= Agenda/Minutes on 2020/11/13 = [[https://zoom.us/j/203743987|Zoom Meeting]] = CRY+VIS Interface Meeting = 13:30-13:50 Participants: Takahashi, Hirata, Ikeda, Hagiwara, Aso, Yano, Kimura, Sato, Ushiba * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] * Disassembly of the Type-A tower was finished in Y-end (11/11). Evacuation of IYC will be started on 11/18. * Schedule: Wire disconnection (IX 11/13, EX 11/19), Chamber evacuation (IY 11/20). * Jig for the FC painting: Hirata-san made the 3D model of jigs for SR and BS. * PF actuator: Measurement of coefficients --> calculation of the noise (by mid Dec.). = VIS Meeting = 14:00-15:00 Participants: Takahashi, Hirata, Aso, Yano, Sato, Fabian, Washimi, Terrence, Tanaka, Sugiyama == Progress report == === General === === Type-A === * Disassembly of the Type-A tower was finished in EY (11/11). * The wire for the cryo-payload was disconnected in IX (11/13). === Type-B === With Washimi-san. * We inspected the BS BF in order to decide the size of a SDC M6 screw to buy. Hirata-san ordered a few (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15435|15435]]). * We connected the cables for the SRM OSEM and the IM picomotors. An adapter for the IM picos broke and I borrowed from SR3 for now. * As preparation we turned on the optic fibre camera and realized it's missing a microSD card. Takahashi-san ordered one already. * I reported to Yokozawa-san that the temperature in SRM was about 21.8 degrees Celsius. We need it warmer next week. * SRM new problem: F1 fishig rod jammed at the lower end of its range. See klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15447|15447]].<<BR>> * Some FRs don't jam when reaching the end of ther ranges, but others do. * The expeced position of the keystone at 23 degrees in vacuum is -980 um (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15461|15461]]), which is likely too large to bring the keystone to zero with the coil-magnet actuator. * What to do? Following our current line of thought, we should remove mass from the BF. Another option would be: * Hope fo the best next week and fix the BF. * Leave the SF wherever it lands (at -980 um presumably), * Set the BF at zero and * Compensate the height of the mirror with at the F0 keystone or the IP jacks (better). * Recovery of SRM still continues: I need to check why IM-Y is about -3 mrad whereas it should be close to -65 urad. Unfortunately we don't have the oplev for visual inspection of the beam.See klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15463|15463]]. === Type-Bp === Washimi-san, Akutsu-san, Miyo-kun, Sugiyama-san, Fabian. * After Shimode-san fixed a minor problem with one of PR2 LVDT drivers, we installed it back and it worked! * We measured the phases again. The results of almost all LVDT drivers used in PR suspensions are reported in klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15457|15457]]. * PRM BF recoil mass LVDT cards have not been examined because we need the problem with the misconnected cables solved. * One resistance in PRM SF GAS LVDT channel seems anomalous: it's value is only 1.2 Ohm whereas typical values are larger than 5 kOhm. * PRM oplev breadboard with optics was installed on the pylon. They will turn the SLED on next week. See klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=15449|15449]]. === Type-C === * [Sato](no progress) === Controls === === Electronics === * The circuit boards for new combiner prototype were delivered. The circuit parts have not yet. * Considering the mass production of new combiner using ICRR/NAOJ budget. * No stock of Murata inductor in the market. * We asked AEL to modify 16 LVDT cards (AD630 grounding and on-board D-sub connectors). == Towards O4 == * Type-B remedy work will be started on 11/16. * Schedule. * Arrangement of personnel in Nov. ([[https://www.dropbox.com/s/ow2fvqozua9vghi/VIS%20schedule%20Nov.xlsx?dl=0|table]]) * [[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 11/16 * Takahashi: 11/16-20 * Sato: 11/16-20 * Hirata: 11/16-20 The week from 11/23 * Aso: 11/24-27 * Takahashi: 11/24-27 * Hirata: 11/24-27 * Sato: 11/24-27 == Next meeting == * On 2020/11/20(Fri)