Contents
Agenda/Minutes
CRY+VIS Interface Meeting
Date: 2021/6/4 13:00-13:35
Participants: Takahashi, Ikeda, Sato, Hirata, Ushiba, Miyo, Yokozawa, Kimura, Node
Schedule
- IX: H4 geophone should be replaced. To alignment of IFO, it is necessary to enter the cryostat.
- IY: Cryo-payload was installed on 5/31. Cryostat will be closed on 6/7-9. Schedule: Release of cryo-payload was scheduled on 6/10.
- EX: New collimator for Oplev was tested. Schedule: Adjustment of Yaw FR was scheduled on 6/9.
- EY: Installation of tower was almost finished. Cleaning inside the cryostat was finished. Pure water generator was delivered. Handling jig is under manufacturing.
Status
- Corrugate tube fixing jig: Other 3 sets will be ready by the end of June.
- TM height setting: External review?
- Commissioning in air: The first priority is damping of PR3. Making the auto TF measurement.
- Commissioning in vacuum:
- Overall commissioning:
- Acceptance check: Group work is set every Friday. Maintenance day also will be set on Friday.
- PF actuator: After SC.
- Jig for FC painting:
- New rack in 2F: Schedule?
Discussion
VIS Meeting
14:00-14:25
Participants: Takahashi, Miyo, Hirata, Sato, Fabian, Sugiyama, Terrence, Tanaka, Ishizaki
Klog
This is generated by python script in /users/Miyo/dropbox/Script/scrapping/main.py.
Summary Report
Type-A
- Connected the wire for cryo-payload in IY.
- Implemented the limit SWs and F0 FR in IY.
- Assembled the additional geophone pods in IX.
- Implemented the limit SWs and F0 FR in EY.
- Adjusted the tilt and load of IP in EY.
- Calibrated the BF damper in EY.
Type-B
SR2
- In F0 FR, we set the hardware limit switches in suitable positions.
- We changed the F0 keystone heavy top plate for a lighter one because at zero, the FR was almost at its upper limit.
- We adjusted the amount of ballast mass on top of the F0 keystone.
- At the end we got
- Hardware limit switches trigger at: [ -2,072,149 ; 1,018,568 ] steps
- Software limits: [ -2,050,000 ; 1,017,000 ] steps
F0 LVDT: [ -977 , 929 ] µm.
Buoyancy effect is 182 um.
We set the GAS filters in zero and measured the height of the mirror. It is approximately 0.95 mm above the nominal level (Terada-san's mark). This value is consistent with previous measurements. We will lower the pre-isolator by this amount on Monday.
- We measured the position of Tereda-san's mark with respect to the center of the flange: it is off by 1 mm, which is fine given the laser level line thickness.
SR3
We set the F0 FR upper hardware limit switch in place.
Type-Bp
Hirata-san and Yano-san placed alignment beam targets in PR2 and PRM suspensions.
TypeC
- Aligned the IMMT suspensions.
Electronics
Control
Schedule
See Schedule
- Type-A team: IY(Release of cryo-payload), EY(F0/IP tuning), EX(Yaw FR adjustment)
- Type-B team: SR
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
[Terrence]
Suspension commissioning documentation progress (link here):
- Basic method sections (almost finished)
- Sensor noise estimation
- Frequency series modeling (Transfer function and spectrum modeling)
- Sensor and actuation diagonalization (will include examples later)
- Inter-calibration (will include examples later)
- Sensor fusion: complementary filters and sensor correction (In progress)
- Time series simulation of known noise PSD (In progress)
- Control design (In progress)
- More?
- Advanced methods (Will fill those in slowly)
- Mode extraction using dynamic mode decomposition (Very simple algorithm that can extract resonance frequeniessss and damping timessss from a noisy time series)
- Control optimization, filter optimization, optimal control methods, how do we get the best control performance out of our crappy sensors? (My research).
- PReQua.
- More?
- What happened to the meeting?
- Basic method sections (almost finished)
Travel Plans
The week from 6/7
- Takahashi: 6/7-11
- Sato: 6/7-11
- Hirata: 6/7-11
- Yano: 6/7-11
The week from 6/14
- Takahashi: 6/14-18
- Sato: 6/14-18
- Hirata: 6/14-18
- Yano: 6/14-18
Next meeting
- 2021/6/11(FRI)