Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2021/5/21 13:00-

Participants:

Post O3 Upgrade portal

Schedule

• IX: Yaw FR was adjusted and the chamber was closed on 5/17-18.
• IY: Acceptance review is scheduled on 5/21. Remedy of the pre-isolator is postponed.
• EX: Parts to modify the addtional FR will be delivered on 5/24.
• EY: Installation of the tower is on going. Items (pure water maker, etc.) for the mirror cleaning are under preparation.

Status

• Corrugate tube fixing jig: Other 3 sets will be ready by the end of June.
• TM height setting: Height standard around the cross tube was made in IX/IY.
• Commissioning in air: Started on the pre-isolator in IX.
• Commissioning in vacuum:
• Overall commissioning:
• Acceptance check: Group work is set every Friday to make the acceptance check document.
• PF actuator: After SC.
• Jig for FC painting: Tested in this week.

Discussion

VIS Meeting

14:00-

Participants:

Schedule

See Schedule

• Type-A team: IXV 5/24, EXV 2/25, EYV 5/24-28
• Type-B team:

Milestone

• IMC suspensions are ready in air [40] will finish 2011/04/21.

• PRs are ready in air [643] will finish 2011/07/09.

• 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 2011/11/24.

• SRs are ready in air [663] will finish 2011/12/20.

• Output suspensions are ready in air [695] will finish 2011/12/21.

• TMSY is ready in air [708] will finish 2011/??/??.

• TMSX is ready in air [684] will finish 2011/??/??.

2021/03/29 updated

Klog

EX

• 16535 Height adjustment of ETMX , ryutaro.takahashi

General

• 16506 Deleted unnecessary processes from VIS model file. , satoru.ikeda

IX

• 16421 Height adjustment of ITMX , ryutaro.takahashi

  • 16499 Comment , ryutaro.takahashi

  • 16519 Comment , ryutaro.takahashi

MCE

• 16512 MCe oplev characterization , takaaki.yokozawa

  • 16525 Comment , takaaki.yokozawa

  • 16522 Comment , tomotada.akutsu

MCF

• 16498 Type-C simulation model , yoichi.aso

• 16501 Oplev calibration MCo , takaaki.yokozawa

• 16500 Characterization of optical lever MCi , takaaki.yokozawa

• 16537 MCo suspension strange , tomotada.akutsu

• 16157 Investigation of IMC suspensions , ryutaro.takahashi

  • 16513 Comment , kouseki.miyo

PR3

• 16520 Thermistor installation , fabian.arellano

• 16521 Setting the mirror to nominal height , fabian.arellano

• 16348 Tightening the locating clamps for the piano wire. , fabian.arellano

  • 16502 Comment , fabian.arellano

• 16520 Thermistor installation , fabian.arellano

  • 16533 Comment , fabian.arellano

• 16521 Setting the mirror to nominal height , fabian.arellano

  • 16532 Comment , shinji.miyoki

  • 16529 Comment , fabian.arellano

PRM

• 16518 PRM BF-LVDT replacement , yoichi.aso

  • 16534 Comment , yoichi.aso

SR2

• 16509 Lowering the pre-isolator , fabian.arellano

This is generated by python script in /users/Miyo/dropbox/Script/scrapping/main.py.

Summary Report

Type-A

• Installing the pre-isolator in EY.
• There were some problems; Overload of F0, touching of the secondary coil in F1.

Type-B

Type-Bp

PR2

• We helped Matteo to apply First contact.
  • We locked the payload. We used two loops of cable ties to completely and robustly immobilize the RM.
  • We set at the AR side of the mirror (+X side) the jig that Hirata-san designd to protect the mirror surface and the RM from spurious drippings of First Contact:
    • In a first attempt, the jig did not reach the surface of the mirror. This happened because the mirror assembly was not immobilized in the same place as in the 3D-CAD. It was displaced towards the -X side and had some pitch and yaw.
    • With some improvisation and also using the purposely built adjustment in the jig, it was possible to adjust the position and orientation of the jig to make it reach the surface.
  • Then Matteo proceeded to apply First Contact with a brush.
  • Once finished we installed the jig for the HR side (-X side). It was easy to make it reach the surface of the mirror because the mirror was displaced in that direction. Then we applied First Contact.
  • On the following day we removed the first contact and cleaned some remaining bits with acetone.
    • The AR side is clean at the center and away from it there is some residue.
    • The HR side had a spec close to the center.
  • FC was applied again to the HR side and the spec became smaller but it didn't disappear completely. It seems the intention is to apply FC again before closing the chambers.
  • We released the payload.

PRM

• We checked again the suitable height of the SF keystone to have the mirror in the suitable place. We had three different values measured at different dates.
• The LVDT is not calibrated, so we didn't have an idea how far they were from each other.
• We locked the keystone at the three position and measured the distance from an arbitrary point: they were within 0.71 mm. Sounds within the uncertainty introduced by a laser level with a 2 mm laser line, so it's fine.
• We checked H2 OSEM was properly tightened in place.
• We added spherical washers and screws to the rods of the magnetic damper security structure. For some reason they had not been installed.

TypeC

Electronics

Control

Safety

Discussion

• [Terrence] Just a reminder of the existence of this suspension commissioning document

  • This is a compilation of various knowledge and techniques related to suspensions (mostly software).
  • I hope this document can help the upcoming suspension commissioning and, more importantly, for longevity as people left KAGRA along with their methods.
  • I have compiled a comprehensive list of suspension commissioning tasks to be done. (These tasks are foreseen to be recurring in the future.)
  • The list consists of ordered tasks focusing on satisfying residual motion and displacement noise requirements.
  • I am still writing the method sections, which consist of methods on how to complete the tasks. Two types of methods (baseline/fallback and advanced) (give examples).
  • I have also been programming these techniques as I write them, so implementation will be readily available.

  • Kontrol tutorials are available here, and more tutorials will be available in notebook format in the same repository as well as the suspension commissioning document repository.

  • I will be working on this. I hope to finish this in one-two weeks. I will be updating the progress.
  • Please have a sneak peek and tell me if you any comments or questions, or if you think that there are some other important things to be added in the document.

Travel Plans

The week from 5/24

• Takahashi: 5/24-28
• Sato: 5/24-28
• Hirata: 5/24-28
• Yano: 5/24-28

The week from 5/31

• Takahashi: 5/31-6/4
• Sato: 5/31-6/4
• Hirata: 5/31-6/4
• Yano: 5/31-6/4

Next meeting

• 2021/5/28(FRI)