• KAGRA
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• VIS
• VISMinutes20151225

VIS Meeting on 2015/12/25

2015/12/25 13:30 -

Kamioka TV conference room + SeeVogh

Participants: Fabian, Fujii, Shoda, Aso, Hirata, Takahashi, Ishizaki, Ohishi, Tatsumi, Okutomi

Schedule

• Schedule status (Aso)

  • Latest schedule chart

PR

• Test Hanging Status (Takahashi)
  • Transfer function measurements (Shoda)
    • Now we can measure the TFs with the digital system
    • Strange HPF in 0.1-1Hz. Don't know where it comes from.
    • Actuator electronics has no such a thing. Maybe OSEM signal has HPF somewhere ?

    • Planning to check it with OpLev

  • OpLev (Shoda)

    • It is working well.
    • Need more whitening filters
  • Mirror orientation confirmation (Shoda)
    • Yaw orientation: seems OK
    • Transversal position: off by 1cm or so.
      • Even by moving the traverser, we could not completely cancel the offset. About 2mm remaining
      • Should check the location of the mirror with respect to the vacuum chamber. Use the 3D measurement system ? Ask Araki-san (an expert of the 3D measurement system) to come (Ohishi)
  • LVDT distributor problem
    • Connector for the coil driver input is D9 whereas the output from the HP coil driver is D15.
    • Make a conversion cable for the moment

    • 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)
  • Found the traverser components
  • IM is not yet finely aligned
  • Flag preparation status (Fabian)
    • Scratched 4 magnets and cleaned them.
  • Spare flag order status (Takahashi): Expected delivery date 1/22

• We need to secure things for water using Sunoko (duckboard). -> Everything is secured. The PR3 chamber is closed.

• Location of the EQ stop pillars (Takahashi)
  • Locations were reported by Takahashi

    • Interference with OpLev (Akutsu) -> Status ?

• Digital System (Okutomi, Fujii)
  • It is working fine currently
• BF Optimal Weight (Takahashi)

  • Check the optimal load for the ETM BFs at the ATC: Need to be done before the end of Jan. Arrange with ATC people (Takahashi) -> Sent an email to ATC people. Saito-san is available 1/5 - 1/7. Takahashi will fix the date.

  • Balast mass design: Incorporating Fabian's model to the assembly model. Now making a drawing. Should ask for quotation to companies first thing in the next year (Hirata)

• Traverser actuation check (Shoda)

  • PLC in the driver is not working. Will bring it back to Mitaka and replace it (Akutsu ?)

  • Traverser uses pin 5 of D-SUB9. But in air D-SUB9 cables in KAGRA have pin-5 grounded. -> Will change the pin assignment (Shoda)

• Traverser stop mechanism

  • Procurement status (Takahashi): Parts were delivered. Clean the parts on Monday (Hirata). -> Finished. Sent to Kamioka.

• Clean work procedure
  • A clean bag for PR returned from cleaning

  • 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)

  • Need to give the rotation angle of the traverser top plate (Aso)

• Cable status (Takahashi)
  • All the cables except for two cables were delivered. We have enough cables for iKAGRA.

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

    • 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 -> Contact Liu-kun and Kawamura-san for another shift (Takahashi)

  • 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.

• PR2 wire breaker problem (Mark, Tatsumi)

  • Removal of the wire breakers (Mark) -> Will ask for the status to Hirose-san and Mark (Aso)

  • Tatsumi prepared samples for for the removal test

  • SUS wire breaker order status -> Ordered. Delivery date: asking the company (Takahashi).

  • What should be done other than the removal of the prism ?
    • What was wrong
      • Gave up to polish the surface because of the delivery time.
      • It is difficult to pin point the cause.
      • Size is important.
    • For BS prisms, should we ask the company which made LIGO prisms ?

      • We should first ask LIGO about the company (Mark ?)

      • Compare the size of the prisms of LIGO and KAGRA (Mark ?)

    • 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. -> Working on it. Will finish it on 1/4.

  • Will wash Tungsten wire delivery status -> Delivered. Will wipe in the next week -> Working on it. Will finish it on 1/4.

• Production of additional PR winches (Akutsu)
  • 650um Tungsten wire test with 9.2kg is fine

  • Will test with 200um wires on Monday (7.2kg) with improved mass clamps (Hirata). -> Successful.

  • The next step is to ship to Kamioka (Takahashi, Hirata)

• RM compensation mass
  • Need to buy screws for fixing the compensation masses.

    • We have M6 SUS screws in stock. Fabian will discuss with Takahashi-san and show the final lengths of the screws.

• PR Optical Bench (Akutsu)
  • For PR2, we do need to raise the optical bench.
    • Delivery date for the screws: Dec. 21
    • PR2 vacuum installation will be Jan. 19
• 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) -> not yet.

• 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) -> Got a quotation. Will order soon.

  • Signal generators for LVDTs (Aso) -> Asking for quotation

  • 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.

  • Turn backles (bigger and eye). Smaller shackles. (Aso) -> TBD

• Next week (from 1/4) plan
  • Test hanging

    • Mon: Transfer function measurement with OpLev.

    • Tue: Measurement of the mirror position with respect to the chamber
    • Wed: Measurement of the mirror position with respect to the chamber
    • Thu: Traverser check ?
    • Fri: F2F@Mitaka
  • PR2
    • Mon: Rearrange the outside of the PR2 area
    • Tue: Rearrange the outside of the PR2 area
    • Wed: Rearrange the outside of the PR2 area
    • Thu: Rearrange the outside of the PR2 area
    • Fri: F2F@Mitaka
    • Mark will work on the PR2 glue removal. Fabian will work on the BS mechanical design.
    • Will work on the IM alignment and traverser assembly on the next week
• Travel (Week of 1/4)
  • Takahashi: Tue-Thu
  • Shoda: Mon-Thu
  • Mark:
  • Fabian:
  • Okutomi: Mon-Tue (available)
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 1/11)
  • Takahashi: Tue-Fri
  • Shoda: Tue-Fri
  • Mark:

  • Fabian:Tue-Fri

  • 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

• ETM assembly frame (Aso)
  • Ordering in progress
• End station is 3km away

Other

• bKAGRA preparation

  • List of tasks for: BS, Type-A, Type-Bp modification, IMMT (Takahashi). Takahashi prepared an item list. Will compile the list into a task list and send it to VIS a few days before the F2F meeting.

  • Set up a Wiki page (Aso)
• Electronics
  • Electronics diagram and review

    • Aso will make a template drawing and send it to Takahashi

  • What are necessary in the next few weeks ?
    • We will discuss it at every VIS meeting
• 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.-> not yet. Will make one in the first week of Jan.

  • 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) -> Asking for quotation.

    • How to test it ?

      • Use the unused assembly frame for Type-B ? -> Takahashi will make a plan.

• Safety at the site (Takahashi, Ishizaki)
  • A long rod for opening the ceiling of the clean booth was on the 2F floor and Fabian accidentally kicked it.
  • Small items were put on the 2F which can fall off through the threads. Use trays.
  • Steps arrived
  • Inner helmets for the clean suits delivered

Next meeting

2015/1/8 (Fri) 13:30 - F2F@Mitaka