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| * After a verbal report from Lucia last week I checked the condition of SR2: the control system couldn't bring the IP to its set point (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14381|14381]]). * On Monday Lucia and I came to the site. * We realized coil-magnet actuation didn't move the IP but horizontal fishing rods did, so we suspected the electronics or cabling. * With Yamamoto-kun we went to the tunnel and realized the HPCD had broken down (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14394|14394]]). * Thanks to Tomura-san's quick reaction we got a new HPCD and recovered the IP and the suspension (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14395|14395]]). * I don't know what's the origin of the failure. It wasn't an actuation overload due to an earthquke because there was no earthquake (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14407|14407]]). * A similar event happened to the BS IP on the 5th of May (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14404|14404]]). * I have been measuring decay times of the SR2 suspension on Thursday and Friday from the control room (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14413|14413]]). There are no final results to show yet. * I asked a few elementary questions about inertial damping (questions [[https://www.dropbox.com/s/g1q38sgbgocthbu/Inertial_damping_questions_fabian.pdf?dl=0|here]]). Thank you very much Takahashi-san and Terrence for their answers! :D === Type-Bp === === Type-C === * Making the 3D model of IMMT2 suspension. === Controls === * Summarizing the GUARDIANs. === Electronics === * Ordered the parts for test and prepare for the test. == Post O3 == * KAGRA is in the suspended mode until 31st May. * Only measurements, which can be done remotely, are available ([[https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit?usp=sharing|Request]]). * O3c is still under discussion between LVK ([[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]], [[https://www.dropbox.com/s/hoadb73fdyah02c/Post-O3%20task.xlsx?dl=0|Sheet]]). * The site work towards O4 will be started from July at earliest. == Safety == == Discussion == * Submission to JPS/ASJ Meeting. * JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun. * ASJ Meeting: 8-10 Sep. Online, Deadline: 9 Jun. * Report "KAGRA observation run: performance of the Type A suspensions" (Check the attached file in kagra-seis). == Travel Plans == == Next meeting == * On 2020/5/29(Fri) |
* After a verbal report from Lucia last week I checked the condition of SR2: the control system couldn't bring the IP to its set point (klog entry [[http://klog.icr |
Agenda/Minutes of the VIS Meeting on 2020/5/22
2020/5/22 14:00 - 15:20
Participants: Takahashi, Hirata, Fabian, Miyo, Sato, Shoda, Aso, Lucia, Tanaka
Progress report
General
Type-A
Type-B
After a verbal report from Lucia last week I checked the condition of SR2: the control system couldn't bring the IP to its set point (klog entry [[http://klog.icr