VIS Meeting on 2016/6/3

2016/6/3 13:30 -

Room 210

Participants:

Overall Schedule

• The current overall schedule chart.

iKAGRA related activities

PR3

• PR3 post-run work status (Fujii)

bKAGRA preparation

Important Issues

• Meeting format (Aso)
• Site check for the preparation of Type-A installation (Aso)

• BS dummy mirror design (Mark)

• Accelerometers for IP
  

  • Is Geophone too noisy for innertial damping in Kamioka ? (Shoda) Slides

  • NIKHEF accelerometers for BS
    • Test status (Fujii)
  • #Which accelerometers for SR ?
    • # Buy from NIKHEF ? How much is the cost ?
    • # Get the design from NIKHEF and produce them in Japan (ATC) ?

• Pre-isolator assembly and tests
  

  • What is the plan for SR Type-B

  • Takahashi and Mark will start the discussion on, where, who, when -> continue.

• Bottom filter local sensor/actuator for Type-A

  • Where to start
    

    • Start from checking the space available for the sensor/actuators (Sato)

  • #Fix EQ stop at the bottom: modify the design of the bottom part of the EQ stop to be tightly fit into the tube (Ishizaki)

• Dummy payload design for Type-A
  

  • SEO is now considering if we can use the iKAGRA ETMs for this.
• Bottom Filter LVDT
  • Virgo people wants to produce ones for us.
  • Status ? (Raffaele)
• Assembly frames
  • We need to combine things into one contract

  • Type-B assembly frame: order immediately (Takahashi)

Common Issues

• Wide OSEM production (Akutsu)
  • Flexible circuit status ?

Electronics

• What are necessary in the next few weeks ?
  

  • The latest list
• Watch dog system (Tanaka)
  • photo-MOS relay switch resistance fluctuation
    • Noise requirement for the resistance fluctuation is necessary (Aso)
      • If we require the resistance noise to be smaller than DAC noise, the allowed fluctuation is 10^-7 Ohm/sqrt(Hz)@10Hz.
      • Asking Michimua-kun to calculate the requirements from the suspension response.

    • Tanaka measured the photo-MOS relay resistance fluctuation-> 37mOhm RMS upper limit

      • Will make spectrum of the resistance fluctuation.

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

• Type B Past Week Summary
  • Fabian prepared a work space in the ATC cleanroom and moved in nearly all the parts for the dummy BS, RM, IM and IRM.

  • Fabian finally got perfect agreement between the Mathematica and Matlab models of the BS. (The wire thicknesses had in µm instead of mm, leading to some modes off by 1E3.) See FabianMathMat20160526.pdf.

  • Hirata-san remeasured the SF for the BS. He noted that the cap went on and came off easily (unlike some other filters) - good news. He also confirmed the blade configuration (which was different from in Inventor, but should not cause issues with the assembly frame).
  • Hirata-san worked on final details of the Mirapro order for the assembly frame.
  • Hirata-san and Takahashi-san washed a large batch of parts.
  • Tatsumi-san will glue flags, sapphire primary prisms and metal secondary prisms to the dummy BS some time in the week of 6/8. Fabian and possibly Mark and/or Hirata-san will travel to ICRR to help and observe.

  • Mark worked more on E1504235 BS Assembly Procedure (Draft on OneDrive)

• Discussions

  • Crane will not be available on 13-14 of June.

  • Review: fix the date (Mark)

  • Measurement of iKAGRA BS position will be done in the second week of June. Then it will be taken out of the chamber after that (Ohishi)
• IM, RM, IRM, dummy BS assembly
  • Fabian prepared space in the clean room used for the SF assembly and moved in nearly all parts.
  • Still need to find SDC-treated hook for maraging wire in IM.
  • Will start assembly 5/30
• Wires

  • Fabian continued analysis of RM wire thickness versus mode frequency: link, another link,yet another link (From last week: T1605106 /draft)

• Can we make SR wire breakers bigger?
  • Fukushima-san has not yet started the work. He will start soon (as of 5/27).
• Flags, Metal Prisms, Sapphire prisms RECEIVED
• Mirror box (Tatsumi)
  • Tatsumi-san is planning to use mirror box to put flags etc on dummy BS the week of 6/8. Fabian+1 will help/observe.
• An extra structure attached to the EQ stop to prevent tipping over of the BS.
  • Will consider if we can make it to the test hanging. But not critical for the test hanging.
  • No action since last week.
• Not enough crane height problem (Hirata, Saito)
  • No action since last week
• EQ stop screws, extensions and lock nuts RECEIVED
• Ballast masses for payload
  • Initial batch received - ordered extra smaller ones to allow for adjustments.
• Lower breadboard stuff
  • Assembly procedure

    • Need to be incorporated into the procedure document. Discuss with Takahashi (Mark)

  • Breadboard spring bases and associated cable clamps RECEIVED
  • Breadboard springs (in manufacture)
  • Damper ring mods RECEIVED
  • Nail-head parts: quote from Mirapro received, not urgent, will be combined with assembly frame order.
• BS Assembly Frame Design (Mark, Hirata)
  • Final assembly frame quote received; is being extended to included lower breadboard part modifications.
• Clean bag
  • Ordered - expected 6/8.
• 2D and 3D CAD

  • E1605035 VIS Document and Drawing Tree (BS)

• Electronics

  • JGW-D1503600 - BS Suspension Cabling

  • E1605111 BS Suspension Electronic Items List

  • D1503901 In-Vacuum Cable Detail

  • Item list and timetable was given to Miyakawa-san - some corrections received and added to schematic but not yet posted.
  • Status on AEL boxes OK according to Miyakawa-san.
  • Signal generator and cable to be used for BS test. May order NIKHEF cards later if concern about AC-driven units in racks.
  • Need to get new longer versions of some previously ordered BF-PI and SF-PI cables (Takahashi).
  • Need to check previously ordered TM-BF and IM-BF OSEM cables have been flipped (Takahashi).
  • Decided to hand-make cables for geophones because previously ordered cables have no conductor on pin 5.

  • Stepper drive box (requested by Sekiguchi-san T1503385) is being designed, should be ready in time.

• Procedure documents

  • Mark worked on BS Assembly Procedure E1504235 draft

Type A

• Task list (Takahashi)

• Clean booth design for 2F https://www.dropbox.com/s/8bi9ij91radmpt5/IXYV160512.pdf?dl=0

  • Sketch

  • Ask Miyoki-san to add cable racks(Takahashi)

• Prototype test of the EQ stop
  • Will do the test in ATC
  • EQ stop and assembly frame prototype were shipped to Mitaka
  • Will start the preparation from the next week
• Sensors to monitor the release of the SFs from the EQ stop.

  • Design

• #The test of prototype long maraging rod was finished
  • Will order them with maraging rods for the cryogenic payload early July. The lead time is 2 months.
• Type-B Standard Filters preparation
  • 6th SF measurements were done ?

  • Shipped the SF for BS to Mitaka.-> The measurement will be done in the next week.

  • Ship the measured Type-B SFs to Kamioka soon.
• Type-A SF preparation

  • Needs to cut more finshing rod blades -> ATC is working on it now.

• The next Type-A meeting will be on 6/9.
• #Simultion (Okutomi)
• #Local sensors for BF

Type-Bp modification

• #Modification for bKAGRA
  • wiki
  • Design work by Saito-san @ ATC

    • First draft is provided. -> Under checking

    • First draft of the installation procedure & Checking if there is any conflict (Fujii)

  • Still waiting for the LVDT design from Virgo
  • Full CAD model of the original Type-Bp is under construction (Shoda)
• A/I till next week
  • First draft of the installation procedure (Fujii)
  • Full CAD model of the original Type-Bp and the new Type-Bp (Shoda)

Site work plan for the next week

• Mon:
• Tue:
• Wed:
• Thu:
• Fri:

BS crane will not be available: 13th -14th of June

Travel Plans

• Travel (Week of 6/6)
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
  • Sato:
• Travel (Week of 6/13):
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Mark is away: July 8-20

Other

• Safety:no incident

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

Next meeting

2016/6/10(Fri) 13:30 -

Next VIS F2F 6/17

Next next F2F 7/8