Contents
Agenda/Minutes
CRY+VIS Interface Meeting
Date : 13:00-
Participants :
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
MCE
16512 MCe oplev characterization , takaaki.yokozawa
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
PRM
SR2
![/!\](/moin_static193/modern/img/alert.png "/!\"){kind=small}
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16520 Thermistor installation , fabian.arellano
- 16533 Comment , fabian.arellano
16521 Setting the mirror to nominal height , fabian.arellano
PRM
SR2
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16509 Lowering the pre-isolator , fabian.arellano
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Summary Report
TypeA
TypeB
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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.
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Type-Bp
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TypeC
Electronics
Control
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Safety
Discussion
Found some questions when I was writing the suspension commissioning document [Terrence]
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- 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.
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- Potential error in MC optical lever calibration [Terrence]
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- 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]
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- 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.
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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)