• KAGRA
• Subgroups
• VIS
• VISMinutes20160219

VIS Meeting on 2016/2/19

2015/2/19 13:30 -

Room 210

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

Schedule

• Schedule status (Aso) (Chart)

PR3

• PR3 Installation Status (Takahashi)
  • When releasing the IM, one of the flags on the TM was broken (came off).
  • We decided to fix the mirror with respect to the RM. Now the suspension acts as a double-pendulum, damped by the IM.
  • Yaw can be adjusted by the traverser, Pitch can be adjusted by the IM.
  • Transfer functions from IM to IM were measured.
    • Some strange results
    • The vertical resonant frequency is higher than expected
    • Length transfer function has many unknown peaks
• The frame for the clean bag is bent.
  • Mirapro will come on 22nd to make changes.
• Pre-installation cleaning of the suspension
  • Vacuum cleaner

  • Wiper-> Ask Hirose-san to send to Kamioka (Aso)

  • Ethanol-> Bring the bottle to the tunnel.

• Crane will not be available on 2/25 in the morning for the crane upgrade to remote control.

Plan for the next week

• Mon: F2F
• Tue: Re-cabling, LVDT check, fishing rod check, traverser check.
• Wed: Vacuum installation preparation
• Thu: Vacuum installation
• Fri: Post-vacuum installation work

iKAGRA ETM suspension

• Current status (Ohishi)

Travel Plans

• Travel (Week of 2/22)

  • Takahashi:Wed - Thu (Fri: Akeno for the acceptance of IP from NIKHEF)

  • Shoda:Tue - Fri

  • Mark:
  • Fabian:

  • Okutomi:Tue - Fri

  • Fujii:Tue - Fri

  • Ishizaki:
  • Hirata:
  • Ohishi:

KAGRA F2F 2/21 - 23

• Travel (Week of 2/29)
  • Takahashi:
  • Shoda:?
  • Mark:
  • Fabian:
  • Okutomi: ?
  • Fujii:?
  • Ishizaki:
  • Hirata:
  • Ohishi:

Other Mechanical Issues

• #Production of additional PR winches (Akutsu)

  • Shipping status (Takahashi, Hirata) -> Wrapped. Will be shipped with IP in the next week.

• #OSEM assembly status (Akutsu)
• #List of what should be changed for PR3 hanging
  • People should share ideas whenever they come up with missing thigns.
  • Shoda made a spread sheet for keep tracking the ideas

    • https://docs.google.com/spreadsheets/d/1zZaLObWjDSEOTrr85Hz0ApXxEUChK3xJ_chk0f7r5nY/edit?usp=sharing

    • All the items are now done or being taken care of
• #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)
  • Ordered parts to Hokushin
  • About to order PCB to P-ban
• #Electronics diagram and review

  • Mark: detailed schematics nearly ready to post - D1503615 (full PR3), D1604795 (iKAGRA PR3)

  • Mark: started overview schematic diagram,

• #Need to make Guradian script for PR3. Shoda + Fujii and Okutomi will write one after the mechanical installation is finished.
• #Digital System (Okutomi, Fujii)

bKAGRA preparation

• Three big categories of the tasks
  • Type-A: Leader = Takahashi: Task list, team members
  • Type-B (BS and SRC): Leader = Mark: Task list, team members
  • Type-Bp modification: Leader = Shoda (Aso, Raffaele)

Common Issues

Type-B

• Task listKAGRA/Subgroups/VIS/TypeB/TaskList

  • Kick off meeting within February (Mark)
• BS prism preparation (Mark)

  • 5mm prism drawing

  • Confirmed with Hirata-san that BS can use same 5 mm prism as SR (grooves, wire clearance all OK).
  • Confirmed with Tatsumi-san that not a big deal to use smaller BS prism as long as secondary position not changed.
  • Submitted 5 mm prism drawing to company that did LIGO HSTS prism (except grooves), waiting on response.
  • Second company that did LIGO groove cutting not interested in quoting - exploring other US companies.
  • Should contact Shinko-sha again (Takahashi)
    • Asked a quotation to Shinko-sha, gave the new drawing. Will ask about anealing (Takahashi)
• 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.

    • Wider cuts will break the horizontal balance. Need to check how much compensation mass is reduced (Hirata) -> 2mm reduction will be necessary. We can do this.

• Flag design (Mark)

  • Mark's drawings

  • Make shorter by small changes
  • Widen the OSEM opening (Akutsu)
• BS dummy optics design (Fabian)

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

  • Finalizing the design by the end of next week

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

• Bread board spring (Takahashi): Hirata-san is getting quotations.Asked quotation with the above one all at once.
• #BS Assembly Frame Design (Aso, Hirata)
• #BS gluing jigs (Tatsumi)
• #Not enough crane height problem (Hirata, Saito)
• #BS clean bag (Aso)

Type A

• Task list (Takahashi)

• Need to decide members
• #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 out the spare mirror and two containers out from the tunnel on 24th.
    • Need to ask someone for loading help
    • Bring back CLIO suspension too (Takahashi)

Other

• Safety
  • No incident for VIS
  • Some injuries in other groups
• #GAS blade inspection by Virgo (Takahashi)
  • Shipped the blades. Will get results in 1-2 months.

Next meeting

2015/2/26 (Fri) 13:30 -

Next F2F 2016/4/1