimura]
  * MIF group agreed to move this task from IOO to MIF
   * needs agreement from IOO group and then from SEO
  * safety issue on 2 W beam exposure in air should be discussed

 * RF generation scheme [Michimura]
  * IMC sideband frequency ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5493|JGW-T1605493]])
   * MIF agreed to use f2/8*2.45 = 13.78 MHz for IMC sideband
   * needs agreement from IOO group also
  * may be IMC sideband (and ALS sidebands) should also needs to be phase locked with f1/f2/f3 to avoid "whistling noise"
   * it could be easily done with N5181A, but maybe not with VCXO(OCXO?) to be used in the future

 * Noise``Budget for green lock [Kambara]
  * fiber noise was added (see [[https://dcc.ligo.org/LIGO-T0900376|LIGO-T0900376]])
  * Prometheus laser noise was updated to use spec from Coherent
   * real SHG noise is not available yet -> ask Kawabe/Izumi [Kambara]

 * Updates from MIR group [Hirose]
  * availability on reference spheres for PR mirrors will be checked this week at Caltech
  * AR aperture is 204 mm dia for sapphire mirror
   * this size is tolerable considering 35.3 mm beam radius on ITM/ETM and 2.7 sigma (1 ppm loss)
   * aperture of recoil mass should also be checked [Michiura->Tomaru]
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   * we found mistake in the HOM structure check code
    * PR2-PR3 length re-calculation ongoing
    * we can move PR2/3 by 1.20 cm at max [Shoda,ATC]
   * Comments
    * Feedback topology. Change which mirror to feedback depending on the frequency?
    * Using DC signals for TMs may not be good from the view point of noise.
    * How to measure the precise distance between PR2-PR3?
    * How to de-couple the distance error and ROC errors?
   * decided to move PR2/3 by 1.20 cm -> confirm with Shoda again [Michimura]
    * Shoda said 1.20 cm is OK
    * Now the question is how long does it take to adjust it again -> asking Shoda
   * even if we move by 1.20 cm, PRMI is still unstable in worst RoC error case
   * effect on WFS from RF HOMs should be [who?]
   * feedback topology and noise study should be done [Enomoto?]
   * how to measure the g-factor? PRMI cavity scan possible?
   * need to make beam profiling plan [Enomoto]
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  * discussed at Extended Chief Meeting on July 4 ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5352|JGW-G1605352]])
 
* beam profiling plan should be compatible with vacuum plan; MIF will lead the planning
   * how to extract AS beam should be fixed by MIF
  * CRYp agreed on installing ETMY earlier by two months (ETMY CRYp: 2017.8-9, ETMX CRYp: 2017.12-2018.1)
    * use 2017.10-11 to test PR-ETMY and ETMY cooling
     * '''negotiate with CRYp to fix ETMY cooling schedule'''
  * beam profiling plan should be compatible with vacuum plan; MIF will lead the planning
   * not only PR2-PR3 but also IMMT1-IMMT2
  *
how to extract AS beam should be fixed by MIF
  * CRYp agreed on installing ETMY earlier by two months (ETMY CRYp: 2017.8-9, ETMX CRYp: 2017.12-2018.1)
   * use 2017.10-11 to test PR-ETMY and ETMY cooling
    * '''negotiate with CRYp to fix ETMY cooling schedule'''
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   * '''where did front/rear panels go?'''    * '''where did front/rear panels go?''' -> look for them on Aug 24 [Nakano]
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   * outsource?    * one by one by hand is tough; outsource?
  * Requested to AEL; meeting with Miyakawa on Aug 24 [Michimura]
   * Quad IQ Demodulator LSC [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5487|JGW-T1605487]]
   * Quad IQ Demodulator ASC [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5488|JGW-T1605488]]
   * High Power Coil Driver [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5489|JGW-T1605489]]
   * RF Distribution Amplifier [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5490|JGW-T1605490]]
   * Common Mode Servo Board [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5491|JGW-T1605491]]
   * Frequency Doubler [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5492|JGW-T1605492]]

 * Output optical tables [Michimura] ([[KAGRA/Subgroups/IOO/OutputTables|OutputTables wiki]])
  * '''Kawamura suggested to move this task from IOO to MIF'''
  * Is it acceptable?
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   * f2/8*2.45 = 13.78 MHz for IMC anti-resonance?    * f2/8*2.45 = 13.78 MHz for IMC anti-resonance? ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5493|JGW-T1605493]])
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  * ALS Meeting on July 27 ([[KAGRA/subgroup/ifo/MIF/Minutes20160727|Minutes page]])
  * agreed that the default plan is to use Tatsumi et al. configuration and to put AUX lasers at PSL table in the clean booth
  * noise study [Kambara](boot camp on August 1-5 at Hongo)
   * started with reproducing Tatsumi model ([[https://granite.phys.s.u-tokyo.ac.jp/trac/LCGT/browser/trunk/kagranoisebudget/GreenLock|GreenLock NoiseBudget SVN]])
   * Tasumi Simulink model and Kambara Noise``Budget model basically agreed ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5485|JGW-L1605485]])
  * Noise``Budget [Kambara]
   * results agreed with Tatsumi Simulink model
   * include fiber noise (fiber setup is different from Tatsumi model)
   * include phase noise from mirror vibration for IR beat setup (it is one of the limiting noise source for aLIGO)
   * schedule and plan for the procurement of circuits should be fixed soon
    * keep in touch with AEL group
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  * Doi-san said he will help.   * need to announce to IOO,ISC mailing list; e-mailed to Doi-san for go sign
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== Next meeting ==
2016/8/22 14:00 - 15:00

ISC Meeting on 2016/8/22 14:00 - 15:00

Participants: Michimura, Aso, Enomoto, Arai, Kambara, Moriwaki, Akutsu, Hirose, (Kawamura)

Next meeting

2016/9/5 14:00 - 15:00

back to Meetings page

Minutes

  • bKAGRA Phase 1 TMS/mode measurement [Enomoto]
    • by measuring the beam radius at ETM, g-factor can be measured within precision of ~0.09; not enough
    • more precise measurement can be done using transfer function measurement with injected sidebands trough IMC (see LIGO-G080467)

      • consider using this technique
    • it takes only few minutes to adjust PR2-3 length (even in vacuum) [Aso] -> confirm with Shoda again [Michimura]

  • bKAGRA Phase 1 analog electronics [Michimura]
    • MIF agreed on recent electronics request to AEL
  • Output Optics Table [Michimura]
    • MIF group agreed to move this task from IOO to MIF
      • needs agreement from IOO group and then from SEO
    • safety issue on 2 W beam exposure in air should be discussed
  • RF generation scheme [Michimura]
    • IMC sideband frequency (JGW-T1605493)

      • MIF agreed to use f2/8*2.45 = 13.78 MHz for IMC sideband
      • needs agreement from IOO group also
    • may be IMC sideband (and ALS sidebands) should also needs to be phase locked with f1/f2/f3 to avoid "whistling noise"
      • it could be easily done with N5181A, but maybe not with VCXO(OCXO?) to be used in the future
  • NoiseBudget for green lock [Kambara]

    • fiber noise was added (see LIGO-T0900376)

    • Prometheus laser noise was updated to use spec from Coherent
      • real SHG noise is not available yet -> ask Kawabe/Izumi [Kambara]

  • Updates from MIR group [Hirose]
    • availability on reference spheres for PR mirrors will be checked this week at Caltech
    • AR aperture is 204 mm dia for sapphire mirror
      • this size is tolerable considering 35.3 mm beam radius on ITM/ETM and 2.7 sigma (1 ppm loss)
      • aperture of recoil mass should also be checked [Michiura->Tomaru]

Agenda

  • bKAGRA Phase 1 optical configuration study [Michimura]
    • HOM structure / ASC check [Enomoto] (JGW-T1605362)

      • decided to move PR2/3 by 1.20 cm -> confirm with Shoda again [Michimura]

        • Shoda said 1.20 cm is OK
        • Now the question is how long does it take to adjust it again -> asking Shoda

      • even if we move by 1.20 cm, PRMI is still unstable in worst RoC error case
      • effect on WFS from RF HOMs should be [who?]
      • feedback topology and noise study should be done [Enomoto?]
      • how to measure the g-factor? PRMI cavity scan possible?
      • need to make beam profiling plan [Enomoto]
    • check if reference spheres for PR mirrors are available at Caltech [Hirose]
    • check if IMC length stability and others are compatible with 3-km PRMI [Michimura]
  • bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: JGW-T1605274

    • beam profiling plan should be compatible with vacuum plan; MIF will lead the planning
      • not only PR2-PR3 but also IMMT1-IMMT2
    • how to extract AS beam should be fixed by MIF
    • CRYp agreed on installing ETMY earlier by two months (ETMY CRYp: 2017.8-9, ETMX CRYp: 2017.12-2018.1)
      • use 2017.10-11 to test PR-ETMY and ETMY cooling
        • negotiate with CRYp to fix ETMY cooling schedule

  • bKAGRA Phase 1 analog electronics (Analog Electronics for ISC) [Michimura]

    • Quad IQ Demodulator heat-up issue
      • 1st stage amp is heating up
      • we have to decide if we need 1st stage amp or not

    • remake of Quad IQ Demodulator LSC to ASC [Michimura->Niigata students?; by 2016.10]

      • MIF will take care istead of AEL
      • mass production will be taken care by AEL
      • 4-way splitter (Mini-Circuits ZFSC-4-1-S+) arrived at Kamioka -> Mozumi office loft

    • RF Distribution Amplifier [Michimura->Niigata students?; by 2016.10]

      • we will omit RF monitor for now, and add them later
      • where did front/rear panels go? -> look for them on Aug 24 [Nakano]

      • ordered RF amp (Wenzel LNBA-11-23-CK-100-15)
      • 8-way splitter (Mini-Circuits ZCSC-8-1+), coupler (Mini-Circuits ZX30-20-4) arrived at Kamioka -> Mozumi office loft

      • basically copy of LIGO-D1000124, but we will omit Interface for the first stage

      • ask LIGO people for necessity of RF monitor [Michimura]
        • RF monitor was used in aLIGO for noise hunting and IFO health check (input from Izumi)
      • we have to request AEL to make interface board

    • RF Patch Panel modification [Michimura->Niigata students?]

      • one by one by hand is tough; outsource?
    • Requested to AEL; meeting with Miyakawa on Aug 24 [Michimura]
  • Output optical tables [Michimura] (OutputTables wiki)

    • Kawamura suggested to move this task from IOO to MIF

    • Is it acceptable?
  • RF generation scheme [Michimura]
    • f1 = 3/8*f2, f3 = 10/8*f2
    • we need 2*f1, 2*f2, f3-f1, f3-f2 as well
    • use harmonics generator (x2, x3, x6, x8, x10, x16 for f2/8 = 5.62698725 MHz (FSR for IMC))
      • seeking for vendors
    • sideband frequency for IMC? (should be determined before EOM production; by the end of 2016.8)

      • f2/8*2.45 = 13.78 MHz for IMC anti-resonance? (JGW-T1605493)

  • Arm Length Stabilization plan (JGW-T1605353)

    • NoiseBudget [Kambara]

      • results agreed with Tatsumi Simulink model
      • include fiber noise (fiber setup is different from Tatsumi model)
      • include phase noise from mirror vibration for IR beat setup (it is one of the limiting noise source for aLIGO)
      • schedule and plan for the procurement of circuits should be fixed soon
        • keep in touch with AEL group


  • bKAGRA optical layout around PRC
    • POY clipping issue will be solved by modifying PR3 optical bench suspension [Shoda]
    • we need layout CAD for POY pickoff mirror, POP pickoff mirror to design baffles
      • possibility of buying baffles next FY? -> ask SEO [Aso]

      • ask SEO to hire a person dedicated for optical CAD
      • layout CAD will be prepared by each subgroup for the time being
  • iKAGRA post-run calibration mystery [Aso]
    • mysterious LPF was from saturation
    • write an elog about this conclusion [Aso]

  • Requirement for the noise of watchdogs for coil drivers [Aso]
    • recent result show dR < 1e-7 Ohm/rtHz, so it may meet the requirement

    • slow (~20 min) drift at dR ~ 5e-4 Ohm -> this should be negligible

  • Viewport quality for GV between SRM and OMMT [Akutsu]
    • aLIGO case: SRM-OFI-viewport, KAGRA case: SRM-viewport-OMMT-OFI
    • aLIGO viewport is always closed
    • if we need super quality viewport, we have to decide soon

  • BS baffle could make contract defect? (LIGO-T1000090)

    • ask Akutsu and Hiro
    • BS has 370 mm dia and beam at BS is 2*36 mm dia. So, it should be in principle OK. But recoil mass aperture should be considered.
  • bKAGRA ISC cabling [Michimura/Doi]
    • need to announce to IOO,ISC mailing list; e-mailed to Doi-san for go sign
  • Mirror absorption measurement status [Hirose]
  • Output optics status [Somiya]
    • suspensions for OMMT1/2 is same as IMMT1/2 (driver list for now: JGW-L1605334)

    • we have to make vacuum compatible PD/QPD for OMC by 2018.3
    • beam shutter: prototype done, AR coating and driver circuit design not yet
    • OMC suspension requirement cross check [Somiya]

  • Magnetic noise, actuator noise calculation for cryogenic payload [Michimura]
    • Ask Tomaru about the parameters and actuator design, range

  • Task list update (TaskList) [Michimura]

KAGRA/subgroup/ifo/MIF/Minutes20160822 (last edited 2016-08-22 16:55:11 by YutaMichimura)