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  * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=699|Weekly Report]]
  *

VIS Meeting on 2016/1/29

2015/1/29 13:30 -

Kamioka TV conference room + SeeVogh

Participants:

Schedule

  • Schedule status (Aso)
  • Cleaning of PRM and PR3 chamber from 2/1-2/3. PR2 and BS chambers from 2/4 - 2/6.

PR3

  • PR3 Installation Status (Takahashi)
    • An OSEM flag and a 2nd wire breaker came off. We had a special meeting on this.
    • PR3 dusts: leave them until bKAGRA when we replace the 1st prisms (recommendation from Hirose).
    • Traverser repair: Repair of the broken ones at Mitaka (status).

    • Screws to fix the front and back rings the RM were too long, or the tapping in the holes were too short. Couldn't use M5x40. Ordered M5x35 with vent holes. -> Delivered. Remember to replace them

  • PR3 flag and 2nd wire breaker repair status (Tatsumi)
  • #The frame for the clean bag is bent. We cannot remove the nut. Probably we need to cut the rod once we take the suspension out of the chamber. Need to prepare a replacement rod (Aso)

Plan for the next week

  • Mon: Chamber cleaning
  • Tue: Chamber cleaning
  • Wed: Chamber cleaning
  • Thu:
  • Fri:

PR2

  • IOO wants the optical bench back (Aso)
    • They were taken out.

  • #OpLev interference check (Akutsu)

Plan for the next week

  • Mon:
  • Tue:
  • Wed:
  • Thu:
  • Fri:

iKAGRA ETM suspension

  • Disassembly (and cleaning) of the suspensions (Ohishi)
  • Preparation of missing parts (Tatsumi, Takahashi)
    • Connectors: Will use two D-SUB9, one for coils and another one for Pico-motors

    • Plates to fix the connectors on the suspension frame were ordered. -> Expected delivery date Feb. 4th.

    • We have connector shells, pins and cables.

    • Coil bobin: Delivery date-> Feb. 4th.

  • PRM transportation (Tatsumi)
    • Thin plates to protect magnets arrived

    • Plastic container -> Delivery date 2/2

  • Dummy mirror: Washed and brought to Kamioka already.
  • Coil winding (Takahashi)

    • Wires: will use the capton wires prepared for the LVDT coils. Will send the wire spec. to kagra-seis

    • Winding tools: Stocked in the 20m lab. Will send it to Kamioka in the next week.

    • Two of Ando lab. students will come to Kamioka to wind the coils from 2/8.

Plan for the next week

Travel Plans

  • Travel (Week of 2/1)

    • Takahashi:Mon-Fri

    • Shoda:Mon-Fri

    • Mark:
    • Fabian:

    • Okutomi:Mon-Fri

    • Fujii:Mon-Fri

    • Ishizaki:
    • Hirata:
    • Ohishi:
  • Travel (Week of 2/8)
    • Takahashi:
    • Shoda:
    • Mark:
    • Fabian:
    • Okutomi:
    • Fujii:
    • Ishizaki:
    • Hirata:
    • Ohishi:

Other Mechanical Issues

  • BF Optimal Weight (Takahashi)

    • Inscription of the number on the BF #1 and BS BF should be done.-> Will be done on 1/26. Also plan to install LVDT coils and check the optimal load of BF #5 and #6.

    • Balast masses: Delivered ?
  • IM wire clamps

    • Need to send the wire clams used for the test hanging to I-ject (Takahashi)

  • Wire winches

    • Need to send the old winches back to ATC for repair. We need a coordination with Ikenoue-san for this work (Takahashi)

  • #Traverser actuation check (Shoda)
  • #PR CAD model and assembly drawings (Hirata)
    • Aso calculated the rotation angle
      • PR3: 0.786deg counter clockwise from the line connecting the centers of the PR3 and BS chambers.
      • Will make a report soon.
  • #Clean work procedure
    • Order clean wipes (Aso)
    • KAGRA should have a special meeting for clean requirements: Will propose another meeting. (Aso)
  • #Wire cleaning (Hirata)

    • Hirata will order 20m more wires. -> Delivered. Will wipe in the next week. -> Finished. Will send to Kamioka soon.

    • Will wash Tungsten wire delivery status -> Delivered. Will wipe in the next week -> Finished. Will send to Kamioka soon.

  • #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
  • #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
  • Electronics diagram and review

    • A diagram from Shoda

    • Mark will make overview diagrams of VIS electronics by the end of Jan.

    • Review of PR3 electronics early February-> 2/3 ?

  • #LVDT distributor connector problem

    • Miyakawa-san circulated a design of the conversion cable (D9-D15): drawing

  • #Digital System (Okutomi, Fujii)
  • #Cable status (Takahashi)

    • Need to send more PTFE cable to finish the remaining two -> Will do it in the next week

    • Need to send the cables used for the test hanging once it is finished. -> Will send them once the test hanging is disassembled.

  • #Cable check
    • Liu-kun Zhao-kun finished checking all the cables. They found another broken cable.
    • Will send the broken cables together with the other cable related items (Takahashi).

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: Continue discussion (Aso, Raffaele)

Common Issues

  • Wire breaker problem (Mark, Tatsumi)
    • Prism removal from PR2 (Mark)
    • BS prism preparation
      • Contacted the company LIGO used for the possibility of buying sapphire prisms (Mark)
      • They are happy to take an order. No Japanese agent. But international order can be taken.

      • Will ask for the lead time to the company (Mark) Drawing to be sent (LIGO drawing)

    • Can we make SR wire breakers bigger ?

      • Asked Fuskushima-san about the possibility of widening the slits (Takahashi) -> It is possible but there is a risk of slight deformation.

      • We will try to widen the slit using the dirty RM used for the test hanging.

      • We need to decide on how much to widen. Check what happens if we use 5mm tall prism on CAD (Hirata) -> Result

  • RM cleaning (Takahashi)

    • Which RMs are really clean ?-> 1st one and the 2nd one have different finish. So only the 1st one is dirty.

    • For the cleaning purpose, using a leutor seems enough

BS and SR

Type A

  • Task list (Takahashi): Present at the next VIS meeting.
  • Fishing rod production status (Takahashi)
    • Ordered the material for the blades.
    • Stepping motors were ordered. Will be able to buy all the other stuff within this FY.
  • #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

Other

  • Clean wear
  • Work reports
    • Both on-site and off-site works should be reported in the KAGRA e-log.
    • A weekly summary entry should be posted before the weekly meeting: the entry should be an itemized list of things done with links to detailed e-log entries.
  • Safety
  • #Installation procedure document
    • Many people need to contribute to the document. However, we need one person responsible for the consistency of the document.
    • BS installation document: Mark will be the editor.
  • #Watch dog system (Tanaka)
    • Presentation at the next AEL meeting
  • #GAS blade inspection by Virgo (Takahashi)
    • Shipped the blades. Will get results in 1-2 months.

Next meeting

2015/2/5 (Fri) 13:30 -

The next F2F at Mitaka: 2/19

KAGRA/Subgroups/VIS/VISMinutes20160129 (last edited 2016-01-29 17:09:17 by YoichiAso)