Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date : 13:00-

Participants :

Post O3 Upgrade portal

Schedule

• IX: Oplev setting is on going. Final setting of height is scheduled on 4/26-27. ACC tuning is scheduled on 4/24.
• IY: Remedy of the pre-isolator was postponed.

• EX: Height adjustment is on going (Measurement).

• EY: Installation of the tower will be restarted in May. Removing of the maraging rod is necessary.

Status

• Corrugate tube fixing jig: Implementation for IXV is scheduled on 4/28.
• Commissioning in air: From mid. May for IX.
• Commissioning in vacuum:
• Acceptance check: Meeting was set every Friday to decide the acceptance check items.
• PF actuator: After SC.
• Jig for FC painting:
• Overall commissioning: Schedule meeting was held on 4/19.
• Procedure of TM height setting: Plan for IX/EX.

Discussion

VIS Meeting

13:30-

Participants:

Schedule

See Schedule

• Type-A team: IXV 4/26-28
• Type-B team: PRs.

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

TypeA

TypeB

Type-Bp PR3

• On Tuesday
  • We corroborated that the horizontal line drawn on white tape was on the chamber was Terada-san's height mark.
  • We went ahead in trying to set the mirror to the appropriate height
    • We set the SF keystone to nominal height per the 3D-CAD (65.5 mm from base plate).
    • The mirror was at the right height when moving the BF FR all the way to its upper limit and using 30,000 counts of actuation.
    • This meant it is not suitable to set the SF keystone to the 3D-CAD nominal height.
• On Wednesday
  • We installed the thermistor on the security structure pillar above the IRM.
  • Just for the record, we measured the height of the mirror when the SF was at nominal height per the 3D-CAD and the BF was at the setpoint:
    • It was 2.2 mm below.
    • There's also some roll: there's 1 mm difference in height between the RM sides.
  • Then we moved the SF keystone up with the fishing rod until the mirror asembly was at the nominal height:
    • The SF FR was all all the way up and the buoyancy correction still has to be acconted for.
    • The temperature was very high; 24.7 degrees.
    • We began thinkng removing mass frlom the top of BF was necessary.
• Thursday
  • We put kapton sheet between the thermistor and the aliminuim holder and covered the legs of the thermistor with PEEK tube.
  • The temperature decresed to about 23.6 degrees due to the quick reaction of Miyoki-san and others.
  • We were able to set the mirror to nominal height with the BF at the setpoint and the SF FR roughly in mid-range.
  • We also corrected a systematic error in settting the height: the laser line has a thickness of about 2 mm.
  • We moved the SF stepper motor shaft stop screws to the very top to allow for more range:
    • Now the total range is more than 5 mm and
    • The keystone new setpoint is -585 um.
    • The buoyancy effect is 585 um, so there plenty of FR range.

In PR2 Hirata-san and Tomaru-san made height markings for aligning the mirror.

TypeC

Electronics

Control

Safety

Discussion

• Found some questions when I was writing the suspension commissioning document [Terrence]

  • IP tuning with asymmetric longitudinal and transverse resonance frequency.
  • Residual motion requirements inconsistency (0.2 urad (Sekiguchi) vs 0.01 urad (LIGO)).
    • Derived from beam spot misalignment. (Sekiguchi used 1 mm, some other KAGRA literature used 0.1 mm).
    • This made me question other requirements as well.
• Schedule [Terrence]
  • I can't help but noticed that only 1 week is assigned for Type-B suspension commissioning, and 2 weeks for Type-A. This is far from sufficient from my experience.
  • Can I use one of the suspensions after commissioning? I really really really need this for my PhD. I can work at midnight or 24 hours a day, if I have to.
• Potential error in MC optical lever calibration [Terrence]
  • Didn't take incidence angle into account.
  • I cannot change the calibration factor from the MEDM screen.
  • As discussed before, it would be calibrated to um/counts before diagonalization.

Travel Plans

The week from 4/26

• Takahashi: 4/26-28
• Sato: 4/26-5/1
• Hirata: 4/26-28

The week from 5/3

• Hirata: 5/7-9

Next meeting

• 2021/4/30(FRI)