= Agenda/Minutes of the VIS Meeting on 2016/11/11 = 2016/11/11 13:30 - Participants: Shoda, Kasuya, Akutsu, Mark, Hirata, Okutomi, Aso, Fujii, Sato, Ishizaki, Tanaka, Ohishi, Enzo, Raffaele, Takahashi == Progress report == Schedule Chart ([[https://www.dropbox.com/s/2q2elzj6s4lep6r/VIS%20Overall%20Schedule-20161014.pdf?dl=0|PDF]],[[https://www.dropbox.com/s/kwo9bxfb2711jkx/VIS%20Overall%20Schedule-20161014.mpp?dl=0|MPP]]) '''To Be Updated''' === Type-A (Takahashi) === * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/TypeA/Meeting|Minutes of Type-A Meeting]] * Installation: Asking a company the cost and schedule for transportation of Type-A items from the center area to the 2F of Y-end. * Pre-isolator: Assembly work will be concentrated to the next week. The PI for SRs will be transported on 21st from Akeno. 5 ACCs were measured at the site. * EQ stop, release sensor, dummy payload: Production is on going. * BF damper: Open bidding was on 9th. A production company was decided. * Maraging wire: Asking the company a quotation. The company is checking procurement of the material. === Type B (Mark) === * Type B Past Week Summary * Mark and Hirata-san at Mitaka * Gathered parts for cable making. * Mark and Hirata-san at Kamioka: * Replaced the floor panels that had been taken from the PR2 area (filling in the hole in the floor) and found/installed two new panels to act as bridges near the BS assembly frame. * Installed two more LPCDs and the stepper motor driver in the PR2 rack. * Ran cables from the rack to the second and third sat amps (for the IRM OSEMs). * Added a second DIO card in the rack and connected it to the BIO inputs and outputs of the new LPCDs. * Started making extension cables for RM-H2 and -H3 OSEMs but gave up due to complicated grounding arrangement. * Washed four 40-cm D-Sub-9 ribbon cables to use as temporary extensions (maybe also for H1/H4). * Added extension to the IM pico cable for the BF yaw pico. * Made LVDT adapter cable. * BS mirror box was shipped back. * Mark worked on schedule. === Type-Bp (Shoda) === * Ordering New flags, OB related parts, and the assembly frame were ordered. We are now asking the delivery time. * Flag removing jigs The parts for the jigs are delivered at Mitaka. Some parts are passed to Fukushima-san for machining. * TM OSEM flag We found the one of the TM OSEM flags are detached from the mirror when we opened the vacuum tank. Since TFs that Fujii-kun measured were not weird, it seems to be detached after the measurement. (Will be reported next week again.) * The clump plates for IM may have to be re-manufactured. The current ones have pressed lines by wires. === IMMT (Ohishi) === * Put a report here === Watchdog system (Tanaka) === * Schematic and PCB design[[http://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0057/E1605760/002/Project_WDS_PCB_Design_Ver1-161110.pdf|JGW-E1605760-v2(PDF)]] * Wearing a terminating resistor(for OSEM sensor deferential out) on both sides. And the value of terminating resistor is changed from 3k to 30k. * Design and preparation(investigation of procurement) for production.[[http://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0057/E1605791/004/Project_WDS_H_W_Assignment_Design_Ver1_0-20161111.pdf|JGW-E1605791-v4(PDF)]] === Safety === * Incidents * A strong incandescent light was put close to the plastic sheets of the clean booth, which is probably flammable. * A temporary pillar in the PR clean booth near MCF came off when people moved the coach filters and hit it. * Foreseen risks * Type-B team will lift the suspension system from the BF to measure the weight. Mark will write up a procedure and circulate to the VIS people. * Type-A team will continue the assembly of the PI. A crane work to combine the IP and TF is foreseen. Make sure to have at least two people doing the work. == Discussion == * JPS/ASJ meetings * VIS overall talk: Takahashi (JPS) * TYpe-A: Okutomi (JPS) * Type-B: Mark (JPS) * Type-Bp: Shoda (JPS) * Fujii may present his data analysis work at ASJ * PR3 accident * What happened * When the suspension system was put back to the assembly frame, the position and height of the IM was not correct. * During the adjustment process of the IM position, the mirror moved too much in roll. * The mirror slept out of the wires and hit the mirror box (MB) * MB and the recoil mass (RM) moved on the rail by the shock creating a gap between them. * The mirror fell in the gap between the MB and RM. * What was wrong * Mechanism * The assembly jigs were designed only with the assembly procedure in mind. Disassembly was not taken into account at the time. * Insufficient adjustment mechanism of the IM position. * Long rod from the mirror box interfered with the work * No slit on one wire breaker * Base for the RM is not fixed. RM was not fixed to the base. * MB base and the RM base were not connected together. * Procedure * Did not review the disassembly procedure beforehand. * Adjustment of the mirror position should have been done while the mirror is inside the RM. * Adjustment of the mirror position took 2 hours. People got tired. * Organization * There was only one expert in the team. Should have had at least two. * The allocated time for the PR3 disassembly was too short. * Communicating in English while doing a complicated assembly work was difficult. * Needed to take more rest. * We will discuss on how to solve the technical problems as well as increase the overall safety of the VIS works in the future at the next meeting. * Shoda will write a report on this accident: What happened, What was wrong, and what are we going to do. == Site work plan for the next week == * Mon: * Tue: * Wed: BS * Thu: BS * Fri: BS == Travel Plans == * Travel (Week of 11/14): * Takahashi: * Shoda: * Mark: 16-18 * Fabian: * Okutomi: * Fujii: * Ishizaki: * Hirata: 16-18 * Sato: * Enzo: 16-18 * Ohishi: * Travel (Week of 11/21): * Takahashi: 21 Akeno * Shoda: * Mark: * Fabian: * Okutomi: * Fujii: * Ishizaki: * Hirata: * Sato: * Enzo: * Ohishi: == Next meeting == On 2016/11/18(Fri) in Mitaka VIS F2F: Nov. 18, Dec. 2