= Agenda/Minutes of the VIS Meeting on 2019/6/21 = 2019/6/21 13:30 - 14:38 [[https://zoom.us/j/203743987|Zoom Meeting]] Participants: Terrence, Fabian, Takahashi, Hirata, Sato, Mark, Shoda, Fujii, Aso, Okutomi, Tanaka, Ishizaki == Progress report == === Type-A (Takahashi) === ==== Past week report ==== * Checked stock parts. * Sent back a spare ACC unit to Mitaka for developments. ===== News ===== * ITMY * we decided to go with current configuration for the time being. * ETMY * During a measurement, YF kicked IP accidentally and the orientation of ETMY went away. * Everything should be free now since BFYexc and MNexc transfer functions looked consistent with the ones measured before this kick. * Only the orientation was changed somehow. * We decided to open the chamber. The cryocooler was turned off already. * During another measurement. it was found that F3-GAS was working properly at the current position ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9293|klog#9293]]). * since the shapes of the GAS mechanical transfer functions were changed from the precious ones, I updated the modeled transfer function and filters in the filter-bank. ===== Building damping system for payload ===== * ITMX / ETMY * I started to measure the mechanical transfer functions with Photo-sensors for building. * ETMY-MN/IM * 6dof, done. Sensor/actuator diagonalization is necessary indeed. ===== RT-model, MEDM, guardian updates ===== ==== Plan for coming weeks ==== * Modify/install RT-model * update MEDM, guardian * tune the filters === Type B (Mark) === ==== Past week report ==== ==== Report for the week 6/17 (written by Fabian) ==== * Izum-san pointed out the SR3 oplev control loop was not able to damp resonances at 1.4 Hz and 1.2 Hz (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9290|9290]]). Terrence checked (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9299|9299]]): * He found that the optic TFs were coupled to about 10%. I assume something changed because, as far as I understand (Fabian), the oplev had been succesfully diagonalized before to less than 1% coupling. * He moved the IP and compared IP LENGTH with OPLEV LENGTH noting the the oplev was reading only 70% of the IP displacement. * In this conditions he diagonalized the oplev but failed. There was still coupling. * He introduced a factor to have the OPLEV LENGTH measurement equal to IP LENGTH measurement. * He successfully diagoinalized the oplev. * He then proceeded to checked the filter but he was unable to reduce the residual motion. Noise is the suspect. Having appropriate wind shield is recommended. * Fabian worked in rolling-off the control filters of the GAS filters. * According to klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=8979|8979]] the GAS filter control noise has to decrease by 5 orders of magnitude in order to meet the requirement at 10 Hz. * A Butterworth filter of order 20 with a cut-off frequency of 5 Hz seems to reduce the noise but renders the system unstable. * More work is necessary. * Fabian joined Enomoto-kun's lecture on how to align the X Fabry Perot cavity with green light. * VIS simplified monitor is available. [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9298|9298]]. ==== Plan for the week 6/24 ==== * Fabian will continue working in the rolling-off of the filters of the GAS filters control loops. * Improve VIS monitor * Help commissioning ===== Leftover ===== * Lock filters for gound motion common-mode rejection. * SR3 inertial damping, windshield. * Type B operation manual. ==== Vacation/Travel Info ==== * Terrence goes back to Hong Kong on 7/27. * Mark's final day 6/28. === Type-Bp (Shoda) === ==== Past week report ==== ==== Plan for coming weeks ==== === OMMT & OSTM (Takahashi) === ==== Past week report ==== * Checked stock OSEMs. There are 17 units. * Disassembled the pillars of the MC suspension for modification. * Ordered the modification parts. * Making the overall 3D model around OMC. ==== Plan for coming weeks ==== * Schedule([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10364|PDF/MPP]]) === VIS electronics (Tanaka) === ==== Past week report ==== ==== Plan for coming weeks ==== === Other site works === === Safety === * Incidents: * Foreseen risks * Type-A: * Type-B: == Discussion == === DAQ channel reduction === * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10294|List]] === Realtime model update policy === * Make local copies of the relevant files (.mdl, MEDM files etc) to modify an existing RTM. * Once the modifications are complete, you can deploy the modified files by replacing the existing ones. * Notify the relevant people (kagra-seis and gokagra ML) in advance (more than a day) of the deployment of the modified RTM. * Deployment should be complete. * Do not attempt a partial update, such as changing only ETMX. Update all the suspensions of the same kind (Type-A, B, Bp) at once, unless there is a good reason to do so. * Update MEDM screens at the same time to reflect changes in the RTM. * People can test the modified RTM during non-interferometer-commissioning time, i.e. in the morning. * After the test, the RTM should be reverted to the original one, before the interferometer commissioning starts. === Where to put the hardware WDS ? === * Type-Bp: GAS LVDT ? * Type-B: IP ? * Type-A: IP ? === POS table cover box === * [[attachment:Box-with-panel.pdf]] * [[attachment:Box-without-panel.pdf]] * [[attachment:Explanation.docx]] == Travel Plans == * Travel (Week of 6/24): * Takahashi: * Sato: * Mark: * Hirata: * Shoda: * Fujii: 26-28 * Tanioka: * Tanaka: * Terrence: * Travel (Week of 7/1): * Takahashi: * Sato: * Mark: * Hirata: * Shoda: * Fujii: 1-4 * Tanioka: * Tanaka: * Terrence: Fujii: Amaldi 7/6-14 == Next meeting == On 2019/6/28(Fri)