= Agenda/Minutes of the VIS Meeting on 2019/8/30 = 2019/8/30 14:00 - [[https://zoom.us/j/203743987|Zoom Meeting]] Participants: Takahashi, Hirata, Sato, Ishizaki, Lucia, Fabian, Okutomi, Fujii, Tanaka == Progress report == === Type-A === ==== Past week report ==== * general * performance test of the inertial damping was done with ETMX and ITMX. * This will be summarized by Lucia. * The simulation model for type-A suspension is now being modified from https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/VIS/SuspensionControlModel/script/TypeA/typeA_siso180517.m * Originally for my own use though. * Some channels and sensor correction paths are added. * Some of the filter name was corrected. * The updated one is in my local , is to be uploaded to SVN after renaming, adding some paths, if necessary: * /kagra/Dropbox/Personal/Fujii/TypeA/simulation/ * At ETMX * trying to tune the sensor-correction gain. Still Ongoing.[[https://www.evernote.com/l/AoMAm3SGwEZL-50TGuVxRQnXBYgpEDzOGw4/|local note]] * At ITMY * A work introducing payload damping filters is started, this work is mainly taken care by Yamada-kun. * ITMX * Attempts of WFS control demonstration with TM OpLev is ongoing. * Beside that, some missing damping filters were implemented as needed. * 46.6 Hz peak investigation * Promising mode: a higher-order mode of TM chain in pitch [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10204|klog#10204]] * On the way of damping with a band-pass comb filter * Updated the list of the modification parts in the 3D CAD model. ==== Plan for coming weeks ==== * Join to the test of WFS. === Type B === ==== Report for the week 26-08-2019 ==== * Shoda-san improved the SR3 optic pitch filter (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10152|10152]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10217|10217)]]. * For the SR3 optic Enomoto-kun implemented an integrator filter with UGF above the micro-seismic (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10014|10014]]). This filter used the oplve signal. * It works well, but it requires a set-point, which is currently set at the IM level (for IM DC control) not at the optic level. * A clear and clean implementation requires moving the set-point to the optic level and then take the error signal to the IM. * Nakano-kun modified the SR2 optic set-point to a place which is not so suitable for the oplev. We will move the QPD on Monday. * I modified the SR2 tower real-time model to allow for LVDT correction and feedforward with seismometer. * I had to modify the PEM real-time model to connect the seismometer channels to the Dolphin network. * Both models compile and I'm currently modifying the medm screen. * Performance report * There was a typhoon before the F2F meeting and this week we have had bad weather, in both cases there was an increase of the micro-sesmic activity. * During the typoon we saw a large peak at 150 mHz and this week we saw a peak a large peak at 60 mHz. * With bad weather Type B suspensions' optic motion (upper limit) were above the requirement in TM-L displacement and velocity: BS [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10046|10046]], SR2 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10052|10052]], SR3 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10056|10056]], SRM [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10067|10067]]. * Nevertheless, in days with good weather the suspensions behave mostly well in ALGNED and FLOAT states: BS [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9697|9697]], SR2 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9703|9703]], SR3 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9702|9702]], SRM [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9704|9704]]. * I also found the vertical ground motion induces motion in TM-Y and TM-P, but even with bad weather the motion remain below the requirement. * With this bad weather I was able to measure transfer functions from the ground to (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=10170|10170]]). ==== Plan for the week 02-09-2019 ==== * On Monday I will work with Yokozawa-san putting accelerometers on the SR3 oplev platforms. We will likely turn the fans off to do measurements. * We will move the SR2 tilt oplev QPD. * Real-time model: move the optic set-point to the optic level. * Update medm screens. * Shoda-san reported a coil-driver not working properly with the binary input/output. I need to check. * Test Shoda-san's fisnhing rod off-loading script with SRM sometime next week. * Terrence will be back on Wednesday. === Type-Bp === ==== Past week report ==== ==== Plan for coming weeks ==== === OMMT & OSTM (Takahashi) === ==== Past week report ==== * Dummy mirror was delivered. * Ordered the spacer plate and the connector plate. ==== Plan for coming weeks ==== === VIS electronics === ==== Past week report ==== ==== Plan for coming weeks ==== === Other site works === === Safety === * Incidents: == Discussion == === VIS repair/upgrade work between O3 and O4 === * The list is required by the SEO. They need it for scheduling and arrangement of the site works between O3 and O4 considering the task of all subsystem. * One more week was added to the period for EYV work. * Recovering of the FRs includes the adjustment of ballast masses. Though needed period depends on the situation, two more weeks were added for each SR3/BS work. * Installation of the yaw FR for BS includes the replacement of bearing. * The re-gluing of the IM/TM magnets was omitted. * Replacement of the ferromagnetic parts on SF in BS/SR3 was added. * Expenses will be covered by the 2019FY budget. Spare connectors are included in the budget. * Optional * Improvement of the FRs with limiter switch. * Improvement of the ACCs. --> To base plan. * Connector supports for the assembled in-vac cables. * Replacement of the LVDT cards. * Replacement of the LVDT-actuator units in BS. * Small items * Tuning of BS IP by small ballast. * Flip connections in BS IP H2 coil actuator. * Replacement of the chipped magnets (12x12x12 mm) for IP in SR3 * Moving of the electronics to small rack in SR3. * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10674|List for SEO]] * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/BrainStorm/ToDo2019|Brain storming page]] ==== Comments from the site workers ==== * It seemed that the proposed schedule did not include the integration period (a period after the hardware installation, before starting the interferometer work, i.e., suspension commissioning work YF guess). * It would be better to have a slot to consider the feasibility and robustness of the schedule so on, more seriously, with VIS folks. == Travel Plans == * Travel (Week of 9/2): * Takahashi: * Sato: * Hirata: * Shoda: * Fujii: 2-6 * Tanaka: * Travel (Week of 9/9): * Takahashi: * Sato: * Hirata: * Shoda: * Fujii: 9-13 * Tanaka: == Next meeting == On 2019/9/6(Fri)