Agenda/Minutes of the VIS Meeting on 2016/12/2

2016/12/2 13:30 -

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

Progress report

Schedule Chart (PDF,MPP)

Type-A (Takahashi)

• Minutes of Type-A Meeting

• Installation: The first transportation to Y-end for Type-A items is scheduled on 7-9th. The second one is scheduled in early January.
• Pre-isolator: Cable connection and check were finished. Two sets have been shipped on 1st.
• EQ stop, release sensor, dummy payload: The parts remained will be delivered on 12th.
• BF damper: The production is on going.
• Maraging wire: Ordered. The first set will be delivered by 20th January.
• Tooling for installation: The hoist tool was ordered.

Type B (Mark)

• Mark worked on task lists and schedule.

• Mark worked on an update of the BS Electronic Items doc (E1505111) and started a SRx Electronics Items doc (E1605886).

• Mark did a summary spreadsheet of Takahashi-san's cable orders to see what needed to be ordered immediately (new BS TM OSEM cables; geophone adapters) and later (for SRx).

• Mark worked on an update of the In-Vacuum Cable doc (E1503901), including information on final lengths that Fabian and Hirata-san had decided when making adapter cables.

• Mark considered an alternative cabling scheme for the geophones (with a different adapter cable to put the signals and power on different lines and a matching unscrambler) but ended up concluding that the existing design would probably be OK. See 00 Revised Geophone-v2.PDF.

• Fabian worked on a redesign of the EQ stops for the BS (2 of 4 screws under the RM are opposite large holes and there are no screws to restrain the RM front/back at either top or bottom).
• Hirata-san worked on PR/SR mirror box modifications with Shoda-san (on-going).
• Hirata-san partially assembled a bottom filter for use in fit tests of the PRx BF recoil mass.

• Need to order geophones immediately (Takahashi)

Type-Bp (Shoda)

• Installation preperation

  • Flag removing is postponed because we found that some of the parts are required to be re-manufactured.
    

    • We will try again at 9th Dec.
  • New assembly frame will be constructed on 12th and 13th Dec.
  • Flag/Wire breaker glueing will be done on 15th and 16th Dec.
  • Hopefully, the mirror will be sent to Kamioka on 19th and we can start hanging from 20th Dec. (19th is extended chief MTG.)
• Design
  • For the installation of the main suspension chain, a clean chain block is ordered. Pararelly, removable jacks on the inner frame is being prepared.
  • 3D design of the mirror box modification is almost done. 2D drawings have to be prepared.
• PR3 will be returned to Mitaka today. Need to transport it to Kashiwa.

IMMT (Ohishi)

• Schedule
  • Most of the parts will be assembled and delivered to Kamioka on 28th Dec.
    • Dec 20th：Processing completion
    • Dec 21th-22th：Assembly
    • Dec 26th ：Optional extra day
    • Dec 27th：Shipping
  • It depends on the mirror and jig status, but I think the mirror will be hung
    • without magnets/standoff for initial alignment scheduled in January (Need to be confirmed).

    • We need to suspend the mirrors with magnets and standoffs. Will arrange with Hirose-san for the gluing work (Aso)

  • Hanging and installation will start from 4th January.
  • Two people from FCL are coming for hanging and installation till 12th January.
• Mirror
  • Need to contacted with Hirose-san:
    • IMMT1:
      • Ø: 99.77 mm; Thickness at thinnest point: 51.76 mm; Wedge: 2.45°
    • IMMT2:
      • Ø: 99.75 mm; Thickness at thinnest point: 52.93 mm; Wedge: 2.45°
    • Thickness of the mirrors are 1.17mm different.
• Magnet and standoff fixture jig
  • Plan to modify MC jig
  • MC jig: perhaps still in Kashiwa.
  • Need at least two new parts and two sims for different thickness of the mirror.
• Hanging jig
  • Now in Mitaka. Will be delivered to Kamioka by Tatsumi-san.
• Drawings
  • will be uploaded to dropbox.
• Remaining parts status
  • PZT holder: asked FCL to make quotation.
  • coil holders: drawings exist. need to check before ordering.
  • D-sub holders; We had two holders but now one of it was used for MCo.
    • Need to make another one.
• Hanging and Installation Procedure:
  • Because it is difficult to install IMMT2 from side flange,
    • we are planning to install IMMT2 from the top flange.
  • Need discussion with Hirose-san about cleanliness control.
  • IMMTs are not on the center line where crane moves.
    • So perhaps we need to move IMMT by hand after we install it from the top flange.
  • Prepare hanging and installation manual next week.
• Place for hanging:
  • Unfortunately I could not have find breadboard(GIF) legs.
  • Ask Kawamura-san if I can use small optical table that was used at MC recently replaced with larger optical bench.
• Cables:
  • For initial alignment, planned in January, I think only Pico-motors will be necessary. (Need to be confirmed; Coils will not be used for initial alignment.)
  • There already cables used when it was used for iKAGRA ETMs.
  • Check the place where cables are now; flippers are in branch office.
  • Check Flange
• Digital models
  • Have not prepared yet.
  • IMMT picomotor drivers are located in Mozumi now.
  • Miyo-san said he already setup IP for IMMT drivers and will prepare network port in IOO rack next next week.
• Others
  • Nippon Tungsten Company will give us sample of wires.
  • Pushers: Ask MIF to prepare it.
  • IMMT2 frame were modified to secure +/-1cm range for pico-motor.
    • However, IMMT1 frame were not modified so the range is +/-5mm (originally).

Watchdog system (Tanaka)

• Test on the central power supply shows that the regulator chip is over heated.
• Preparing a test for a smaller power supply circuit put on each WD board.

Safety

• Incidents:
• Foreseen risks:
  • BS: will avoid any dangerous work because there will be only two people
  • Type-A transportation: Carefully watch the company workers. Insist to handle the items carefully.

Discussion

• Mirror box modification
  • Shoda-san showed the current design. Basically the design seems OK.
  • The modification of the mirror box (shorten the rods and modify the lids) is difficult to do quickly because mirrors are already in the boxes.
    • We will postpone the modification of the mirror box to after the test hanging is started
  • Other modifications (tying the sliders together, adding pulling screws to the RM base and adding fixing screws for the RM) will be performed before the test hanging starts.

  • Mark will send the RM base parts from Kamioka on Monday. Shoda-san will send Mark details of what to look for where.

Site work plan for the next week

• Mon: BS
• Tue: BS
• Wed: BS/Type-A transportation
• Thu: BS/Type-A transportation
• Fri: BS/Type-A transportation

Travel Plans

• Travel (Week of 12/5):
  • Takahashi: 12/6-12/9
  • Shoda: 12/7-12/8 f2f, 12/9 Kashiwa
  • Mark: 12/5-12/9
  • Fabian: 12/5-12/9
  • Okutomi: 12/7-12/8 f2f
  • Fujii: 12/7-12/8 f2f
  • Ishizaki: 12/6-12/9
  • Hirata:
  • Sato:
  • Enzo: 12/7-12/8 f2f (Hongo)
  • Ohishi: 12/5-12/6 Hongo
• Travel (Week of 12/12):
  • Takahashi:
  • Shoda: 12/12-13 Assembly frame, 12/15 or 16 (Kashiwa)
  • Mark: 12/12-12/16 (depending on BS vs SRx progress)
  • Fabian: 12/12-12/16
  • Okutomi:
  • Fujii: 12/15 or 16 (Kashiwa)
  • Ishizaki:
  • Hirata:
  • Sato:
  • Enzo: 12/12-12/16 (for Type B )
  • Ohishi:

Next meeting

On 2016/12/9(Fri)