Agenda/Minutes of the VIS Meeting on 2016/10/7

2016/10/7 13:30 -

Participants: Takahashi, Tanaka, Fabian, Hirata, Mark, Aso, Fujii, Ishizaki, Sato, Akutsu

Progress report

Schedule Chart (PDF,MPP)

Type-A (Takahashi)

• Minutes of Type-A Meeting

• Pre-isolator: IPs and TFs were transported from Akeno to Mitaka on 3rd. One set of IP and TF were brought in the clean room.
  • Top filter was found damaged: a screw came out apparently from the vibration during the transportation.
  • We don't know when this happened. We will check the screws before transporting the remaining TFs from Akeno to Mitaka.
  • Spare parts to fix the broken part are available.
• EQ stop, release sensor, dummy payload: Production is on going.
• Bottom Filter: Assembly of the second BF is on going. SUS bearings were ordered.

• BF damper: Asking a quotation to a company. The test report of LVDT prototype was uploaded (report).

• Maraging wire: We concluded that the load to the maraging wires during crane operation is small enough to keep less than 2G.

Type B (Mark)

• Type B Past Week Summary
  • Fabian, Mark and Liu-kun did BS installation at Kamioka:
    • Connected the DIO card to the LPCD. (Simulink model changes will be needed to make use of it.)
    • Took TF data from the TM-H1 coil output to the voltage and current monitors and found that the response was approximately flat, meaning that meaningful TFs can be taken of the RM/BS stage with no DIO.
    • Used the 90° prism and the optical lever to set the pitch of the RM to match the dummy BS.
    • Removed the RM trolley and added the bottom section of the security structure.
    • Lifted the IM/RM/BS with the load gauge adapter and load gauge and measured its mass.
  • Hirata-san:

    • Modified drawing of maraging rods for BS D1605706

    • Made 3D models of stub flag gluing jigs.

    • Made 3D models and 2D drawing of BS BF-IM hexagon cable clamp assembly and cone parts. D1605734

    • Washed parts and screws.
    • (For Type A) Assembled and adjusted blades of BF #9.
  • Mark checked lots of drawings by Hirata-san.
  • Mark worked on schedule but only succeeded in completely garbling the Type B section of the VIS schedule on the server.
• Longer term to-do list
  • Do Inventor assembly for SRx in chamber and on assembly frame (Hirata) - SR2/SR3 DONE, SRM ongoing.
    • Part "disk security" top has to be modified - screw positions do not match.
  • Write more of payload assembly procedure (Fabian) - ONGOING

  • Write more of BS Assembly Procedure E1504235, E1504235 draft (Mark) - ONGOING

  • Lower breadboard installation to be incorporated into the procedure document.
  • Work on BS simulation (Fabian)
  • Do BS Simulink model (Mark, Kokeyama) - TM/IM/BF level DONE
  • Do 2D drawings of SR2 parts (Hirata)
  • Redesign SRx IM wire clamps for larger prisms, remachined RMs
  • Order SRM/PRM parts (Hirata/Shoda)
  • Order SRx fasteners (Hirata)

Type-Bp (Shoda)

• Modification Parts
  • I asked the ICRR desk to make an announcement for the open estimation. The call for cost estimation is announced today.
  • The result will be open on the beggining of the November.
  • The delivery date of the whole the parts will be in January. But I asked the possible companies to give us 1 set earlier. (I heard that it would be possible within this year.)
• Mirapro
  • Hirata-san updated the wire design and hook design. Some other parts only used for Type-Bp should be also updated.
  • How to order is under discussion.
• BFRM wires
  • Takahashi-san will make an order soon.
• Mirror preparasion
  • Discussion about the jigs for removing the current flags from the PR3 and spare mirrors are ongoing with Hirose-san. (No progress this week.)
• Flags
  • Hirata-san made the models. Checked and ordered soon.

IMMT (Ohishi)

• No progress this week.

Watchdog system (Tanaka)

• Finished the schematic design. Start working on the PCB design.

Safety

• No issue.

Discussion

• Maraging and SUS rod issue follow up.
  • Type-B Maraging rods: design is ready. Will be ordered soon (Takahashi)
  • SUS rods: design is ready. Will be ordered with the PR assembly frame (Takahashi/Shoda)
  • Type-A Maraging rods
    • Installation procedure review concluded that the rods will not get tension above the static load during installation.
    • We employ the safety factor of 2 as requirement.
    • Takahashi will explain this and ask Obuchi-san to re-optimize the shape after the meeting.
      • Neck diameter can be increased to keep the safety margin

      • We want to keep the nail head diameter <= 8mm as much as possible.

      • Takahashi will ask Ojima whether 9mm nail head is possible or not just in case we need to increase the nail head size.
• IM OSEM noise issue (Shoda)

  • Slides

  • We need to tune the filters for length and yaw to reduce the noise coupling.

Site work plan for the next week

• Mon: Holiday
• Tue: BS test hanging/Extended Chief Meeting
• Wed: BS test hanging/Accelerometer test
• Thu: BS test hanging/Accelerometer test
• Fri: BS test hanging/Accelerometer test

Travel Plans

• Travel (Week of 10/10):
  • Takahashi: 11 -14 (Extended Chief Meeting/Accelerator check)
  • Shoda:
  • Mark: 10-14
  • Fabian: 11-14
  • Okutomi: 13 -14 (Extended Chief Meeting/Accelerator check/FE code development)
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato: 12 -14 (Extended Chief Meeting/Accelerator check)
  • Ohishi:
• Travel (Week of 10/17):
  • Takahashi:
  • Shoda:
  • Mark: 17-21
  • Fabian: 17-21
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato:
  • Ohishi:

Next meeting

2016/10/14(Fri) 13:30 - VIS F2F: Oct. 28, Nov. 18, Dec. 2