VIS Meeting on 2016/5/20

2016/5/20 13:30 -

Room 210

Participants:

Overall Schedule

• The current overall schedule chart.

iKAGRA related activities

PR3

• PR3 post-run work status (Shoda)
  • Planned works
    • 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

IP tests in Kamioka

• Status report (Fujii)
• Control test may be performed with the hanging test of BS
  • Ask Joris what is his intention and schedule (Raffaele)
  • Ask if we can perform the control test remotely (Aso)

bKAGRA preparation

Important Issues

• 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.-> by the next VIS meeting

• 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
  • Takahashi and Mark will start the discussion on, where, who, when.
• Bottom filter local sensor for Type-A

  • Tell SEO about the wider cross tube -> Wider tube is not possible

  • Fix EQ stop at the bottom ? -> This is possible

  • #EQ stop design should take into account of the sensor/actuator mounts.
  • #Use the same sensor/actuator as Type-Bp ?
  • #Sato-san is responsible for this part.
• #Dummy payload design for Type-A
  • Okutomi-kun is assigned.

Common Issues

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

  • Got cost estimates for the small parts. Will order for 20 OSEMs.
    

• 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 ? -> Ask Simon (Aso) -> in progress

• #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

      • See if we can find any mounting point on the inner frame (Akutsu) by the next next VIS meeting.

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)List

    • There are some uncertainties in the number of necessary circuits.
    • Make a list with ranges of numbers for uncertain things by the next VIS meeting (Takahashi). Then talk to AEL.
• Watch dog system (Tanaka)
  • photo-MOS relay switch resistance fluctuation

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

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

      • Will make spectrum of the resistance fluctuation.

  • DC-DC convertor noise check: quiter than a battery ?

  • #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 BS Payload Assembly Procedure ( Draft on OneDrive; (IM and RM assembly sections now finished)

  • Lots of work by Mark on E1504235 BS Assembly Procedure (Draft on OneDrive)

  • Hirata-san measured another SF.

• Discussions

  • Need more realistic schedule
  • Take into account the preparation of SR suspensions
  • SRM and PRM payloads need to be ordered.
• IM assembly
  • Planning to do it in ATC. Use the clean room used for the SF assembly.
  • Fabian will start the preparation from the next week.
• 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

  • IM and BS flags and metal prisms ordered; expected 5/31
• 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 again (seismometers changes to geophones).
• 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)

• Where to perform the TF+IP assembly ?
  • The large access door to the ATC clean room is not available until Octorber or November. Doing the assembly work in Mitaka is next to impossible.

• Prototype testof the EQ stop
  

  • Purpose of the test needs to be clarified to decide on where to perform the test.
• 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

  • 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.
  • Ship them to Kamioka
• Type-A SF preparation
  • Needs to cut more finshing rod blades.
• The next Type-A meeting will be on 5/26.
• #Simultion (Okutomi)
• #Local sensors for BF

Type-Bp modification

• Modification for bKAGRA
  • wiki
  • Discussing with ATC people for the mechanical modification.
    • Got some comments
  • Estimating the noise requirements for the BF sensor/actuator
  • Full CAD model of the original Type-Bp needs to be created

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:15-18 (PR3)

  • Fujii:17-20 (IP)

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

  • Fujii:23-27 (Accelerometer, PR3)

  • 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

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