2019/5/21 15:00-16:00 Weekly commissioning meeting topics
Zoom URL: https://zoom.us/j/6676627462
- Assignment of staffs
Schedule
5/14: RT PC maintenance -> go to safe mode for all VIS connected Dolphin (BS, )
- 5/17~ increasing ETMY temperature.
- 5/20-24: Exchanging cryo valves.
- Xend
5/2: Cooling start
- 5/29: Cooling done
- End of April~: Y arm commissioning
- ~End of May: Y arm and FPMI commissioning
Discussion
Low finesse issue on Y arm
- Status as of now
- 2019/5/17(Thu)
- X-arm:
- Finesse = 1399
- Power build-up factor = 891
- Ring-down half-life = 3.11msec
- REFL POWER locked/unlocked = 0.96
- Y-arm:
- Finesse = 28
- Power build-up factor = 18
- Ring-down half-life = 0.42msec
- REFL POWER locked/unlocked = 0.50 (agrees with experiment)
- X-arm:
- 2019/5/17(Thu)
- Finesse of Yarm for green: 17 (design 50)
- 2019/5/17(Fri)
- Finesse of Yarm for IR: 120, ETMY temperature 33K
- 2019/5/19(Sun)
- Finesse of Yarm for IR: 146, ITMY temperature 25K, ETMY temperature 51K
- 2019/5/20(Mon)
- Finesse of Yarm for IR: 131, ITMY temperature 25K, ETMY temperature 60K
- Finesse of Xarm for IR: 1151(probably due to the miscentering), ITMY temperature 29K, ETMY temperature 126K, but alignment at ETMX
- 2019/5/17(Thu)
- Cryo status and plan
- ETMY
- 5/17~: tuned off ETMY cryostat cooler
- 5/24PM~ inject 100Pa Nitrogen to increase temperature. It takes several days close to room temperature ?? degree.
- 5/27 evacuation of Nitrogen.
- ITMY
- 5/23AM~: tuned off cryostat cooler, finesse measurement for Yarm
- ITMX
- 5/22AM~: tuned off cryostat cooler, finesse measurement for Xarm
- ETMY
- Chance for Y arm finesse measurement: 5/21, 5/23
- Searching good spot on Yarm