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| * delay-line length decided to be 2.66 m (instead of 8.88 m) | * 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) |
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| * simulation on imperfections (MZ arm asymmetry, MZ lock, EOM phase difference control etc.) |
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
- 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.