VIS Meeting on 2016/3/4

2016/3/4 13:30 -

Kamioka NAOJ Room & SeeVogh

Participants:

Schedule

• Schedule status (Aso) (Chart)

PR3

• PR3 Installation Status
  • Mechanical Installation is done
  • Damping control status (Okutomi)
  • Actuator control (Shoda)

Plan for the next week

• Mon:
• Tue:
• Wed:
• Thu:
• Fri:

iKAGRA ETM suspension

• Current status (Ohishi)

Travel Plans

• Travel (Week of 3/7)
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 3/14)
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Other Mechanical Issues

• #OSEM assembly status (Akutsu)
• #Missing items(to be purchased soon)

  • #Traverser motor driver (Shoda) -> Will discuss Uraguchi-san. Need a box for stepping motor driver. -> These are for PR2. Will be ordered sometime.

Electronics

• What are necessary in the next few weeks ?
  • Nothing
• Watch dog system (Tanaka)
• Need to make Guradian script for PR3. Shoda + Fujii and Okutomi will write one after the mechanical installation is finished.
• Electronics diagram and review

  • Electronics document tree for VIS by Mark (http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4937)

  • Updated PR3 schematic with OpLev wiring (http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4795)

bKAGRA preparation

• Three big categories of the tasks
  • Type-A: Leader = Takahashi
  • Type-B (BS and SRC): Leader = Mark
  • Type-Bp modification: Leader = Shoda

Common Issues

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

  • Kick off meeting within February (Mark)
• BS prism preparation (Mark)
  • Now have quotes for both prisms and grooves for orders of both 4 and 12:

• Got a quotation from Shinko-sha (Takahashi)
  • 260KJPY for two. Lead time = 1.5month
• With the V-cut company being different from what LIGO used, the advantage of using US companies is not clear now.
• One possibility for risk reduction: buy 2 from US, 4 from JP and use 2 from JP for test hanging to see if they work fine or not. If they work fine, we can continue to use them for SR. If they fail, we have another set to try from US.

• Can we make SR wire breakers bigger ?

  • Check what happens if we widen the slit by 3.75mm and make a new M5 (Hirata) -> Result

    • Two concerns
      • The rework may bend the wing shaped parts.
      • The P.C.D. of the new screw holes may not coincide exactly with the other existing holes
    • Consult with Fukushima-san again. Takahashi will contact Fukushima-san
      • 型振り放電加工機 may be better

      • Will test machine the dirty recoil mass. Will have another meeting with Fukushima-san (Takahashi)

    • Do we need to widen the slits for PRC RMs ? -> Depends on how difficult it is to rework the RM.

• Flag design (Mark)

  • BS Flag Redesign on OneDrive

  • Could make BS optic flag shorter by about 4 mm ("BS Optic Flag Concept 3 (Small Magnet, Short)") but it would cause work for Tatsumi-san for little benefit.
  • Recommend "BS Optic Flag Concept 2 (Small Magnet)"
  • Fabian did rigid IM flag design ("TBD")
  • Widen the OSEM opening (Akutsu)
• BS dummy optics design (Fabian)

  • http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4811

  • The above design seems fine.

  • Hirata-san will get quotes from companies (consult with Takahashi-san which company to ask)

• IP base clamp (Fabian): Reduce the number of clamps-> Hirata-san finished 2D drawings. Trying to get quotation now.-> Still waiting for the quotation.-> Will get a quotation on the next Monday.

• Bread board spring (Takahashi): Hirata-san is getting quotations.Asked quotation with the above one all at once.
• Issues with lower optical bench and damper ring.
  • Last week's problem solved: support blocks on damper ring can be moved circumferentially to match support blocks on lower optical bench.
  • New problem: damper ring needs to have central hole enlarged to allow passage of suspension during installation.
  • New problem: nail-head parts are too short to hook in support blocks - need to be remade longer (and rods shortened to match).
• BS Assembly Frame Design (Mark, Hirata)
  • Design is almost complete
  • Need to add some mechanism to hook a load gauge
  • Need to add some attachment points (e.g., ferromagnetic plates) for placing wind-shield panels.

  • Check details with Hirata-san to make sure the interfaces with the hanging frame and the suspension (Mark)

  • Present the design at the next VIS meeting (Mark)

• #BS gluing jigs (Tatsumi)
• #Not enough crane height problem (Hirata, Saito)
• #BS clean bag (Aso)

Type A

• Task list (Takahashi)

• #Type-A Filters Optimal Load Measurements

  • #Takahashi will make a plan for the optimal load check and ask ATC.-> Check two filters per month from April 2016. -> Will be presented to the ATC steering committee.

  • #How to manufacture the long maraging wires ?
    • One prototype was machined by Ojima

    • Aoshima can do the heat treatment for the long rod. Will ask them soon (Takahashi) -> Still waiting for a quotation.

    • How to test it ?
      • We can use the prototype assembly frame in TAMA.

Type-Bp modification

• PR2 Wire breaker problem
  • Prism removal from PR2 (Hirose, Mark)
    • We need to send the spare mirror and the containers back to Kashiwa soon.
      • Bring back to Mitaka on 2/26.

    • Bring back CLIO suspension too (Takahashi) -> Not this time

Other

• Safety
• #GAS blade inspection by Virgo (Takahashi)
  • Shipped the blades. Will get results in 1-2 months.

Next meeting

2016/3/11 (Fri) 13:30 -

Next F2F 2016/4/1