Agenda/Minutes of the VIS Meeting on 2017/2/10

2017/2/10 13:30 -

Participants: Mark, Shoda, Ishizaki, Sato, Okutomi, Aso, Takahashi, Ohishi, Hirata, Fabian, Enzo, Fujii, Tanaka

Progress report

Schedule Chart : (PDF,MPP)

• Type-A: Mostly on schedule
• Type-B: 1 week delay
• Type-Bp: On schedule now, but expect to have one week delay in the next week.

Type-A (Takahashi)

Past week report

• Minutes of Type-A Meeting

• Installation in Y-end
  • 7(Tue): Assembled the dummy payload and the EQ stop for it. Pre-assembled BF damper. Assembled the EQ stop for BF.
  • 8(Wed): Assembled the BF. Measured the weight of BF (105.7kg).
  • 9(Thu): Installed the dummy payload and the BF with athe EQ stop into the top chamber.
• Maraging wire: The wires after aging were delivered on 7th. The 3.3m wire will be treated at Himeji facility of Kinzoku-giken.

Plan for coming weeks

• Install the protection net ring.
• Tune the weight of dummy payload.
• Assemble the BF damper with the support ring.
• Lift down the dummy payload.
• Set the EQ stop for F3.

Type B (Mark)

Past week report

• Hirata-san:
  • Did drawings of SR damper.
• Mark, Fabian, Enzo and Hirata-san (at Kamioka):
  • Took the end plate off the IM to get access to the pitch/roll picos.
  • Found the pitch pico was unreliable and replaced it.
  • Found the springs were not stiff enough, and immobilized 7 turns at the end of each with Cu wire to make them stiffer.
  • Reassembled and rebalanced the IM.
  • Reassembled and adjusted the IRM.
  • Discovered that the transverse offset between IRM and IM could be corrected by adjusting the roll of the BF.
  • Adjusted IM OSEMs to half-way.
  • Made and installed a new pair of wires for the BF yaw pico on the IM pico adapter (Hirata-san).
  • Installed an improved LVDT cable made by Hirata-san.
  • Made and hung posters for the Elites meeting visitors.==== Plan for coming weeks ====

Plan for coming weeks

• Enzo to stay in Mitaka and concentrate on getting drivers' license
• Mark and Fabian to come to Kamioka and finish adjusting OSEMs and take TFs.
• Assorted procedure writing and design tasks (SR frame etc)

Discussion

• Omit detailed TF measurements to expedite the work

Type-Bp (Shoda)

Past week report

• Main suspension
  • Active damping for IM are implemented.
  • BF FR was tested with the new driver chassis.
  • BF GAS LVDT was calibrated by inserting 1 mm sims.
  • New BF LVDTs are assembled.
  • BF cap, BFRM, and the EQ stop parts bewlo the SF are assembled.
    • The BFRM is now sitting on the spacer attached on the BF.
  • Note: the company delivered other coated screws for the screws which we assigned as SDC with a vent hole. Be careful.
• Optical bench suspension
  • Optical bench installation jigs, wire adapters for the optical bench, and optical bench suspension rods are assembled.
  • The OB installation jigs was tested a little.
• Others
  • The temporally clean booth was cleaned and the floor sheet will be changed.

  • The EQ stop bars below the IM did not seem to be dirty now. -> Only old aluminum parts should be re-made.

  • BFRM suspension rods are delivered -> 2nd assembly test at Mitaka?

Plan for coming weeks

• Optical bench suspension test.
  • Assemble magnets on the OB Damper
  • Suspend the OB damper, OB intermediate mass, and OB for the test.

Discussion

• The support jig for the optical bench installation
  • The structure seems OK for supporting the damper ring. Try carefully in the next week's test assembly. Ask Shindo-san to help the work.
  • For extra safety, improved support jig will be ordered to Mirapro (Shoda)
• Oxidized(?) aluminum parts
  • Type-Bp team will inspect the stored ones to see if we need to re-make them or not.

IMMT (Ohishi)

Past week report

Looking for jig parts http://klog.icrr.u-tokyo.ac.jp/osl/?r=2439

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

Plan for coming weeks

Safety

• Incidents:
• Foreseen risks
  • Type-A: Crane works. Be careful not to drop things.
  • Type-B: no dangerous work foreseen
  • Type-Bp: Optical bench installation work needs to be done carefully.

Discussion

• Disassembly procedure proposal (Shoda) document

  • It is better to avoid the flipping of the RM+TM.
  • A better procedure was found during the discussion at the meeting.
  • Hirata-san will design necessary jigs for this procedure in the next week.

Travel Plans

• Travel (Week of 2/13):
  • Takahashi: 13-16
  • Shoda: 13-16
  • Mark: 13-16
  • Fabian: 13-16
  • Okutomi: 13-16
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato: 13-16
  • Enzo:
  • Hashimoto (Hosei Univ.): 13-16
  • Someya (Hosei Univ.): 13-16
  • Ohishi:
• Travel (Week of 2/20):
  • Takahashi: 20- 24
  • Shoda: 21 - 24
  • Mark: 20 - 24
  • Fabian: 20 - 24
  • Okutomi: 20 - 22
  • Fujii:
  • Ishizaki: 20 - 24
  • Hirata: 20 - 24
  • Sato: 20 - 24
  • Enzo: 20 - 24
  • Hashimoto (Hosei Univ.): 20 - 24
  • Ohishi:
  • Tanaka:

Next meeting

On 2017/2/17(Fri) in Mitaka

March VIS F2F: March 3