= Agenda/Minutes on 2021/1/22 = [[https://zoom.us/j/203743987|Zoom Meeting]] = CRY+VIS Interface Meeting = 13:30-14:00 Participants: Takahashi, Sato, Hirata, Ikeda, Miyo, Ushiba, Tomaru, Kimura, Aso [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] * Schedule for IX: Cabling for the payload is scheduled from 1/26. Connection is scheduled in the week of 2/8. * Schedule for IY: Cooling of payload was started from 1/18. * Schedule for EX: Connection of ETMX was scheduled in the week of 3/15. * Corrugate tube fixing jig: Re-measurement at the beginning of March (3/1-3) in IYV is planed. Deformation of the bottom ring of top-chamber would be large. * Commissioning in vacuum: * Acceptance check: Cryo-payload in IX and Type-A tower in EY are on going. * Jig for FC painting: Under manufacturing. * PF actuator: by the end of January. = VIS Meeting = 14:00-15:30 Participants: Takahashi, Sato, Hirata, Miyo, Aso, Iguchi, Ishizaki, Tanaka, Washimi, Terrence == Progress report == === General === === Type-A === * Installation in EYV. * Going to the F3 stage. * Blades for FR in the F3 was replaced. Checked the motion of FR. * Measured the spectrum of BF LVDT. * Mounted the F3 on the EQ stop. The BF was suspended by the F3. * Prepared the cables between the BF and F3. * The cabling work from BF to F3 was completed. * Stepper motor driver in EYV * One channel of the stepper motor driver for GAS had failed. [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15785|k-log]] === Type-B === Albums * [[https://photos.app.goo.gl/YiRfy6a9uDf4rvcKA|BS remedying work after O3]] * [[https://photos.app.goo.gl/4cvWnXCdCsf9WiYf7|SR2 remedying work after O3]] * [[https://photos.app.goo.gl/X2eaBxsZGaRHYAQK6|SR3 remedying work after O3]] * [[https://photos.app.goo.gl/6C5tGpn7CLgGUG9y6|SRM remedying work after O3]] Week of the 18th of January Hirata-san worked in the design of the thermistor holder, cabling, etc. SRM I disconnected SRM picomotor drivers to move them away from the assembly frame. I failed to report it in a klogin due time. BS * Miyo-kun, Hirata-san and I reviewed the IP transformation matrices from IP LVDTs to L, T and Y and from actuation in L, T and Y to real coil-magnet actuator. We found a few of inconsistencies in existing documents. See klog reports [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15769|15769]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15776|15776]]. * We recovered the IP alignment: * See klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15782|15782]]. * I updated the medm screen with these matrices. Diagonalization is pending. * I moved the IP close to the setpoint using horizontal FRs. * I turned the control system on by hand and works fine. (I tried using Guardian but it keeps using the old setpoint values despite I took a snapshot.) * I moved BF keystone to around zero. (F1 keystone has been in midrange for a long time and we should not move it unless it's absolutely necessary.) * We went to the tunnel and recovered the oplev readout. We had to move the suspension in yaw by a lot (mrad maybe) using the new F0-Y stepper motor. * After recovery I measured TFs in the IP. They look fine, but in IP-L and IP-T the coherence is low from 150 mHz to 400 mHz. Terrence suggested to check coherence with ground motion and we cna also increase the amount of actuation. * We finally got to add ballast mass on top of BF: * When we began working the temperature was 23.1 degrees but when we finished it was 23.5 degrees ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15809|klog 15809]]), likely due to the coach filters ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15810|klog 15810]]), but this morning it was 23.0 degrees. * The final result is that the keystone is now about 16 um above the goal. It requires -1,100 counts of coil-magnet actuation to reach it. After pump down we can use the FR to move it closer if we think it's suitable. * The aligmment of the OSEMs didn't change much. * IM TF measuements reveal that the system is healthy. * Things left to do in BS suspension: * In F0 adjust ballast mass, FR position and limit switch positions. * Tune IP resonant frequency. * Measure IP-LVDT sensitivity. * Install oplev box (what is the status?) * Install outer frame large beam? (what is the status?) Plan for next week SR3 * Alignment recovery after cabling (it seems they want to use it next week for injecting green light.) * Preparation for ballas mass adjustment. === Type-Bp === [Fabian] What's the plan for next week? It is something like this: * Traverser cable change? * Gluing wire in PR3? === Type-C === === Controls === Although I told you that I explain my document for Suspension Commissioning, I should write more information. [[https://docs.google.com/document/d/1LfWFfzdWr6xrGkzuy5gLxuKQ3hOtdXHswb2HeZFqrtE/edit?usp=sharing|here]] === Electronics === * Compared the TFs of modified LVDT board with the original board. Reduction of 50dB in the TF was found. * Actual effect should be measured using the BF damper in PR. == Towards O4 == * Type-B remedy work is on going. * Installation of Type-A is on going in EY. * Schedule. * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11475|Chart]] * Procedure documents. * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5500|Type-A tower installation]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11598|Limit switches]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11520|Limit switch connecting guide]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11978|Replacement of TF blades]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11878|Wire gluing in PR3]] * [[https://onedrive.live.com/?authkey=!AOLVVVKJ_Zpn-2c&cid=1447B05D5B571A84&id=1447B05D5B571A84!26691&parId=1447B05D5B571A84!26683&o=OneUp|Type-B remedying work]] * Criteria in the acceptance test. * [[https://www.dropbox.com/s/6bv15yy6hg0wn40/Acceptance%20Test%20Documentation.docx?dl=0|Inspection document (sample)]] == Safety == == Discussion == * BS control noise == Travel Plans == The week from 1/25 * Takahashi: 1/25-29 * Sato: 1/25-29 * Hirata: 1/25-29 * Yano: 1/25-29 The week from 2/1 * Takahashi: 2/1-5 * Sato: 2/1-5 * Hirata: 2/1-5 * Yano: 2/1-5 == Next meeting == * On 2020/1/29(Fri)