Differences between revisions 1 and 25 (spanning 24 versions)
⇤ ← Revision 1 as of 2021-04-20 07:08:54 →
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Editor: KousekiMiyo
Comment:
← Revision 25 as of 2021-04-23 17:36:30 → ⇥
Size: 8880
Editor: RyutaroTakahashi
Comment:
Deletions are marked like this. Additions are marked like this.
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Date : 13:30-14:15 Date : 13:00-14:00
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Participants : Takahashi, Kimura, Ikeda, Uchiyama, Hirata, Sato, Aso, Ushiba, Miyoki, Miyo Participants: Takahashi, Sato, Ikeda, Ushiba, Miyo, Aso, Kimura, Uchiyama, Tomaru
Line 15: Line 15:
 * IX: Oplev will be finalized in April. Alignment adjustment is scheduled on 4/20. ACC will be installed in April.
  * Height adjustment ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16487|summary]]).
 * IY: Remedy of the pre-isolator will be postponed.
 * EX: Height and alignment adjustments are scheduled in 4/21-22.		  * IX: Oplev setting is on going. Final setting of height was scheduled on 4/26. ACC tuning is scheduled on 4/24.
 * IY: Remedy of the pre-isolator was postponed.
 * EX: Height adjustment is on going ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16535|Measurement]]). Rough setting was scheduled on 4/27.
Line 22: Line 21:
 * Corrugate tube fixing jig: They will be prepared by the end of May.  * Corrugate tube fixing jig: Implementation for IXV is scheduled on 4/28.
Line 25: Line 24:
 * Acceptance check: Meeting was set every Friday to decide the acceptance check items.
 * PF actuator: After the commissioning for suspension.		  * Acceptance check: Meeting (workshop) was set every Friday to make the acceptance check document.
 * PF actuator: After SC.
Line 28: Line 27:
 * Overall commissioning: Schedule meeting will be held on 4/19.
 * Procedure of TM height setting: Prepare the adjustable range tables.		  * Overall commissioning: Schedule meeting was held on 4/19.
 * Procedure of TM height setting: Plan for IX/EX.
Line 34: Line 33:
14:15-15:30 14:00-15:00
Line 36: Line 35:
Participants: Takahashi, Fabian, Hirata, Ishizaki, Miyo, Sato, Miyoki, Washimi, Terrence, Aso, Tanaka Participants: Takahashi, Fabian, Hirata, Ishizaki, Miyo, Tanaka, Sato, Sugiyama, Terrence, Aso
Line 41: Line 40:
 * Type-A team: IXV 4/20, EXV 4/21-22
 * Type-B team: Remaining work on Type-B/Bp.		  * Type-A team: IXV 4/26, EXV 4/28, IXV(fixing jig) 4/28
 * Type-B team: PRs.
Line 61: Line 60:
'''EX'''

 * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16535|16535]] Height adjustment of ETMX , __ryutaro.takahashi__
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 * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16506|16506]] Deleted unnecessary processes from VIS model file. , __satoru.ikeda__
* [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16506|16506]] Deleted unnecessary processes from VIS model file. ,  __satoru.ikeda__
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 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16421|16421]] Height adjustment of ITMX , __ryutaro.takahashi__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16499|16499]] Comment , __ryutaro.takahashi__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16421|16421]] Height adjustment of ITMX , __ryutaro.takahashi__
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16499|16499]] Comment , __ryutaro.takahashi__
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16519|16519]] Comment , __ryutaro.takahashi__

'''MCE'''

 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16512|16512]] MCe oplev characterization , __takaaki.yokozawa__
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16525|16525]] Comment , __takaaki.yokozawa__
  * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16522|16522]] Comment , __tomotada.akutsu__
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Line 69: Line 83:
'''MCF'''
Line 72: Line 85:
 * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16537|16537]] MCo suspension strange , __tomotada.akutsu__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16157|16157]] Investigation of IMC suspensions , __ryutaro.takahashi__
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16513|16513]] Comment , __kouseki.miyo__
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 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16348|16348]] Tightening the locating clamps for the piano wire. , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16502|16502]] Comment , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16520|16520]] Thermistor installation , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16521|16521]] Setting the mirror to nominal height , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16348|16348]] Tightening the locating clamps for the piano wire. , __fabian.arellano__
  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16502|16502]] Comment , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16520|16520]] Thermistor installation , __fabian.arellano__
  * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16533|16533]] Comment , __fabian.arellano__
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16521|16521]] Setting the mirror to nominal height , __fabian.arellano__
  * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16532|16532]] Comment , __shinji.miyoki__
  * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16529|16529]] Comment , __fabian.arellano__

'''PRM'''

 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16518|16518]] PRM BF-LVDT replacement , __yoichi.aso__
  * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16534|16534]] Comment , __yoichi.aso__
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 * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16509|16509]] Lowering the pre-isolator , __fabian.arellano__  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16509|16509]] Lowering the pre-isolator ,  __fabian.arellano__
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 * Height adjustment of ITMX ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16487|summary]]).
 * Investigation of the stepper motor driver.
 * Tuning of the ACCs.		  * Checked the FR range in EX. The range of F0 was small (+/-1mm). The coupler for shaft will be replaced from a rigid type to a flex type.
=== 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.
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=== TypeB ===
=== Type-Bp ===
 * I checked how large the buoyancy effect is in PR suspensions.
  * See klog.
  * Some values look very big. I guess this is due to LVDT card replacemet without the adjustment of resistors.
 * We checked the accuracy of two laser levels.One of them was very bad and discarded. The other one was very good.
 * Miyoki-san has bought another laser level already.

==== PR3 ====
 * Using the good laser level and the picomotor we set the pitch of the mirror to -3.3 mrad (Thursday).
 * We moved the BF keystone close to the setpoint.
 * We released the SF and closed the vacuum chamber.
 * The vertical OSEMs were either out of range or close to the end of their ranges. We moved them into range.
 * We measured a few IM transfer functions. The system looks healthy.
 * Just to check reproducibility, we measured the pitch again and got the expected value of -3.3 mrad (Friday).

==== PR2 ====
 * We tested the pitch stability with the Trunp method. We did three rounds and the changes were
  * 398 µrad,
  * -398 µrad
  * -663 µrad.
 * Then we checked the mirror pitch with respect to the horizontal; we measured '''11 mrad'''. We thought it was too much so we decided to check the accuracy of the laser level.
 * We repeated the measurement with the good laser level and got '''5 mrad''', which was more resonable. Using the picomotor we moved it to '''3.3 mrad'''.
 * We released the SF and closed the chamber.
 * Transfer function measurements showed the system was healthy.
 * Although ther suspension was already hanging free, we checked the position of the vertical OSEMs just to make sure the flags were not close to touching. We decided to move V2 and V3 panels.
 * '''When we finished we measured the pitch again with the good laser level and didn't get 3.3 mrad, 1.2 mrad! We don't know what could have changed.<<BR>> '''
 * '''We remember another instance in which the pitch changed unexpectedly (after the tightening of the clamps). We need to keep watching it.'''

==== Remaining work ====
 * Replacement of a broken LVDT driver (PRM?)
 * Set the mirrors to nominal height.
  * Terada-san's height marks seem gone.
   * PR2 doesn't have one.
   * We found one in PR3 chamber which may be Terada-san's one, but there's no indication.
   * We haven't checked PR3 chamber yet.
  * We must take into account that some LVDT drivers were replaced and the LVDTs were not recalibrated.
  * A possible procedure would be something like this:
   * Set the SF in nominal height per 3D-CAD.
   * Set the laser level at the nominal mirror height.
   * Move the BF keystone until the mirror is at the nominal height.
   * Take a note of the setpoints and modify medm screens.
   * Move vertical OSEMs if necessary.
 * Before pump down set the keystones to heights according to the buoyancy corrections.
 * Fishing rods in PR2 and PR3 seem to be working fine.		 In PR2 Hirata-san and Tomaru-san made height markings for aligning the mirror.
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 * We are characterizing the OpLev of IMC suspensions. Power of the SLD, beam profile, wave length, and calibration of the OpLev.
 * 		 * Strange behavior of MCo suspension was reported in the acceptance review for IMC.
Line 138: Line 148:
Line 140: Line 151:
Suspension commissioning details and plans? [Terrence]

 * Has it been discussed? To me, it is still very unclear how it should be done and what people expect. If it has been discussed before, it seems to me it is not transparent.
 * I would like to call for a meeting. In the meeting, we should discuss how should SC be done, including but not limited to topics like:
  * The scope of the suspension commissioning.
  * What are some deliverables?
  * How should tasks be done? (E.g. Sensor alignment, noise estimation, etc..)
  * What methods should we use? (I propose to use a benchmark so we accept multiple methods, for now.)
  * What are some evaluations that should be done? (E.g. We should make a report for each suspension about what has been done and what are some objective quantities that we measured to confirm the performance of the suspensions)
  * How to interface with interferometer commissioning? (We shouldn't think of suspension commissioning as something that can be done once and for all. Instead, we need to get input from the interferometer and recursively update our strategies.)
  * Someone should roughly plan out the timeline (at least from start to finish).
 * I will be drafting a document, which I hope to serve as a handbook/rules for suspension commissioning so everything is clear to everyone.
  * I found Miyo-san's suspension comissioning document [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12444|JGW-E2112444-v2]]. But there are many more things that I would like to address and discuss in detail, for example, how exactly should we do sensor diagonalization? How should we measure performance?
 * Which mailing list should I use, to organize the meetings? gokagra?		  * Found some questions when I was writing the [[https://github.com/gw-vis/vis-commissioning-tex|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.
Line 156: Line 165:
The week from 4/19

 * Takahashi: 4/19-23
 * Sato: 4/19-23
 * Hirata: 4/19-23
Line 168: Line 171:
The week from 5/3

 * Hirata: 5/7-9
Line 169: Line 176:
 * 2021/4/23(FRI)  * 2021/4/30(FRI)

Contents

  1. Agenda/Minutes
  2. CRY+VIS Interface Meeting
    1. Schedule
    2. Status
    3. Discussion
  3. VIS Meeting
    1. Schedule
    2. Klog
    3. Summary Report
      1. TypeA
      2. TypeB
      3. Type-Bp PR3
      4. TypeC
      5. Electronics
      6. Control
    4. Safety
    5. Discussion
    6. Travel Plans
    7. Next meeting

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date : 13:00-14:00

Participants:　Takahashi, Sato, Ikeda, Ushiba, Miyo, Aso, Kimura, Uchiyama, Tomaru

Post O3 Upgrade portal

Schedule

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

  • EX: Height adjustment is on going (Measurement). Rough setting was scheduled on 4/27.

  • 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 (workshop) was set every Friday to make the acceptance check document.
  • 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

14:00-15:00

Participants: Takahashi, Fabian, Hirata, Ishizaki, Miyo, Tanaka, Sato, Sugiyama, Terrence, Aso

Schedule

See Schedule

  • Type-A team: IXV 4/26, EXV 4/28, IXV(fixing jig) 4/28
  • 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

  • Checked the FR range in EX. The range of F0 was small (+/-1mm). The coupler for shaft will be replaced from a rigid type to a flex type.

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

  • Strange behavior of MCo suspension was reported in the acceptance review for IMC.

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)

KAGRA/Subgroups/VIS/VISMinutes20210423 (last edited 2021-04-23 17:36:30 by RyutaroTakahashi)