Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2021/6/4 13:00-13:35

Participants: Takahashi, Ikeda, Sato, Hirata, Ushiba, Miyo, Yokozawa, Kimura, Node

Post O3 Upgrade portal

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?
• Disassembly of PRM/PR2 assembly frame: 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?

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)