ISC Meeting on 2016/7/25 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
- Enomoto, Nagano (ICRR), Komori, Aritomi, Shimoda (UT), Kasuya (Titech), Kagawa, Chen, Kumagaya, Sugawara (Niigata) attended
- length sensing matrix is OK
- ASC check [Enomoto]
- continue checking dummy ETM availability [Hirose]
- cost estimate arrived
- 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]
- HOM structure / LSC / ASC check [Michimura]
bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: JGW-T1605274
- discussed at Extended Chief Meeting on July 4
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?]
- MIF will take care istead of AEL
- mass production will be taken care by AEL
- ordered 4-way splitter (Mini-Circuits ZFSC-4-1-S+) to M-RF [Michimura]
RF Distribution Amplifier [Michimura->Niigata students?]
- we will omit RF monitor for now, and add them later
- in the process of ordering RF amp (Wenzel LNBA-11-23-CK-100-15)
- ordered 8-way splitter (Mini-Circuits ZCSC-8-1+), coupler (Mini-Circuits ZX30-20-4) to M-RF [Michimura]
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?]
- Quad IQ Demodulator heat-up issue
- 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)
- seeking for vendors
- 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) [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]
Ask Tomaru about the parameters and actuator design, range
Task list update (TaskList) [Michimura]
Next meeting
2016/8/8 14:00 - 15:00