<> = Agenda/Minutes = [[https://zoom.us/j/203743987|Zoom Meeting]] ---------- = CRY+VIS Interface Meeting = Date: 2021/11/26 13:00-13:40 Participants: Takahashi, Uchiyama, Yasui, Sato, Aso, Ikeda, Kimura, Ushiba, Tomaru, Akutsu, Hirata, Yokozawa, Miyoki [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Upgrades/PostO3Upgrades|Post O3 Upgrade portal]] == Schedule == * IX: Finalization of cryo-payload. It will be finished on 11/26. * EX: Finalization of cryo-payload. It will be finished in early next week. Installation of ACCs. Replacement of flip cables. * IY: * EY: Some problems were found on the actuators. == Status == * Replacement of Flip cable: EX in this week. IX in the next week. * TM height setting: ITMY. * Oplev: Setup of the TM Oplev in IY after the TM alignment. * ACC: Installed to EX on 11/24-25. Assembly for EY is ongoing. * Commissioning in air: GRY. * Commissioning in vacuum: Chamber closing is scheduled from 12/13. * Overall commissioning: * Acceptance check: * PF actuator: At the in-vacuum commissioning. * New vacuum pumps for V-chambers: 11/24 in IXV. * Heater control: * Power source for Oplev: The next target is IX. == Discussion == ---------- = VIS Meeting = Date: 2021/11/26 14:00-14:30 Participants: Takahashi, Ushiba, Hirata, Fabian, Uchiyama, Sato, Aso, Ishizaki, Tanaka, Terrence == Summary Report == === Type-A === * Installed the accelerometers to EX. * Replaced the flip cables in EX. === Type-B === ==== About the BS F1 LVDT problem ==== * We identified a place to mount the optical displacement sensor for calibrating the LVDT. * The sensor use an area on the BF cap free of ballast masses and cables. * It should be held from the pillar of the security structure. '''Hirata-san and I already have a plan'''. We'll use some components from Thorlabs and a couple of new pieces. * Takase-san finished making holes to electronics adapter box. * I did an experiment and it increased the SNR by a factor of 21. * Yesterday we covered the flanges of the SR2 and BS chambers and turned the Koach filters off, so today I quickly checked whether the moving peak in F1 LVDT spectra was still there: it is. ==== SR2 ==== * Derived OpLev calibration factor from old calibration data [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=18980|https://klog.icrr.u-tokyo.ac.jp/osl/?r=18980]] * Derived OpLev Sensing Matrix from old distance measurements [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=18993|https://klog.icrr.u-tokyo.ac.jp/osl/?r=18993]] * Oplev readouts show agreement with IP readouts to 10-20%. * Diagonalization. Cross-couplings are all around/below the 1% level [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=18994|https://klog.icrr.u-tokyo.ac.jp/osl/?r=18994]] * IM H1 cable was disconnected from the flanged. Fabian plugged them back. [[https://klog.icrr.u-tokyo.ac.jp/osl/?r=18996|https://klog.icrr.u-tokyo.ac.jp/osl/?r=18996]] * I measured all transfer functions and I have modeled them this morning (klog pending) * I will update the control filters and test them next week. === Type-Bp === === Type-C === === Electronics === === Control === == Schedule == See [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Schedule|Schedule]] * Type-A team: Finalization of IX and EX. Recovery of actuators in EY. * Type-B team: SR2 control system. TF LVDT in BS. Replacement of flip cables in BS. == Safety == == Discussion == == Travel Plans == (Date in Kamioka) The week from 11/29 * Takahashi: 11/30-12/3 * Sato: 11/30-12/3 * Hirata: 11/30-12/3 The week from 12/6 * Takahashi: 12/7-10 * Sato: 12/7-9 * Hirata: 12/7-10 == Next meeting == * 2021/12/3(FRI)