ISC Meeting on 2016/6/27 14:00 - 15:00

eZuce:

Participants:

Adgenda

• bKAGRA Phase 1 optical configuration study [Michimura]
  • HOM structure / LSC / ASC check [Michimura]

    • initiated Optickle 2 modeling: KAGRAOptickle SVN (login required)

    • Optickle (Optickle2) seminar on July 1 densuke

    • length sensing matrix is OK
  • continue checking dummy ETM availability [Hirose]
  • 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]
  • check if dummy payload is quiet enough to make PRMI [Michimura]

• bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: JGW-T1605274

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

  • request for AEL [Michimura]
  • Quad IQ Demodulator heat-up issue
  • remake IQ Demodulator LSC to ASC temporarily for IMC WFS by 2016.10
    • confirmed with Miyakawa that AEL will take care
  • assemble RF Distribution Amplifier
    • MIF will take care of assembling and purchasing with AEL budget
  • RF Patch Panel modification

• RF generation scheme [Michimura]
  • f1 = 3/8*f2, f3 = 10/8*f2
  • we need 2*f1, 2*f2, f3-f1, f1-f2 as well
  • use harmonics generator (x3, x5, x6, x8, x10, x16 for f2/8 = 5.62698725 MHz)?
  • use multiple signal generators with frequency doubler and differential frequency generator?
• 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]

  • if watchdog resistance noise should be less than DAC noise, dR < 6e-8 Ohm/rtHz (High Power Coil Driver case), dR < 5e-6 Ohm/rtHz (Low Power Coil Driver case), both at 10 Hz

  • too meet actuator noise requirement, dR < 8e-5 Ohm/rtHz (for BS/SRs), dR < 6e-5 Ohm/rtHz (for PRs), both at 10 Hz

  • watchdog resistance fluctuation was measured to be dR < ~1e-6 Ohm (measurement noise limited) (JGW-E1605270)

  • see, also, VISMinutes20160603

• Viewport quality for GV between SRM and OMMT [Akutsu]

• BS baffle could make contract defect? (LIGO-T1000090) [Akutsu,Hiro]

• bKAGRA ISC cabling [Michimura/Doi]
  • Doi-san said he will help.
• Mirror absorption measurement status [Hirose]
• Output optics status [Somiya]

  • suspensions for OMMT1/2 is same as IMMT1/2, ask Takahashi-san to add drivers to his list: JGW-L1605193

  • 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
• Magnetic noise, actuator noise calculation for cryogenic payload [Michimura]

• Task list update (TaskList) [Michimura]

Next meeting

2016/7/11 14:00 - 15:00 (Michimura might be travelling)

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