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• VISMinutes20170120

Agenda/Minutes of the VIS Meeting on 2017/1/20

2017/1/20 13:30 -

Participants: Ishizaki, Tanaka, Sato, Hirata, Mark, Enzo, Shoda, Takahashi, Kasuya, Fabian, Aso, Okutomi, Akutsu, Raffaele

Progress report

Schedule Chart : (PDF,MPP)

Type-A (Takahashi)

• Minutes of Type-A Meeting

• EYV chamber: Top chamber was disconnected. The position and the height of corrugated tube top was measured.
• Pre-isolator: It was expensive to make new boxes for packing the pre-isolators. We reuse the boxes for IP,
  • The pre-isolators will be removed from the large clean room on 23rd.
• EQ stop: The bottom anchor at the cross tube was ordered.
• BF damper: Delivered to Kamioka on 20th.
• Maraging wire: The production is delay by one week. Still asking the company about aging of the 3.3m wire.
• Preparation of installation: Start from covering the floor by stainless steel sheet on 24th.

Type B (Mark)

• Hirata-san:
  • Updated the 3D assembly model for BS (among other issues, it turned out that parts were not correctly mated near where the suspension sits on the hydraulic jacks in the tank).
  • Liaised with IJECT.
  • Made an inventory for Type B (BS and SR).
  • Packed and shipped second winch to Kamioka.
  • Packed some jigs for adjusting BF blades.
  • Attended NINS information security seminar.
  • Attended the public hearing for the Opt-IR Research Division Chief Election.
• Mark, Fabian, Enzo
  • Cabled IM picos and used IM yaw pico for adjusting RM. (Later, a wire broke at the connector, disabling the IM yaw, but we were able to continue by manually rotting the pic.)
  • Helped Takahashi-san in adjusting BF.
  • Initial round of adjustment made transverse perfect but overshot in longitudinal and made vertical unstable.
  • Second round of adjustment made vertical stable but left longitudinal offset.
  • Concluded that we can probably manage without bringing the BF back to Mitaka, but it will take some careful surveying of the existing offset and several more days of adjustment.

Type-Bp (Shoda)

• Hanging report: The spare mirror and the RM was hanged.

  • Since the suspension wire slipped out from the drum on the winch, we replaced the winch, and re-hang the spare mirror. This time, we could hang the spare mirror without accidents.
  • We re-clamped the wire since the spare mirror tilted largely when we clamped the wires. It seems that the wire clamp plate slipped when we tighten the screws.
  • After re-clamping, we also observed the slow drift of the mirror orientation in tilt. Now the mirror HR surface facing down by 8.5/1000 rad. But we will continue the test hanging, since it does not matter for the purpose of the test hanging. We will have to wait for about 10 mins when we clamp the wires for the actual mirrors.
  • RM was inserted properly and hanged. The modification on RM trolley worked well. I was happy with the RM stabilized by the modification.

• Next week task Goal: suspend IM and IRM

  • Check TF of the RM using PSs.
  • Assemble the EQ stop below the BF, and set the BF on it.
  • Hang IM from the BF.
  • Hang IRM.

• The BFRM parts will be delivered on 20th. --> Test assembly in the next or next next week.

• To Do

  • Establish the disassembly procedure
  • Modify the mirror box
  • Buy the new mirror gluing tools for KAGRA

IMMT (Ohishi)

• Put a report here

Watchdog system (Tanaka)

• Progress
  • I explained the outline of PCB design at the AEL meeting(16.Jan.2017).
  • I preceded orders for semiconductor relays used in WDS(main).

• Document(Main rack( Main board + peripheral board )design.for meeting)PDF(JGW-E1706072)

• PCB Design(Detail)PDF(JGW-E1706074)

Safety

• Incidents:
• Foreseen risks
  • Type-A: use a crane for the construction of foothold
  • Type-B: adjustment of the blades
  • Type-Bp: a crane work for setting the BF.

Discussion

• Travel plan for the rest of the FY (Aso)
  • Please check and update (if necessary) the following travel sheet.

  • Travel Plan Sheet

• Smaller coil design status update (Aso)
  • Two possible designs for the magnet base

    • LIGO style one: image

      • A dumbbell shaped aluminum stand-off

      • Smaller footprint -> smaller thermal noise

      • Relatively soft (14kHz internal resonance)
      • Easy to be bent

    • VIRGO style one: image

      • Embedding a magnet in a aluminum cylinder

      • Has a larger footprint -> larger thermal noise.

      • Rigid structure. Internal mode frequency is about 94kHz.
  • After some discussion, we will employ the VIRGO like design.
    • We probably do not need a chamfer.

Site work plan for the next week

• Mon: BF Adjustment (Type-B)/Measure TF (Type-Bp)
• Tue: Preparation (Type-A)/BF Adjustment (Type-B)/EQ stop assembly, BF setting (Type-Bp)
• Wed: Preparation (Type-A)/BF Adjustment (Type-B)/IM haning (Type-Bp)
• Thu: Preparation (Type-A)/TF measurement (Type-B)/IM haning (Type-Bp)
• Fri: Preparation (Type-A)/TF measurement (Type-B)/IM haning (Type-Bp)

Travel Plans

• Travel (Week of 1/23):
  • Takahashi: 23-27
  • Shoda: 23-27
  • Mark: 23-27
  • Fabian:
  • Okutomi: 23-27
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato: 23-27
  • Enzo: 23-27
  • Hashimoto (Hosei Univ.): 25-27
  • Someya (Hosei Univ.): 23-27
  • Ohishi:
• Travel (Week of 1/30):
  • Takahashi: 30-2/3
  • Shoda: 31-2/3
  • Mark: 30-2/3
  • Fabian:
  • Okutomi: 30-2/3
  • Fujii:
  • Ishizaki: 30-2/3
  • Hirata:
  • Sato: 30-2/3
  • Enzo: 30-2/3
  • Ohishi:

Next meeting

On 2017/1/27(Fri) VIS F2F: Feb. 17th