• KAGRA
• Subgroups
• VIS
• VISMinutes20160422

VIS Meeting on 2016/4/22

2016/4/22 13:30 -

Room 210 & eZuce

Participants:Takahashi, Sato, Hirata, Ishizaki, Tanaka, Okutomi, Mark, Shoda, Fujii, Fabian, Aso, Akutsu

Schedule

• The current overall schedule chart.

iKAGRA related activities

PR3

• PR3 Operation Status (Aso)
• PR3 post-run work schedule (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?

  • 5/18: Inner frame status check
  • 5/19, 20: Evacuation

iKAGRA ETM suspension

• Current status (Ohishi)
  • Picomotor trouble in ETMX ?
• Actuator efficiency calibration (Aso)

  • Note

Electronics

• What are necessary in the next few weeks ?

  • Got feedback from Miyakawa-san on BS schematics and item list (JGW-D1503600, E1605111) and status - there should be enough of the boxes AEL is supplying.

    • Takahashi-san asked NIKHEF about oscillator cards for LVDT chassis; 3-4 months lead time; 2MJPY for 20 board. It is too expensive. We will use commercial oscillators for the moment (one oscillator per rack is enough). If we need to get rid of AC, we will consider to buy the oscillator boards from NIKHEF.
    • #Micro-D-SUB connector cables for OSEM: we will use the same pin-out as the PR3. Akutsu-kun will fix the labels on the silk for the flexible circuit when he remakes them.
• Watch dog system (Tanaka)

  • Graceful shutdown mechanism

  • Graceful shutdown experiments

  • Gave a presentation at the next AEL meeting on 4/18
  • 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

• Electronics diagram
  • Assignment is decided as follows
    • Type-A: Sato
    • Type-B: Mark
    • Type-Bp: Mark will modify the Type-B diagrams at the request of Shoda

bKAGRA preparation

• Three big categories of the tasks
  • Type-A: Leader = Takahashi, Okutomi, Ishizaki, a new engineer
  • Type-B (BS and SRC): Leader = Mark, Fabian, Hirata
  • Type-Bp modification: Leader = Shoda, Fujii, A new technician (?)

Common Issues

• OSEM modification

  • Do we need wide OSEMs for IMs ? -> Discuss at the next meeting

• Do we need OSEM on the mirror or not

  • Decision: No. We will not have OSEM flags on the mirrors.

• Length sensing OpLev

  • Organize a meeting with Ettore and Paolo for the length sensing OpLev (Raffaele)

• What shall we do with PR2

  • PR2 has only folding OpLev

    • Check the configuration (Raffaele, Akutsu)

      • Drawing (Hirata)

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

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

  • 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 will check Sekiguchi-kun's calculations and see if we can estimate the damping force of the bread board damper

• #OSEM assembly (Akutsu)
  • #Schedule for each suspension is now given to Akutsu-kun

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

• Past Week Summary
  • Hirata-san produced a near-final Inventor assembly of the BS on the assembly frame, for use in writing the assembly procedure.
    • Includes assembly frame modifications suggested by Mirapro, including feet, wheels, lifting eyes, thicker crossbars under BF, IM etc.
    • Includes final rail system except for interface plate to mirror box.
    • Includes full PI with ballast masses.
    • Includes cable clamps.
    • Includes correct versions of BF and SF.
    • Includes new BF pushrod parts to work around different placement of blade screws in new version of BF.
    • Includes cleanbag support bars.
    • Includes key parts of mirror box (enough to check for interference) - needs more work.
    • Does not include various invisible duplicate assemblies that had been present due to cut and paste.
  • After a few more improvements, the new assembly will be sent back to Mirapro.

  • Got feedback from Miyakawa-san on schematics and item list (JGW-D1503600, E1605111) and status of AEL items - there should be enough.

  • Cleanbag design was finalized; Takahashi-san ordered: 160419-ﾁｬﾝﾊﾞｰｶﾊﾞｰⅡ型.pdf

  • Quote for flags and prisms was received, but expensive - may drop rigid flag design.-> Go with the self-assembly one for the hanging test and see how it works.

  • Mark/Hirata met with Tatsumi-san re mirror box; will require only very minor modifications for flags and prisms; Tatsumi-san will arrange immediately.
  • Fabian worked on understanding Sekiguchi-san's control design to help decide optimum wire thickness.
  • Mark worked on install procedure and schedule.
  • Takahashi-san enquired with NIKHEF about oscillator cards for LVDT chassis - lead time would be 3-4 months.
  • Hirata-san measured another filter at ATC.
• 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.
• Flag design

  • D1605087, D1605088, D1605112

  • Quote received (part of quote for flags/prisms)

  • IM flags very expensive; Takahashi-san wants to order only one; drop rigid design? -> Yes

    • We will go with the self-assembly type flags for the BS test assembly. If there is a problem with it, we will order the rigid ones. The lead time is 3 weeks.
  • Widen the OSEM opening (Akutsu)
  • A new local length sensing
    • Need to decide the strategy for BS: three choices
      • Use OSEMs as originally planned

      • Use OpLev, No OSEM flag

      • Use reflection type sensors, No OSEM flag
    • Decide later!
• Prisms

  • D1605125

  • Quote for received (part of quote for flags/prisms)
• 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)
  • New prism and flag designs were given to Tatsumi-san. Only minor adjustments to the mirror box will be needed; Tatsumi-san will arrange.
• 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

  • Quote with final design received; Aso-san is ordering: 160419-ﾁｬﾝﾊﾞｰｶﾊﾞｰⅡ型.pdf

• 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
  • No action since last week

Type A

• Task list (Takahashi)

• Doing the TF+IP assembly and control test in Mitaka ?

  • Ask Miyakawa-san if there is a digital system we can borough from the site (Aso)

  • Ask Noguchi-san if there is any clean room available in ATC for this work (Akutsu)

    • Provide Akutsu-kun the necessary area for the work (Takahashi)

• The next Type-A meeting will be on 4/28.
• Prototype test
  • Presented a plan at the Type-A meeting.
  • More detail needs to be discussed (Takahashi, Okutomi)
• 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

  • 4 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.
  • Will start the measurement of the SFs for Type-A soon.
• 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
  • Requirement is re-considered.

    • Requirement of the residual RMS velocity for PR mirrors is 6.1 um/sec: slide

      • (assuming we will use the high power coil drivers for TM/IM OSEMs.)
      • RMS displacement should not be too large to avoid up-conversion of scattering noise

• 
  

  • Status of plan IP

    • Fujii wrote the assembly procedure of IP, and checked the equations about the legs, which is necessary for the design.Pre-isolation stage installation : JGW-G1605128

  • Status of plan BF
    • Simulation is updated
    • Support the mounting structure for the actuator/sensor from the traversor top plate (100kg maximum)
    • Suspend or rigidly mount the structure: doing simulations
    • Think about the sensor/actuator : check the available space
  • Action items for Type-Bp modification

  • Decision: We will focus on the BF modification plan from now on.

Site work plan for the next week

• Mon: IP work
• Tue: IP work

• Wed:IP work

• Thu:
• Fri:

Travel Plans

• Travel (Week of 4/25)

  • Takahashi:23-26 (Shift+IP work)

  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii: 25-28 (IP work)
  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 5/2): Golden Week
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Other

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

Next meeting

2016/5/6(Fri) 13:30 - (4/29 is a holiday)

Next F2F: 2016/5/13(Fri)@Mitaka