Minute of KAGRA commissioning meeting
- Date: 2019/5/28 15:00~16:00
- Attendance: Miyakawa, Tomura, Fabian, Oshino, Washima, Yokozawa, Nakano, Terrence, Dahan, Kozakai, Pan, Sawada, Nakano, Yamada
- Zoom: Miyoki, Takahashi, Eleonora, Inoue, Fujii
Summary of last week
- Cryo cooler for Yarm stopped and finesse was recovered.
- Xarm 1451(1) with ITMX 73 K ETMX 120 K
- Yarm 1312(5) with ITMY 65 K ETMY 75 K
Discussion
- Results of finesse measurement looks a bit too high. Needs estimation of loss inside cavity for Yarm.
- We should keep finesse measurement for going back the cooling down ITMY.
- For DRMI preparations, optics, circuit, cabling, control models are almost ready.
- Type A control test should be done during DRMI.
- Type B and A needs some IFO as sensor.
- Write manual if you experienced something.
- CAL: MICH and DRMI calibration model is ready.
- Remote work should be managed by calling to control room or sending email to gokagra.
- Smooth transition when watch dog was engaged was implemented to Type B. It should be implemented to Type A. Maybe tomorrow morning during maintenance time or the next week during DRMI.
Others
Discussion
Low finesse issue on Y arm
- Finesse measurement:
- Xarm 1451(1) with ITMX 73 K ETMX 120 K
- Yarm 1312(5) with ITMY 65 K ETMY 75 K
- Cryo status and plan
- ETMs has no dew on 80K viewport but ITMs has still dew on their viewport.
- DRMI
- Engineering run
