• KAGRA
• Subgroups
• VIS
• VISMinutes20160108

VIS Meeting on 2016/1/8

2015/12/25 13:30 -

Kamioka TV conference room + SeeVogh

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

Schedule

• Schedule status (Aso)

PR

• Test Hanging Status (Takahashi)
  • Transfer function measurements (Shoda)

    • Measured all the measurable DOFs using OSEM and OpLev.

    • Found that a HPF exists in the satellite box
    • Will do the calibration next (Shoda)
  • Mirror position confirmation (Shoda)
    • Used two measurement methods: a 3D arm and a surveying instrument
      • The mirror is off from the center of the chamber by 2mm (roughly consistent results were obtained from the two measurement methods)

      • http://klog.icrr.u-tokyo.ac.jp/osl/?r=586

    • The original position of the traverser may have been wrong

    • The real problem seems to be the fact that we could not move the traverser more than 1cm -> Uraguchi-san will come to fix this problem

  • LVDT distributor problem
    • Connector for the coil driver input is D9 whereas the output from the HP coil driver is D15.

    • Will discuss with AEL for the permanent solution at the next AEL meeting (1/12)

  • 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)

• PR2 Status (Mark, Fabian)
  • Temporary clean booth was moved to the BS area.
  • Two stainless steel cabinets arrived
  • The clean booth company came to tighten the frames of the clean booth. They may have generated dusts. Need cleaning.
• Location of the EQ stop pillars (Takahashi)
  • Locations were reported by Takahashi

    • Interference with OpLev : For PR3, the actual OpLev is working. So it is fine. Need to check PR2.

• Digital System (Okutomi, Fujii)
  • Having a trouble with the inter-computer communication.
• BF Optimal Weight (Takahashi)
  • Check the optimal load for the ETM BFs at the ATC (Hirata)

    • #4 BF: 52.8kg (old) -> 52.7kg (New) without fishing rod

    • #3 BF: 51.2kg (old) -> 53.2kg (New) without fishing rod

  • The above two have inscription of the ID number.
  • Inscription of the number on the BF #2 and BS BF should be done before the transportation to Kamioka on Thursday. Will ask Saito-san of ATC for his availability (Takahashi)
  • Balast mass design: Will ask for quotation to companies now (Hirata)
• Traverser actuation check (Shoda)
• Traverser stop mechanism
  • Parts were sent to Kamioka.

  • Takahashi-san will find where these are stored

• Clean work procedure

  • Order clean wipes (Aso)

  • KAGRA should have a special meeting for clean requirements: Will propose another meeting. (Aso)

• 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.

• 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

  • 70% done -> Liu-kun is available to come in the next week.

  • One cable found to be broken. Will send it back to the company -> not yet. Send it together with the other cable related items.

• Call for shift for assembly help (Takahashi)

  • Made a call for shift for helping the installation works -> Contact people who did VIS shifts in the past. Aso will talk to Somiya-san.

• PR2 wire breaker problem (Mark, Tatsumi)
  • Prism removal status (Mark)
    • Hirose-san proposed a design (a cup at the bottom configuration)

    • Some questions were raised by the VIS team. Mark will report them to Hirose-san.

  • SUS wire breaker order status (Takahashi) -> Expected delivery date is 1/22. Waiting for more concrete answer from the company.

  • For BS prisms, should we ask the company which made LIGO prisms ?

    • Contact the company LIGO used for the possibility of buying sapphire prisms (Mark)

    • Compare the size of the prisms of LIGO and KAGRA -> 5mm tall, roughly the same as KAGRA BS.

    • Can we make SR wire breakers bigger ? Check with the CAD model (Hirata)

• 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)
• RM production (Takahashi)

  • What to do with the dirty RMs ?: Check with ATC if re-polishing the rough surface is possible or not (Takahashi) -> It is possible but machining will eat 0.5mm.

  • For PR3, we will use the RM prepared for PR2, which is clean.

  • Ask Fukushima-san if machining the slit part is possible or not (Takahashi)

• 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

• Missing items(to be purchased soon)
  

  • Picomotor drivers (Takahashi) -> Delivered

  • Signal generators for LVDTs (Aso) -> Ordered. Will be delivered very soon.

  • Serial-Ethernet converter: 7 more (Shoda) -> Ishizaki-san ordered them. Delivery 1/14.

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

  • Turn backles (bigger and eye). Smaller shackles. (Aso) -> Ishizaki-san ordered. Delivery may be 1/18

• How to put the PR3 suspension back to the assembly frame ?
  • Align the EQ stop ring for IM to the hanging frame.
• Next week (from 1/12) plan
  • Test hanging
    • Mon: holiday

    • Tue:Pull out, Remove the EQ stop around the mirror.

    • Wed: Move PR3 to the spare mirror container. Take out the RM and the spare mirror
    • Thu: Remove the BF from the traverser

    • Fri:Continue

  • PR2

    • Mon:holiday

    • Tue:

    • Wed:Covering up the assembly set up

    • Thu: Covering up the assembly set up
    • Fri:
• Travel (Week of 1/12)

  • Takahashi:Tue-Fri

  • Shoda:Tue-Fri

  • Mark:Tue-Thu

  • Fabian:Tue-Thu

  • Okutomi:Tue-Fri

  • Fujii:Tue-Fri

  • Ishizaki:
  • Hirata:

  • Ohishi:in Mitaka

• Travel (Week of 1/18)

  • Takahashi:Tue-Fri

  • Shoda: Tue-Fri
  • Mark:
  • Fabian:
  • Okutomi: Tue-Fri
  • Fujii: Tue-Fri
  • Ishizaki:
  • Hirata:
  • Ohishi:

* Joris: 1/11-1/29

* 1/18 Sekiguchi-kun's PhD defense

BS

• BS Assembly Frame Design (Aso, Hirata)
• BS flag design (Mark, Fabian)
• BS gluing jigs (Tatsumi)
• Not enough crane height problem (Hirata, Saito)
• IP base clamp (Fabian)
• Bread board spring (Takahashi)
  • Need a review: Show the design at the next F2F VIS meeting (Takahashi)
• BS clean bag (Aso)

ETM

• Preparation tasks
  • Prepare missing parts
    • Check what are missing: Tasumi
    • Get quotation: Tasumi

      • http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4741

    • Order the missing parts: Takahashi
    • Wind coil wires: Takahashi+Some student (from Ando-lab ?)
    • Check coils: The above student
  • Disassemble the suspensions at Mitaka: Ohishi, Torii,
  • Wash the suspension part: Ohishi + Hirata
  • Send the parts to Kamioka: Hirata
  • Assemble the suspensions at Kamioka: Ohishi, Tomaru, Uchiyama
    • Transfer function check
    • Transportation to the end: we need to consider the actual method carefully
  • Send PRMs to Kamioka: Ask Tatsumi-san (Aso)
    • Drag wipe at Mitaka
    • First contact ?
    • Container ?

Other

• Fishing rod production stauts (Takahashi)

  • We may not be able to buy blades in this FY. WIll check with the company (Takahashi)

  • Stepping motors and other components can be purchased within this FY.
• bKAGRA preparation

  • Task list (Takahashi)

  • Roughly divide the task to three categories
    • Preparation of Type-B suspensions (BS and SR)
    • Modification of PR suspensions
    • Type-A
• Electronics
  • Electronics diagram and review

    • A diagram from Shoda

    • Mark will make overview diagrams of VIS electronics

  • What are necessary in the next few weeks ?
• 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)
  • Will present at an AEL meeting on 1/12
• GAS blade inspection by Virgo (Takahashi)
  • Shipped the blades. Will get results in 1-2 months.
• Type-A Filters Optimal Load Measurements
  • If we can get help from ATC to measure the optimal load in Mitaka, it will be good.

  • Takahashi will make a plan for the optimal load check and ask ATC.-> Will make one in the next week.

  • 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.
• Safety at the site (Takahashi, Ishizaki)
  • The heavy side flange was difficult to put it back.

Next meeting

2015/1/15 (Fri) 13:30 -