Differences between revisions 15 and 16
Revision 15 as of 2021-06-04 14:36:47
Size: 5371
Comment:
Revision 16 as of 2021-06-11 12:28:31
Size: 5424
Comment:
Deletions are marked like this. Additions are marked like this.
Line 30: Line 30:
 * Disassembly of PRM/PR2 assembly frame: Schedule?

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)

KAGRA/Subgroups/VIS/VISMinutes20210604 (last edited 2021-06-11 12:29:28 by RyutaroTakahashi)