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• Minutes20160112

ISC Meeting on 2016/1/12

14:00 - 15:00 on SeeVogh

Participants: Michimura, H. Yamamoto, K. Arai, Aso, Akutsu

1. Electronics Preparation Status (Michimura, Aso)
   • RFPD/QPD (Aso, Doi): Waiting for delivery
   • RF Distribution Amp assembled by Nakano on Dec 16, 2015

     • http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=4744

   • All the iKAGRA ISC chassis (minimum set) are assembled
2. iKAGRA electronics tasklist
3. RF PD
   • assembly (Aso, Doi)
   • test, tune resonances (?)
4. Cable assembly
   • RF low loss cables with N connectors
     • For short (less than 10m) cables, will not use the semi-rigid low-loss cables. Ask a company to make a bunch of flexible coaxial cables with N connectors (and some long SMA cables).
   • Diff-to-single cables: Only 2 of them are needed. Make them as a part of installation work.
   • we have purchased all the other ISC cables
5. Cabling
   • IMC ASC related (Nakano, U-Toyama students?)
   • REFL related (Michimura, Ando-lab students)
   • IMMT1T(RFPD,DCQPDx2) related (Michimura, Ando-lab students)
   • We have decided not to use IMMT2T in the IOO meeting
6. Magnet noise

   • SmCo 2mm dia, 3mm thick for BS TM is OK

   • magnetic noise from TM: ~1/18 of the displacement noise requirement at 10 Hz
   • DAC output at lock acquisition for TM: ~630 counts

   • SmCo 10mm dia, 10mm thick for BS IM (no change in size)

   • Magnetic noise from IM: ~1/20 of the displacement noise requirement at 10Hz
   • DAC output during lock for IM: ~3425 counts RMS
   • See JGW-T1504450 for the summary of the discussion (includes the discussion for SRs and PRs)

     • http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4450

7. FFT simulation (H. Yamamoto, Hirose)
   • Need transmission data of ETM. What is the status of delivery ?
   • H. Yamamoto will prepare the simulation code so that once the data is available, we can quickly check the requirements on the ITM polishing.
8. Initial Alignment of iKAGRA.
   • How to send the beam to the end at 3km away ?
     • Automatically scan the beam direction using PR3 (for X arm) and check for flashes on the ETM suspension using a video camera.
     • Automation of the above process is an interesting project for students
9. Next meting 2016/1/25