<> = Agenda/Minutes = [[https://zoom.us/j/203743987|Zoom Meeting]] ---------- = CRY+VIS Interface Meeting = Date: 2021/10/22 13:00-13:20 Participants:　Takahashi, Ikeda, Yasui, Uchiyama, Yokozawa, Hirata, Sato, Aso, Kimura, Ushiba [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] == Schedule == * IX: Health check. BF actuator. * EX: Health check. HPCD. BF damper (V). * IY: LVDT driver. Cable check. * EY: F0 FR range. Weight on PF. == Status == * TM height setting: ITMY * Oplev: Wind shields were installed to the IXC and EXC. * ACC: Ready to install to EX. Measurement for IY is necessary. * 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: 2021/10/22 14:00-14:35 Participants: Takahashi, Fabian, Miyoki, Uchiyama, Hirata, Ishizaki, Ushiba, Terrence, Sato, Tanaka, Sugiyama == Summary Report == === Type-A === * Range of F0 FR in EY was expanded from +/- 0.4mm to +/- 0.9mm. === Type-B === * SRM: We measured the mirror height with respect to Tomaru-san's new marking of the expected beam height. * It is 2.8 mm below. This is ~1.5 turns of the jacks. * We should try raising it with the jacks next week. * SR3 and SR2: We doubled checked previous measurements. === Type-Bp === ==== PRM ==== According to Tomaru-san's measurements of the chamber height with respect to the BS, it is necessary to lower the suspension by 6.3 mm. We checked whether this is possible using the SF keystone: * It seems possible, however, we need to do additional work becuase a couple of cables touch the security structure after a displacement of 3.3 mm. * We think we can fix this problem by doing the following: * Modify one of the L-shaped security structure stops around the BF and * Add a cable clamp underneath the BF; there is an unused M6 threaded hole next to the cables. * See pictures in klog [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=18638|18638]]. * For the sake of checking, we lowered the SF keystone from the setpoint by approximately 7.3 mm and nothing else semeed to touch the security structure. A RM coil cable came very close to do it, but we can modify the security structure easily. ==== PR3 ==== Hirata-san finished the design of the SF keystone ballast mass base plate. We will proceed as soon as we have the new components. === Type-B and Type-Bp height report === See Fabian's slides. === Type-C === === Electronics === === Control === == Schedule == See [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Schedule|Schedule]] * Type-A team: LVDT driver in IY. HPCD and BF damper in EX. * Type-B team: Mirror inspection (Hirata-san), raise SRM, fix SRM IP LVDTs, it depends on the conclusions of the Tuesday meeting. == Safety == == Discussion == Terrence: My plan at KAGRA. [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=13379|Presentation file here]] == Travel Plans == (Date in Kamioka) The week from 10/25 * Takahashi: 10/26-29 * Sato: 10/26-29 * Hirata: 10/26-29 * Fabian: away on Monday and Tuesday due to vaccination. The week from 11/1 * Takahashi: 11/1-2 * Hirata: 11/2-5 == Next meeting == * 2021/10/29(FRI)