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| * Modulation index needed at each EOM is less than measured maximum index by Uehera | * Modulation index needed at each EOM is less than measured maximum index by Uehera ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5611|JGW-T1605611]]) |
ISC Meeting on 2017/6/5 14:00 - 15:00
Participants: Aso, Kokeyama, Enomoto, Koji Nagano, Michimura(eZuce meeting)
Next meeting
2017/6/19 14:00 - 15:00
Minutes
- PSL EOM Layout re-consideration [Enomoto]
- Delay-line length decided to be 2.66 m (instead of 8.88 m)
- Modulation phase between f1 AM and PM is always aligned (we need this to be aligned)
Modulation index needed at each EOM is less than measured maximum index by Uehera (JGW-T1605611)
- Optickle simulation by Kohei Yamamoto?
- simulation on imperfections (MZ arm asymmetry, MZ lock, EOM phase difference control etc.)
- start with hand calculation, simple setups, and then to full IFO simulation
- OFI and OMC status
- we need design review first!
Agenda
PSL EOM Layout re-consideration [Enomoto] (JGW-T1706748)
- Delay-line length was wrong.
- Relative modulation phase between f1 AM and PM considered.
- Checked modulation depth availability.
- Optickle simulation by Kohei Yamamoto?
- Requirement on carrier power loss?
Actuator noise modeling [Michimura,Miyamoto] (JGW-T1503453)
Updated magnet size for cryopayload marionette (ActuatorDesign wiki)
- Needs to implement frequency noise, but FSS modeling with ALS is complicated [student!]
Needs to update lock acquisition section (see ISC Meeting minutes 20170410) [Michimura]
- RF Doubler Requirement [Michimura]
- Used for generating 2*f1 and 2*f2 for sideband power monitor
- Final requirements from ISC are
- Input Frequency: 16.88 ± 0.1 MHz, 45.02 ± 0.1 MHz (two kinds)
- Input Level: +10 ± 1 dBm
- Multiplication Factor: x2
- Output Frequency: 33.76 ± 2 MHz, 90.03 ± 2 MHz
- Output Level: +13 ± 2 dBm
Harmonics: < -25 dBc (as small as possible)
Sub-Harmonics: < -40 dBc (as small as possible)
- Noise Floor: -170 dBc/Hz (at frequency as low as possible)
Wenzel LNDD meets requirement
- Waiting for more detailed spec sheet [Kamiizumi]
- OFI and OMC status? [Somiya]
- look for OFI with larger aperture [Somiya]
- output optics task sharing status?
- OMC baseplate issue?
bKAGRA Phase 1 initial alignment / commissioning plan [Michimura]: JGW-T1605595
- needs to be updated based on updated schedule
See this page for other agendas.