Agenda/Minutes of the VIS Meeting on 2016/9/16

2016/9/16 13:30 - @ Room 210

Participants: Mark, Fabian, Hirata, Takahashi, Sato, Ishizaki, Tanaka, Okutomi, Raffaele

Progress report

Schedule Chart (PDF,MPP)

Type-A (Takahashi)

• Minutes of Type-A Meeting

• EQ stop, release sensor, dummy payload: Open bidding was on 13th. Meet with the company person on 16th.

• Bottom Filter: Assembly of BFs was started on 7th. Some of bearings washed previously were rusted. -> ordered new parts.-> Will buy more to prepare for replacing bearings in the existing BFs. (Takahashi).

• BF damper: Specification document will be prepared with the drawings soon. Test of LVDT prototype is on going.
• Maraging wire: Asking new design around head to ATC. Tensile test is in preparation.
• Foot hold: Considering the type used in ATC, which is ready made and folded.

Type B Past Week Summary

• Type B Past Week Summary
  • Fabian, Mark, Yokogawa-kun and Kuwahara-kun did BS installation at Kamioka:
    • Hung RM.
    • Did permanent routing of RM OSEM cables to IM.
    • Did temporary routing of RM OSEM in-vacuum cables to flange (4 channels).
    • Did semi-permanent routing of all OSEM external cables to satellite amps (10 channels)
    • Did temporary routing of RM OSEMs to PR2 rack (4 channels).
    • Took data with geophones connected but immobilized and then stored geophones in boxes.
    • Tested signals from first satellite amp getting to digital system.
    • Weighed mirror box.
    • Did fit check of flag holders for stub flags. Very minor adjustments will be needed.
    • Covered everything in preparation for modifications to clean booth roof (9/20-21).
  • Hirata-san:
    • Finished 3D CAD of SR2 and SR3 in tanks, with optical layout included.
    • Started 3D CAD for SRM.
    • Checked flag design.
    • Assembled a bottom filter (ongoing).
    • Cleaned maraging rods.
• Type B ongoing issues
• 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)
  • 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
  • Structure Analysis is checked. The purchacing parts can be proceeded, while the method of a part of the analysis is not proper.
  • Wire dimensions for the BFRM is fixed as same as BF/IM maraging rod.
  • Waiting for the quatation with the proper format together with other additional orders.
• Mirapro
  • Mirapro sent us a report about the optical bench wires. The top wires should be re-designed. Wires for PRs and BS will be ordered together.
  • Preparing for the order.
• Mirror preparasion
  • 1st wire breakers for PRs is not found even in Kashiwa. They should be ordered together with new flags.
  • Made the rough jigs for removing the current flags from the PR3 and spare mirrors togher with Hirose-san.
    • flag detaching will be done in November.
• F7 LVDT
  • Magnetic coupling noise induced by the magnets on F7 LVDT is calculated with the same way of Shimoda-kun's calculation. (Only in length direction.)
    • Current design is well enough for PRs.

IMMT (Ohishi)

• Put a report here

Watchdog system (Tanaka)

• Conference material.Measures for the inrush current and final design for Power supply part(Regulation type).PDF

Safety

• No issue

Discussion

• Maraging and SUS rod issue follow up.

  • Safety margin: No information from Virgo. Will ask them again (Takahashi).

  • SUS rod FEA report.

    • We will redesign the top rods for the optical bench suspensions.
    • For PR, Shoda will ask Mirapro to re-design. For BS and SR, Takahashi and Hirata will do the re-design.
    • PR+BS will be ordered with the PR assembly frame. SR rods will be ordered with the SR assembly.

  • Check with Ojima if more than 8mm nail head is possible or not: not yet asked. Will ask today (Takahashi)

• Temperature sensors on the suspensions ?
  • Temperature sensor on the Type-A BF may be necessary to monitor the temperature gradient from the cryogenic part.

    • We need to know what precision is necessary -> consult with CRY (Takahashi)

  • For Type-B and Bp, we may want to put a sensor on the top plate. It is possible to add those sensors after the installation. Considering the current work load, we will postpone the preparation until the next year.

Site work plan for the next week

• Mon:
• Tue: BS clean booth cross-bar cutting (Aso)
• Wed: BS clean booth cross-bar cutting (Aso)
• Thu:
• Fri:

Travel Plans

• Travel (Week of 9/19):
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato:
  • Ohishi:
• Travel (Week of 9/26):
  • Takahashi: 28 -30 (Accelerator check)
  • Shoda:
  • Mark: 26- 30
  • Fabian: 26- 30
  • Okutomi: 28 -30 (Accelerator check)
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato: 28 -30 (Accelerator check)
  • Ohishi:

Next meeting

2016/9/30(Fri) 13:30 -