Contents
Agenda/Minutes
CRY+VIS Interface Meeting
Date: 2021/6/25 13:00-
Participants:
Schedule
- IX: TF measurement of MN is on going.
- IY: Rough alignment of TM was tried. The ballast weight on the PF is too small to take a ballance. Additional spring on the BF is necessary.
- EX: Alignment for the green beam. The week of 7/5?
- EY: Mirror cleaning in Mitaka is on going.
Status
- Corrugate tube fixing jig: Delivery and implement are scheduled on 7/12-13.
- TM height setting: Next target is ITMY.
- Commissioning in air: X-arm.
- Commissioning in vacuum:
- Overall commissioning:
- Acceptance check: Group work is set every Friday.
- PF actuator: After SC.
- Jig for FC painting:
- Separation of rack in 2F: On the maintenance days in July.
- Disassembly of PRM/PR2 assembly frame: This is scheduled on 6/28-29.
Discussion
VIS Meeting
14:00-
Participants:
Klog
This is generated by python script in /users/Miyo/dropbox/Script/scrapping/main.py.
Summary Report
Type-A
Type-B
I wrote the Type-B section of the O3GK paper.
BS
- With Takahashi-san we moved the ballast masses on the IP to have a more uniform distribution with the hope of reducing the asymmetry in the IP-L and IP-T resonance frequencies. It did not work. On the contrary, the difference increased: it went from 24 to about 30 mHz.
- Then we added 4.7 kg and the frequencies went down to 63 and 92 mHz.
- The temperature was 23.8 degrees, which is high. The frequencies will decrease when it becomes 23 degrees again.
- L and T look strongly coupled. Maybe similar to what Terrence observed in SRM.
SR2
We measured the IP transfer functions. The resonance frequencies in L and T are both close to 70 mHz. They cannot be distinguished from each other but they below 80 mHz.
SR3
- The IP resonance frequencies in L and T had an asymmetry of about 23 mHz and one of them was very low: 70 and 47 mHz in L and T respectively.
- We removed 1.1 kg and redristributed 3.8 kg: the frequencies became 78 and 55 mHz.
- Later we removed 1.2 kg and they changed to 83 and 63 mHz.
- We were not able to remove the asymmetry.
Remaining tasks
- Install the supporting beams of the BS outer frame.
- In BS, SR2 and SR3 lock the IP and F0 to measure noise.
- Measure parameters for the acceptance check.
Type-Bp
- The green laser reflected by SR3 reached the X End.
- No major ajustments to the payload were necessary.
- It only required adjustment in yaw, which was done with the BF Damper first and later offloaded to the traverser.
- This likely means we left the payload in good condition.
Type-C
Electronics
Control
Schedule
See Schedule
- Type-A team: Adjustement of IYV
- Type-B team: Remaining work
Milestone
IMC suspensions are ready in air [40] will finish 2021/04/21.
PRs are ready in air [643] will finish 2021/07/09.
ETMX is ready in air [656] will finish 2021/08/25.
ITMX is ready in air [657] will finish 2021/08/31.
ETMY is ready in air [658] will finish 2021/09/16.
ITMY is ready in air [659] will finish 2021/11/08.
BS is ready in air [691] will finish 2021/11/24.
SRs are ready in air [663] will finish 2021/12/20.
Output suspensions are ready in air [695] will finish 2021/12/21.
TMSY is ready in air [708] will finish 2021/??/??.
TMSX is ready in air [684] will finish 2021/??/??.
2021/03/29 updated
Safety
Discussion
Travel Plans
The week from 6/28
- Takahashi: 6/28-7/2
- Sato: 6/28-7/2
- Hirata: 6/28-7/2
- Yano: 6/28-7/2
The week from 7/5
- Takahashi: 7/5-9 (KIW8 7/7-9)
- Sato: 7/5-9
- Hirata: 7/5-9
- Yano: 7/5-9
Next meeting
- 2021/7/2(FRI)