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

back to Meetings page