<> = Agenda/Minutes = [[https://zoom.us/j/203743987|Zoom Meeting]] ---------- = CRY+VIS Interface Meeting = Date: 2021/10/15 13:00-13:25 Participants: Takahashi, Hirata, Miyoki, Yasui, Ikeda, Ushiba, Uchiyama, Yokozawa, Sato, Node [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] == Schedule == * IX: Health check. F0 behavire. * EX: Health check. * IY: (LVDT driver. Cable check.) * EY: H4 geophone. F0 FR. Height adjustment. LVDT driver. IP position. Insulator repair. == Status == * TM height setting: ITMY * Commissioning in air: Health check. * Commissioning in vacuum: * Overall commissioning: * Acceptance check: * PF actuator: At the in-vacuum commissioning. * New vacuum pumps for V-chambers: Under the bidding process. * Heater control: To PRs in the next. == Discussion == ---------- = VIS Meeting = Date: 2021/10/15 14:00-14:40 Participants: Takahashi, Ushiba, Ishizaki, Hirata, Uchiyama, Sugiyama, Terrence, Fabian, Miyoki, Tanaka, Sato == Summary Report == === Type-A === * EY: Installation of the H4 geophone. Modification of the F0 FR. Height adjustment with the jacks. Replacement of the LVDT driver for IP. Adjustment of the IP position. * IX: Repair of the cable connection in F0. === Type-B === * BS: We tested the robustness of the outer frame * Resolution of the dial gauge: 0.01 mm. * Weight added to the frame: ~71 kg. * '''Corner (-X,-Y) : -3 um ''' * '''Corner (-X,+Y): -10um''' * '''Corner (+X,+Y): it didn't seem to move much.''' * '''Corner (+X,-Y): -8 um''' * SR2: The geophone theoretical noise was calculated (shown in this meeting last year also). '''The noise is higher than expected.''' * SR3: The geophone theoretical noise was calculated. * '''Below 500 mHz, the calculated and measured values seem to coincide. ''' * As far as I remember being told, these geophones have been very noisy after installation on the IP table. I need to measure the IP free swing displacement ASD on a day with low micro-seismic in order to compare. === Type-Bp === * SR2: We fixed the BF picomotor cable. * PR3: * On monday we moved the V1 OSEM within range. We left it at ~9940 cnt. Although I don't expect this to happen, let's see if the OSEM remains in range after the next eathquake. * We assesed whether is possible to lower the SF keystone by 5.2 mm: it seems possible. * The concern was cables underneath the BF touching the security structure ring, but there are functional gaps after we lowered it. * First we moved the keystone using the lock screws, but later we used 405 grams. * Lowering the SF yoke-coil assembly might damage cables around, but I guess we can fix them if such a thing happens. * It's better to add mass on the keystone rather than on the BF. Hirata-san has designed an adapter. === Type-C === * Unification of the coil name notation (H1, H2, ..) was suggested. === Electronics === === Control === == Schedule == See [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Schedule|Schedule]] * Type-A team: From the satellite room in Mitaka. * Type-B team: Geophone noise, IP LVDT. == Safety == == Discussion == == Travel Plans == (Date in Kamioka) The week from 10/18 * Hirata: 10/19-22 * Yano: 10/18-22 The week from 10/25 * Takahashi: 10/26-29 * Sato: 10/26-29 * Hirata: 10/26-29 * Yano: 10/25-29 == Next meeting == * 2021/10/22(FRI)