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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 (PDF,MPP) To Be Updated

Type-A (Takahashi)

• 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 designJGW-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.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