VIS Meeting on 2016/5/13

2016/5/13 13:30 -

Room 210

Participants:

Overall Schedule

• The current overall schedule chart.

iKAGRA related activities

PR3

• PR3 post-run work status & plan (Shoda)

  • 5/9, 10: PR3 current status check
  • 5/16: measurement of PR3 mirror position relative to the vacuum tank

  • 5/17: OpLev wind shield test?, Inner frame status check.

  • 5/18: Extended chief meeting
  • 5/19, 20: Evacuation

iKAGRA ETM suspension

• Uninstallation status (Ohishi)
  • Mirrors were shipped to Mitaka ?

bKAGRA preparation

Important Issues

• Length sensing OpLev

  • #In order to test this with the BS test haning, we want to have wide OSEMs as witness sensors on the mirror.
  • #Stab-flag and tipped flag are both in quotation. We will order both. The gluing jigs will be the same.

  • Who will design and prepare the BS length sensing OpLev ?

• What shall we do with PR2

  • PR2 chamber has only one viewport avaibale at 45deg. angle for OpLev

  • Original idea: Put a reflecting mirror on the bread board and monitor the rotation of the bread board with another OpLev.

    • No length sensing

    • Two OpLevs needed

  • Another idea: Introduce the light with a fiber into the vacuum chamber to form a one-way 45deg. OpLev for length sensing.

    • Length sensing possible
    • Affected by the vacuum chamber tilt (if we mount the fiber collimator to the inner frame, the tilt will be less).
    • Need to find a place to mount the fiber collimator inside the vacuum chamber
  • Will continue to discuss the configuration.
• Suspended bread board
  • #Many critical components will be installed on it (baffles, steering mirrors for the green injection etc)
  • We have to make sure that the bread board suspension is properly damped
    • Takahashi checked Sekiguchi thesis

    • Looks like we can estimate the damping force from his experimental results. Takahashi will calculate the necessary number of magnets.

• Accelerometers for IP
  • Geophone is too noisy for innertial damping in Kamioka
  • TAMA SAS accelerometers for Type-A
  • NIKHEF accelerometers for BS ?
  • 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 ?
• Bottom filter local sensor for Type-A
  • What is the plan ?
• #Dummy payload design for Type-A

Common Issues

• Wide OSEM production (Akutsu)
  • For BS test hanging, we need the wider version by mid-to-late June.

Electronics

• What are necessary in the next few weeks ?
  • We need to count the number of necessary circuits for Type-A and Type-Bp, so that we can tell AEL the total number necessary for VIS.

  • Make a list by the end of May (Shoda, Takahashi)

• Watch dog system (Tanaka)
  • photo-MOS relay switch resistance fluctuation

    • Noise requirement for the resistance fluctuation is necessary (Aso)

    • Tanaka will measure the photo-MOS relay resistance fluctuation

  • #DC-DC convertor: check the operation frequency (Tanaka)

  • #The next step: Make a prototype with slow shutdown mechanism

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

• Past Week Summary
  • Flags and metal prisms ordered; expected 5/31.

  • New assembly drawing D1605179 focussing on items not part of main chain (and associated screws):

    • Crane adapter
    • Lower breadboard blade module (with cable clamps)

    • IM-RM safety bar (D1605127 from last week now obsolete)

  • 3D assembly changed to have geophones instead of accelerometers (but SRx will probably be per original design - need to revisit circuit diagram)

  • Concept for load gauge adapter decided (reuse crane adapter plate and jacks from below PI; add Misumi crossbars, cleanroom-compatible chain hoist: Crane Frame.pdf)

  • Concept for second floor of clean booth decided (remove all floor panels; add bridge panels at right angles: BS Cleanbooth.pdf)

  • Modified drawings for main assembly frame and drawings for most small parts (jack adapters etc) received from Mirapro.
  • Wire sizes decided: 300 µm piano wire and 500 µm tungsten (will revisit this later).

  • Lots of work by Fabian on E1604817 ( Draft on OneDrive) and E1504235 (IM and RM assembly sections now finished)

  • Lots of work by Mark on Draft on OneDrive)

  • Hirata-san measured another SF.
• IM assembly
  • Planning to do it in ATC. Use the clean room used for the SF assembly.
• 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 preparing test: 3/4/2016 + "1 month" = ≈4/1/2016, not ready as of 4/8.-> Takahashi will ask the status.

• Flags, Prisms

  • D1605087, D1605088, D1605112

  • Revised quote for IM and BS flags and metal prisms received (will be ordered Monday).
• BS dummy optic

  • Ordered, expected ≈4/22 (T1604811)

  • Decided to have it shipped to Mitaka for initial assembly and give it to Tatsumi-san for prisms/flags.
• Mirror box (Tatsumi)
  • Tatsumi-san has ordered modifications to mirror box for final flags and prisms.
• 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 (in manufacture - promised for 4/22)
• Ballast masses for payload

  • Hirata-san created drawings DropBox link

  • Drawings were checked by Mark, not yet ordered.
• Lower breadboard stuff
  • Breadboard spring bases and associated cable clamps (in manufacture, expected 4/15)
  • Breadboard springs (in manufacture)
  • Damper ring mods (in manufacture, expected 4/28)
  • Nail-head parts: quote from Mirapro received, not urgent, will be combined with assembly frame order.
• BS Assembly Frame Design (Mark, Hirata)
  • Hirata-san did new Inventor assembly with Mirapro's initial design plus various improvements including clean bag supports.
• Clean bag
  • Ordered - expected 6/8.
• 2D and 3D CAD

  • E1605035 VIS Document and Drawing Tree (BS)

  • BS 3D Assembly
    • 3D CAD for BS assembly frame revised.
• 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.
  • Need to order LVDT oscillator cards from NIKHEF (Takahashi) and have a signal generator and cable in the meantime (Mark).
  • 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)

• Doing the TF+IP assembly and control test in Mitaka ?
  • The clean booths for EXV and EYV will be completed by the end of September. The pre-isolators will be assembled in the clean booth from October.
    • Necessary time for the mechanical assembly and cabling is short (Joris alone was able to finish it in 1 week in the tunnel).
    • We cannot load the pre-isolator with the final weight (too much to be put on the pre-isolator). Therefore, the tests to be done with the assembled pre-isolator is a basic check of the sensors and actuators. Even if we pre-assemble the system in Mitaka, we need to do this check in Kamioka again.
    • In the end, there will be no gain in time by doing the assembly in Mitaka.
• The next Type-A meeting will be on 5/12.
• Prototype test
  • TAMA west end chamber is now being considered as the test site.
• 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-A Filters Optimal Load Measurements

  • 5 SF measurements were done. http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5105

  • The shell of the 2 filters were too tight. Were able to open but could not close one of them.
    • The ones we cannot close the shell, we can use them for the Type-Bp.
  • We need to make the blade for fishing rods of Type-A.
• Simultion (Okutomi)
  • Simulink part is now working but some debugging is going on.
• Local sensors for BF

  • Need to be included in the task list (Takahashi)

Type-Bp modification

• #Traverser motor driver (Shoda)
  • Need a box for stepping motor driver. Miyakawa-san is thinking about ordering chassis and boxes for motors. We discussed and agreed that the design of the boxes will be unified. The boxes will be designed and ordered together with those. (16/03/10)
  • Miyakawa-san received the Traverser motor driver.

    • -> Decided the Traverser motor driver as it is because the wiring is too complecated for the mass production, but we need only 3 Traverser motor drivers.

    • -> We will keep the current design.

• Modification for bKAGRA
  • wiki
  • Type-Bp will go with the BF modification plan.

    • Thanks to Akutsu-san, asked the ATC people for the help for the design -> S. Saito-san will help us constructing the 3D/2D model.

    • -> Shoda gave him a Type-Bp 3D model with the possible sensor-actuator position.

• A/I
  • Study on the sensor-actuator. (Small LVDTs of OSEMs)
    • Important characteristics: Size, senosor noise, actuator coupling to the ground vibration.

Site work plan for the next week

• Mon:PR3 measurements, IP

• Tue: PR3 measurements, IP
• Wed: Extended Chief Meeting
• Thu: PR3 measurements, IP
• Fri: PR3 vacuum evacuation, IP

Travel Plans

• Travel (Week of 5/16)
  • Takahashi: 17-20 (chief meeting and IP)

  • Shoda:16-20 (PR3)

  • Mark:
  • Fabian:

  • Okutomi:16-20 (PR3)

  • Fujii:16-20 (IP)

  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 5/23):
  • Takahashi:
  • Shoda: Elba
  • Mark:
  • Fabian:
  • Okutomi: Elba
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Mark is away: July 8-20

Other

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

Next meeting

2016/5/20(Fri) 13:30 -