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=== BS ===
 * Top Filter fishing rod adjustment.
  * We set up the software and hardware limit swtiches of the FR such that the moving range is [-75,200 ; 2,052,035] steps, producing an ''approximate'' displacement range of the keystone of [-1.6 , 2.1] mm.
 * Top filter ballast mass.
  * We set the FR to the mid-point.
  * Then we added 43.7 grams of ballast to leave the keystone very close to 1,252 um, which is the buoyancy corrections value. We did this while having the IP free.
  * The tempertature was a bit low, but this is not expetected to create problems: T=22.8 °C.
  * While doing this work we realized the IP locking mechanism produces deformation of the the IP table, creating a change in the F0 LVDT readout of up to 0.9 um when tightened strongly! Of course, we don't need to lock the IP that strongly.
 * IP ballast mass addition.
  * We added 8.9 kg: 2 × 10 mm × 120° arch weights, one 4.5 kg and and another one 4.4 kg.
  * The resonant frequencies of the IP are
   * '''IP-L: 66 mHz'''
   * '''IP-T: 66 mHz'''
   * '''IP-Y: 129 mHz'''
   * Temperature: 22.7 °C.
   * We need to check by how much they change when the temperature increases (O3GK = 23 °C, maximum lately: 23.8°C).
 * We measured IP and IM transfer functions.
  * They look fine but some of them have low coherence in narrow bands or look less smooth than expected.
  * Next week I would like to double-check the IP LVDT cabling in case there's anything strange.
 * Thermistor.
  * We installed the thermistor.
  * After today's morning meeting, Hirata-san connected the cables differently: two cables had been originally connected to the same terminal, he removed one of them and it worked.
  * Hirata-san and Ikeda-san tested it with the controller and compared its readout with that of a thermocouple and PEM's ondotori.The result was satisfactory.
  * However, when the in-vacuum cable is touched, the readout changes a lot, so we need to change the cable.
Line 121: Line 146:

Agenda/Minutes

Zoom Meeting


CRY+VIS Interface Meeting

Date: 2021/5/28 13:00-

Participants:

Post O3 Upgrade portal

Schedule

  • IX: Setup of Geophones/ACCs are on going.
  • IY: GAS blades of F0 were replaced. Installation of the cryo-payload is scheduled on 5/31-6/1.
  • EX: Additional FR was modified. Light source for Oplev has a problem.
  • EY: Installation of tower is in the pre-isolator stage. Mirror was taken out. Delivery of pure water generator is delayed.

Status

  • Corrugate tube fixing jig: Other 3 sets will be ready by the end of June.
  • TM height setting: Confirmed the height of EQ stop using the height standard near the cross tube in IX.
  • 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:

Discussion


VIS Meeting

14:00-

Participants:

Schedule

See Schedule

  • Type-A team: IYV 5/31, EYV 6/21-4
  • 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

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

Type-B

BS

  • Top Filter fishing rod adjustment.
    • We set up the software and hardware limit swtiches of the FR such that the moving range is [-75,200 ; 2,052,035] steps, producing an approximate displacement range of the keystone of [-1.6 , 2.1] mm.

  • Top filter ballast mass.
    • We set the FR to the mid-point.
    • Then we added 43.7 grams of ballast to leave the keystone very close to 1,252 um, which is the buoyancy corrections value. We did this while having the IP free.
    • The tempertature was a bit low, but this is not expetected to create problems: T=22.8 °C.
    • While doing this work we realized the IP locking mechanism produces deformation of the the IP table, creating a change in the F0 LVDT readout of up to 0.9 um when tightened strongly! Of course, we don't need to lock the IP that strongly.
  • IP ballast mass addition.
    • We added 8.9 kg: 2 × 10 mm × 120° arch weights, one 4.5 kg and and another one 4.4 kg.
    • The resonant frequencies of the IP are
      • IP-L: 66 mHz

      • IP-T: 66 mHz

      • IP-Y: 129 mHz

      • Temperature: 22.7 °C.
      • We need to check by how much they change when the temperature increases (O3GK = 23 °C, maximum lately: 23.8°C).
  • We measured IP and IM transfer functions.
    • They look fine but some of them have low coherence in narrow bands or look less smooth than expected.
    • Next week I would like to double-check the IP LVDT cabling in case there's anything strange.
  • Thermistor.
    • We installed the thermistor.
    • After today's morning meeting, Hirata-san connected the cables differently: two cables had been originally connected to the same terminal, he removed one of them and it worked.
    • Hirata-san and Ikeda-san tested it with the controller and compared its readout with that of a thermocouple and PEM's ondotori.The result was satisfactory.
    • However, when the in-vacuum cable is touched, the readout changes a lot, so we need to change the cable.

Type-Bp

TypeC

Electronics

Control

Safety

Discussion

Travel Plans

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

The week from 6/7

  • Takahashi: 6/7-11
  • Sato: 6/7-11
  • Hirata: 6/7-11
  • Yano: 6/7-11

Next meeting

  • 2021/6/4(FRI)

KAGRA/Subgroups/VIS/VISMinutes20210528 (last edited 2021-05-29 11:58:53 by RyutaroTakahashi)