= Agenda/Minutes on 2020/10/16 = [[https://zoom.us/j/203743987|Zoom Meeting]] = CRY+VIS Interface Meeting = 13:30-14:00 Participants: Takahashi, Sato, Hirata, Ikeda, Miyo, Hagiwara, Kimura, Aso, Tomaru, Ushiba, Akutsu * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] * Cable bandling bellow BF.([[attachment:Assy small hexagon for BF-CRYO.pdf]]) * PF actuator * IP monitoring improvement in vacuum pumping -> auto-tracking system * safe mode switching schedule of WAB * Yano-san's schedule = VIS Meeting = 14:00-15:30 Participants: Takahashi, Fabian, Hirata, Iguchi, Ishizaki, Miyo, Tanaka, Sato, Suguyama, Terrence, Aso == Progress report == === General === [Fabian] * I wrote a document about the procedure to replace the LVDT cards after a failure: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=12128|JGW-T2012128]]. * It was checked by Alessandro Betolini from Nikhef and he says the method is correct. He provided minor comments that have been incorported to the new version of the document. * He says they will review the design for ETpathfinder and that's our chance to give them feedback (i.e. Tanaka-san's findings and my concerns as a user). * Knowledge transfer from Tanaka-san to Alessandro would be greatly beneficial for KAGRA. If you think it's suitable, would it be possible for someone to organize this, please? * Tanaka-san will take some of our LVDT cards for hardware modification. * We need to survey those LVDT cards before he takes them away. '''When will we do this?''' * As far as I understand, given the old calibration factor, he has to give us a procedure to calculate a new calibration factor. '''Is this statement correct?''' * Before any other card breaks, we need to survey all of them. '''When will we do this?''' * Four hands are required for the measurements. '''For Type-B/Bp, Washimi-san and Fabian can do it'''. * After cleaning the PR area I have the impression '''we lost Hirose-san's LED lamps''' to check mirror cleanliness. [Washimi] * [[https://app.holobuilder.com/app/?p=6610079827099648|Cleaning results]] === Type-A === * We went to clean-up of each clean booth. === Type-B === * I gave some feedback for the noise budget paper. * We finished the cleaning with a lot of help. * Hirata-san made M6 holes in some ballast masses. * We removed some cables from chassis for the cleaning procedure. * I put the fibre optic camera in the PR clean booth buffer area. * We recovered the suspensions after blackout. They all went to ALIGNED state well. * The temperature has decreased a lot inside the clean rooms, likely due to an increase of cold air circulation after turning all FFUs on. A couple of DC control loops in GAS filters are about to saturate. I've reported this to Miyoki-san and he turned on some heaters. === Type-Bp === * After the blackout PR2 went to ALIGNED state well. PR3 and PRM oplevs were removed before recovery and I just checked they went to TWR_DAMPED state. I can turn the IM control system on by hand to check the health of IM-OSEMS. * Just for the record for new comers: I realized PR use different amplitudes of reference signals for the LVDTs. According to labels attached to signals generators: * PR2: 6 Vpp. * PR3 and PRM: 7 Vpp. === Type-C === === Controls === === Electronics === * More two channels are not available in 1U chassis. 2U chassis are necessary with bridge cable. * Cables for the primary coils can connected to the LVDT driver directly. Signals for secondary coils are exchanged inside the chassis. == Towards O4 == * RSE Trial was finished on Oct. 13th. * Preparation work is on going. * [[https://www.dropbox.com/home/Subsystems/VIS/Inventory|Inventory sheet]]. * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/Stock|Stock record]]. * [[https://docs.google.com/spreadsheets/d/1-331CXNdqTQIudQyCTs0Eh7lumGVoY66L8XcAlNUro4/edit#gid=1191238189|Cleaning by the company]] * Monitoring for vent. Date: 19(only EYV), 22-25(practically 22-23). Charge: Miyo, Ikeda, Fabian, Takahashi * Guardian update is planed on 21 in PR and BS. * Schedule. * [[https://www.dropbox.com/s/1s5h7lb5t4ivd55/ChamberOpen-Schedule201002-1-e.pdf?dl=0|Chamber opening]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11475|VIS]] * 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. == Safety == == Discussion == == Travel Plans == The week from 10/19 * Takahashi: 10/19-23 The week from 10/26 * Hirata: 10/26-30 == Next meeting == * On 2020/10/23(Fri)