<> = Agenda/Minutes = [[https://zoom.us/j/203743987|Zoom Meeting]] ---------- = CRY+VIS Interface Meeting = Date: 2022/4/15 13:00-13:50 Participants: Aso, Ushiba, Tomaru, Akutsu, Kimura, Ikeda, Miyoki, Takahashi, Sato, Hirata [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] == Schedule == * IX: F0 overload * EX: * IY: Health check. Go to finalization (WAB, Frame adjustment). * EY: TM actuator problem (flip cable, regluing of magnet). * Type-B/Bp/C: BFH LVDT was recovered in PRM. Power supply trouble was due to the broken cooling fan. Leak in the IMC chamber was recovered. == Status == * Replacement of flip cables: Cables for TMS were ordered. Feedthrough flange was replaced with the blank flange in OMC. * TM height setting: ITMY. * Oplev: Calibration results were summarized. Windshield in the next. * ACC: Investigating the noise source. * Commissioning in air: * Commissioning in vacuum: Alignment of the MCE and the X-arm is scheduled in the next week. * Acceptance check: * PF actuator: At the in-vacuum commissioning. * New vacuum pumps for V-chambers: * Heater control: Test is pending. * TMS: Pressure fluctuation was due to the valve operations. Two vacuum gauges were broken. == Discussion == ---------- = VIS Meeting = Date: 2022/4/15 14:00-14:30 Participants: Takahashi, Ushiba, Fabian, Washimi, Tanaka, Uchiyama == Summary Report == === Type-A === * Recovery of the TM actuator in EY. * Saturation of the F0 keystone height. === Type-B === Nothing === Type-Bp === * We replaced a broken LVDT in PRM. Namely, the one for the BF Damper horizontal LVDTs: * In the old board, we measured the resistance values determining two gains, and copied them into the new board. * After installing the new board, we adjusted the phases in order to achieve maximum output. * Then, in order to calculate the new LVDT calibration factors, we measured the transfer functions from Y actuation to H1, H2 and H3 outputs, and compared with previous measurements. * The DC amplitudes and phases of transfer functions are the same as before. * Hirata-san continued working in the design of the Traverser limit switches. Differences between the real hardware and the 3D-CAD have made the process difficult, but he's now working on a final version. He has reported his work at the ATC-KAGRA meeting. * Takahashi-san realized that the LVDT drivers used in PR3 and PRM are using a reference signal with an amplitude of 12 Vpp. === Type-C === * Replaced the feedthrough flange with the blank flange in OMC. === Electronics === === Control === == Schedule == See [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Schedule|Schedule]] * Type-A team: Finalization in IY. * Type-B team: SF FR grounded problem in SR3. == Safety == == Discussion == == Travel Plans == (Date in Kamioka) The week from 4/18 * Takahashi: 4/19-22 * Sato: 4/19-22 * Hirata: 4/19-22 The week from 4/25 * Takahashi: 4/25-28 * Sato: 4/25-28 * Hirata: 4/25-28 == Next meeting == * 2022/4/22(FRI)