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Deletions are marked like this. | Additions are marked like this. |
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* Height adjustment of the pre-isolator with pistons. | * Height adjustment ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16487|summary]]). |
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* [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16447|16447]] Support for common Tower/Payload model files: Type-B(BS) supports TOWER_MASTER and PAYLOAD_MASTER. , __satoru.ikeda__ | * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16447|16447]] Support for common Tower/Payload model files Type-B(BS) supports TOWER_MASTER and PAYLOAD_MASTER. , __satoru.ikeda__ |
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* (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16465|16465]] Laser level deviation from the horizontal. , __fabian.arellano__ * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16465|16465]] Laser level deviation from the horizontal. , __fabian.arellano__ * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16466|16466]] Comment , __tomotada.akutsu__ |
* [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16465|16465]] Laser level deviation from the horizontal. , __fabian.arellano__ * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16466|16466]] Comment , __tomotada.akutsu__ |
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* (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16468|16468]] Tuning of LVDT type accelerometer for ITMX , __kouseki.miyo__ * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16365|16365]] Wiring the release sensor (outside the vacuum chamber) , __naohisa.satou__ |
* [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16468|16468]] Tuning of LVDT type accelerometer for ITMX , __kouseki.miyo__ * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16365|16365]] Wiring the release sensor (outside the vacuum chamber) , __naohisa.satou__ |
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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=16421|16421]] Height adjustment of ITMX , __ryutaro.takahashi__ |
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* (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16472|16472]] Comment , __ryutaro.takahashi__ | * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16472|16472]] Comment , __ryutaro.takahashi__ * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16480|16480]] Comment , __satoru.ikeda__ * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16487|16487]] Comment , __ryutaro.takahashi__ |
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* (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16463|16463]] Taking picture of MCo coils , __takaaki.yokozawa__ | * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16463|16463]] Taking picture of MCo coils , __takaaki.yokozawa__ |
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* [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16417|16417]] Tightening of the inner wire locating clamps. , __fabian.arellano__ | * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16417|16417]] Tightening of the inner wire locating clamps. , __fabian.arellano__ |
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* (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16469|16469]] Comment , __fabian.arellano__ | * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16469|16469]] Comment , __fabian.arellano__ * (!) [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=16484|16484]] Comment , __fabian.arellano__ '''PR3''' * [[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=16486|16486]] Comment , __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. |
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=== Type-Bp PR2 === This week we inspected and tightened the wires clapms in PR2. We followed the same procedure as in PR3, so I won't write any details here. |
=== 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. |
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* We removed the IRM side panels and measure the gaps in different places using thickness gauges: * Largest gap: 220 um close the wire, but smaller exactly where the wire is. * Smallest gap: (50 , 60 ) um. * We tightened the clamps according to the specification: 10 Nm for the weight holding ones and 2 Nm for the locating ones. * 10 out of 12 screws rotated by small amounts when tightened, however, * The two screws of the locating clamp at the +Y side were completely loose. * After we re-assembled and released the payload we realized it had a lot of negative pitch (I wrote positive in the klog, sorry) and at least one OSEM flag was touching. * We corrected the pitch with the picomotor. * We also moved the BF keystone close to nominal position with the fishing rod. * Then we corrected IM yaw. * We found picomotor cables and stepper motor cables disconnected, so we connected them. * By the end of today's work the IM seemed to be hanging free. * We tried to measure TFs, but it seems the actuation is not going through because of a problem in the real-time model. Miyo-kun and Ikeda-san will take a look. |
==== 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. |
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* Before pumping down the IMC area, we have to write acceptance document for review. This document will be organized by Akutsu-san with some VIS people (Miyo, Takahashi) |
* We are characterizing the OpLev of IMC suspensions. Power of the SLD, beam profile, wave length, and calibration of the OpLev. |
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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? |
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The week from 4/12 * Takahashi: 4/12-16 * Sato: 4/12-16 * Hirata: 4/12-16 |
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The week from 4/26 * Takahashi: 4/26-28 * Sato: 4/26-5/1 * Hirata: 4/26-28 |
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* 2021/4/16(FRI) | * 2021/4/23(FRI) |
Contents
Agenda/Minutes
CRY+VIS Interface Meeting
Date : 13:30-
Participants :
Schedule
- IX: Oplev will be finalized in April. Height and alignment adjustments are on going. ACC will be installed in April.
Height adjustment (summary).
- IY: Remedy of the pre-isolator will be postponed.
- EX: Height and alignment adjustments are scheduled in 4/20-23.
- EY: Installation of the tower will be restarted in May. Removing of the maraging rod is necessary.
Status
- Corrugate tube fixing jig: They will be prepared by the end of May.
- Commissioning in air: From mid. May for IX.
- Commissioning in vacuum:
- Acceptance check: Check items for in-air commissioning should be confirmed on the payload.
- PF actuator: After the commissioning for suspension.
- Jig for FC painting:
- Overall commissioning:
- Procedure of TM height setting: Prepare for the measurement in the first in-vacuum commissioning in IX.
Discussion
VIS Meeting
14:30-
Participants:
Schedule
See Schedule
- Type-A team: EXV 4/20-23
- Type-B team: Remain work on Type-B/Bp.
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
BS
16447 Support for common Tower/Payload model files Type-B(BS) supports TOWER_MASTER and PAYLOAD_MASTER. , satoru.ikeda
General
16446 Model files have been modified. , satoru.ikeda
16445 Buoyancy effect in PR suspensions. , fabian.arellano
16465 Laser level deviation from the horizontal. , fabian.arellano
16466 Comment , tomotada.akutsu
IX
16468 Tuning of LVDT type accelerometer for ITMX , kouseki.miyo
16365 Wiring the release sensor (outside the vacuum chamber) , naohisa.satou
16438 Comment , naohisa.satou
16421 Height adjustment of ITMX , ryutaro.takahashi
MCF
16463 Taking picture of MCo coils , takaaki.yokozawa
PR2
16417 Tightening of the inner wire locating clamps. , fabian.arellano
PR3
16348 Tightening the locating clamps for the piano wire. , fabian.arellano
16486 Comment , fabian.arellano
This is generated by python script in /users/Miyo/dropbox/Script/scrapping/main.py.
Summary Report
TypeA
Height adjustment of ITMX (summary).
- Investigation of the stepper motor driver.
- Tuning of the ACCs.
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.
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.
- Terada-san's height marks seem gone.
- Before pump down set the keystones to heights according to the buoyancy corrections.
- Fishing rods in PR2 and PR3 seem to be working fine.
TypeC
We are characterizing the OpLev of IMC suspensions. Power of the SLD, beam profile, wave length, and calibration of the OpLev.
Electronics
Control
Safety
Discussion
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 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?
Travel Plans
The week from 4/19
- Takahashi: 4/19-23
- Sato: 4/19-23
- Hirata: 4/19-23
The week from 4/26
- Takahashi: 4/26-28
- Sato: 4/26-5/1
- Hirata: 4/26-28
Next meeting
- 2021/4/23(FRI)