VIS Meeting on 2016/5/27

2016/5/27 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

• 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
    • Damping effect depends on the ratio of mass and resonant frequency. Estimated effect was 0.45 for the experiments. The number of magnets needed in the same condition is about half.

    • 30 magnets necessary for the gap of 5mm -> need to update the calculation for the double pendulum case (Takahashi)

• Accelerometers for IP
  

  • Is Geophone too noisy for innertial damping in Kamioka ? (Shoda)
  • 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
  • Any progress ?
    • What is the space available for the sensors/actuators ?
  • Fix EQ stop at the bottom: modify the design of the bottom part of the EQ stop to be tightly fit into the tube.
• Dummy payload design for Type-A
  • Okutomi-kun is assigned.

  • Okutomi will make schematic design. One of the engineers will make drawings. Report more detailed plan by the next week (Takahashi).

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

  • Optical design will be discussed in Optics Meeting.
• What shall we do with PR2

  • Fixing an OpLev component on the inner frame seems possible (Akutsu)

Electronics

• What are necessary in the next few weeks ?
  

  • Make a list of VIS electronics by the end of May (Shoda, Takahashi) -> List

    • Presented the list to AEL. Miyakawa-san agreed.
    • Need to update the list to include IMMT
    • Discuss how many spares to make at the next AEL meeting
• Watch dog system (Tanaka)
  • Wants to do tests with the existing PR3 sometime in fall ? Need coordination.
  • 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.

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

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

• Past Week Summary
  • Fabian did inventory of parts/fasteners for dummy BS, RM, IM and IRM - almost all at Mitaka. A handful (picos, pico drivers) will be brought back from Kamioka.
  • Fabian continued work on Mathematica and Matlab models of the BS and control system. He now gets much better agreement after correcting discrepancies between the parameter sets.
  • Hirata-san worked on:
    • Checking Mirapro assembly frame drawings
    • Ordering missing screws and small items (screws for dummy mass, fine pitch M8 for RM)
    • Work platforms and clean booth second floor arrangement.

    • Load gauge adapter and associated parts

    • Possible fall-back plans for the rods connecting the security structure to the PI.
    • Design for additional IM trim masses (existing design had one mass per corner and no provision for adding/removing).

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

  • Mark designed a guide part to help place the PI accurately onto the security structure.

• Discussions
• IM assembly
  • Planning to do it in ATC. Use the clean room used for the SF assembly.
  • Fabian made an inventory. Most parts are ready.
• 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, Metal Prisms
  • IM and BS flags and metal prisms ordered; expected 5/31
• Sapphire Prisms - expected 6/5
• 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
  • Initial batch received - need to design and order smaller ones to allow for adjustments
• Lower breadboard stuff

  • Assembly procedure ?

  • 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)
  • 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
    • Load frame adapter added
• 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

  • Ask Miyoki-san to add cable racks
• 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
• Sensors to monitor the release of the SFs from the EQ stop.
  • Now considering to use some touch sensors
  • Will test this sensor in the prototype 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
  • 6th SF measurements were done ?
  • Shipped the SF for BS to Mitaka.
  • Ship the measured SFs to Kamioka at an apropriate time
• 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 5/26.
• Simultion (Okutomi)
• #Local sensors for BF

Type-Bp modification

• Modification for bKAGRA
  • wiki
  • Discussing with Saito-san of ATC
    • Specified what can be modified
    • Asked to fix the EQ stop to the traverser
  • Asked Fujii-kun to work on the noise requirements for the BF sensor/actuator
  • Still waiting for the LVDT design from Virgo
  • Full CAD model of the original Type-Bp needs to be created

Site work plan for the next week

• Mon:
• Tue:
• Wed:
• Thu:
• Fri:

Travel Plans

• Travel (Week of 5/30)
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
  • Sato:
• Travel (Week of 6/6):
  • 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

2016/6/3(Fri) 13:30 -

Next VIS F2F 6/10 ?