• KAGRA
• Subgroups
• VIS
• VISMinutes20160408

VIS Meeting on 2016/4/8

2016/4/8 13:30 -

Room 210 & eZuce

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

Schedule

• #Schedule status (Aso)
• #Will have a schedule meeting with Ando-san on April 15th in Kamioka (Takahashi, Mark, Shoda will come)

iKAGRA related activities

PR3

• PR3 Operation Status (Aso)

  • The fuse of the k1pr0 I/O chassis tripped again　-> The power supply was replaced.

    • BIO board was installed to k1pr0 taking this opportunity.
    • Wrong cabling was fixed
  • PR3 commissioning (LVDT feedback off-load, tilt-meter (Shoda)
    • LVDT off load with fishing rod was done using the USB connection.
    • The tilt meter could not be installed because of the insufficient space. Will use the relative position of IM and IRM as a tilt sensor.
• Traverser and Stepper motor remote control (Shoda):
  • Aso will send a stepper motor driver from Kamioka to Mitaka for test.

iKAGRA ETM suspension

• Current status (Ohishi)
  • We were assuming wrong coil polarization for test mass actuation. This was fixed and the actuation range increased by 16 times.

  • In order to cope with the extended actuation range, the OpLev was modified to a double pass configuration.

Electronics

• What are necessary in the next few weeks ?

  • Mark worked on JGW-D1503600 - BS Suspension Cabling - main thing we definitely don't have is stepper driver boxes (still being designed).

    • Ask Miyaka-san the status(Mark)

  • Notify Miyakawa-san what and how many circuits are necessary by when (Mark)

• Watch dog system (Tanaka)

  • Graceful shutdown mechanism

  • Check when is the next AEL meeting (Aso)

• #Electronics diagram and review

  • #Electronics document tree for VIS by Mark (E1604937)

  • #Updated PR3 schematic with OpLev wiring (D1604795)

  • #Who will manage the electronics of each suspension
    • Type-Bp will be controlled by Shoda but the diagram update will be done by Mark
    • Type-A may be maintained by a new engineer. Sould be discussed with the person before April .
  • #We need to count electronics and cables needed for the tests, such as temporary sensors and so on.

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

• Policy of the screw types to be used (Mark, Fabian) E1605107 (draft)

• Reflection type local sensor (Akutsu)

  • Test widening the opening next week (Akutsu) -> report

  • Continue to work on how to fit the reflective sensor into the current coil bobbin (Akutsu)
• 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

  • Mark worked on JGW-D1503600 - BS Suspension Cabling

  • Mark wrote assembly frame requirements doc for Mirapro: E1605037

  • Mark checked Hirata-san's assembly drawings and re-checked again after corrections; Hirata-san is now working on obtaining fasteners:

    • D1503444, D1503445, D1503446, D1605028

  • Takahashi-san checked Hirata-san's drawings for BS and IM flags (two designs each) and is ordering them: D1503487, D1605087, D1605088, ?? - not yet posted)

  • Hirata-san got quote on BS clamp modifications - being ordered to arrive 4/22.

  • Fabian finished analysis of wire thickness and wrote report: T1605106 (draft)

  • Fabian wrote up the policy on coating/venting of screws: E1605107 Fabian's screw policy (draft)

• Wires

  • Fabian's report T1605106 (draft)

  • Rahul pointed out that 200 µm wire was not enough for BS (chosen for PR, not rethought).
  • Fabian checked and recommends 300 µm piano wire (available from Nilaco, 4.5 safety factor)
  • See document for more on RM wires for BS and PR/SR
    • Need to consider the coupling of the TM or RM motion with IM so that we can damp the modes with IM.
• BS prism preparation
  • 6 prisms were ordered, to arrive just after Golden Week. Prisms will be polished and cut parallel to the c (rather than a) axis for strength. Size will be 5 mm for compatibility with SR.
• Can we make SR wire breakers bigger?

  • Fukushima-san preparing test: 3/4/2016 + 1 month = ≈4/1/2016 -> Hirata-san and Takahashi-san talking to ATC 4/8 morning.

• Flag design

  • BS Flag Redesign on OneDrive

  • Drawings done (but not posted): D1503487, D1605087, D1605088, ??)

  • Takahashi-san ordering
  • 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!
• BS dummy optic
  • Ordered, expected ≈4/22

  • T1604811

• BS dummy and secondary prisms
  • Dummy prisms will be 5 mm to match SR - need to adjust BS clamp blocks.
  • Mark trying to find out from Tatsumi-san what height of prism is assumed by current jig.
• EQ stop screws, extensions and lock nuts (in manufacture - promised for 4/22)
• BS Clamp Mods
  • Hirata-san finalized details with IJECT. Order pending, 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 yet ordered
• BS Assembly Frame Design (Mark, Hirata)

  • Mark, Hirata-san, Takahashi-san met with Mirapro 4/1 and presented E1605037 BS Assembly Frame Requirements

  • Quote received
• Clean bag
  • Needs to be ordered soon. Mark will make a design. Aso will contact the company.
  • No action since last week
• 2D and 3D CAD
  • Individual mass assemblies for payload all done.
  • BS 3D Assembly
    • Needs updates for BF and SF blade spring configuration.
• Electronics

  • Mark worked on JGW-D1503600 - BS Suspension Cabling adding rack cabling

  • Need to inform Miyakawa-san of requirements and schedule

  • Need to get status on design of stepper drive box (requested by Sekiguchi-san T1503385)

• Procedure documents
  • No action since last week
• Mirror box (Tatsumi)
  • Mirror box exists but Tatsumi-san has a list of modifications he'd like to make.
  • Need to get clarity on secondary prism size - 5 mm or 1.28.
  • Mirror box base will need holes to interface to hanging frame trolley. Tatsumi-san has agreed to do the mirror box trolley plate so that it will match the mirror box base plate. Hirata-san will design the rest of the hanging system and ask Mirapro to make it along with the assembly frame.
• Not enough crane height problem (Hirata, Saito)

Type A

• Task list (Takahashi)

• Prototype test
  

  • The prototype EQ stop was transported from Kashiwa to Kamioka on 31th March.

  • Assembly of the EQ stop prototype on 6-7 April next to the SR3 chamber. -> Found a lot of things to improve. Report by Okutomi.

    • Will redeisgn the EQ stops for the actual Type-A suepsnions.
  • Demonstration of installation procedure using prototype filters (SFx1 + BFx2) from May
    • Use the prototype EQ stops with the old Type-B assembly frame
    • Clean booth construction for SR will start from July 1st.
    • The location will be between SR2 and SR3. Will talk with Saito-san if this plan is OK or not on 4/15 (Takahashi)
• The next Type-A meeting will be on 4/14.

• The test of prototype long maraging rod was started. Detail is here: http://klog.icrr.u-tokyo.ac.jp/osl/index.php?r=1185

  • Load dependence was measured using a laser position sensor. Extension of 2.84mm was observed for the load of 272.8kg. The extension is consistent with the calculation (2.75mm).
• Maraging rod preparation status
  • 2 sets for magnetic dampers are missing
  • 4 long maraging rods will
• Care on the humidity should be taken to store maraging steel to avoid cracking noise.
• Type-A Filters Optimal Load Measurements

  • Started the measurements and installation of fishing rods: report

• Simultion (Okutomi)
  • Simulation with a dummy payload (report)
  • Will update the seismic noise data.
  • Need to implement the damping control part to see the damped RMS.
  • Ballast masses for the top filter may interfere with the magic wands.
    • Need to check how many ballast masses are necessaryfor Type-B and see if they interfere (Mark). If so we need to modify the mass like making some cuts.

Type-Bp modification

• This Week
  • Working on the CAD model and control simulation of BF modification (Shoda)
  • Details will be reported at the next meeting.
• 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 wants to have a driver and a motor to test
    • Will give them to MIyakawa-san when Shoda-san come to Kamioka for the shifts

      • -> Done (3/28)

      • Shoda is also asking Uraguchi-san to provide one more Traverser motor driver for the test.
• Modification for bKAGRA

  • wiki

    • Uraguchi-san proposed us the new IP plan
    • Shoda updated the proposal(concerns?) for the BF active damping plan
  • Action items for Type-Bp modification

    • Calculate the upper limit of the resonant fequency for IP (Fujii): MeetingMemo

    • Check if we need the magnetic damper for the bottom filter (Fujii): MeetingMemo

      • Either the MD is used or the resonant frequency of the IP should be matched with the whole chain resonance.

    • Check the mass of the bottom plate and the cap of the standard filter -> Send Uraguchi-san (Shoda)

      • -> Done (3/31)

    • Check structure analysis of the EQ stop for active damping on BF (Shoda)
    • Check the minimam weight we need for the BFRM in order to damp the resonance enough (Shoda)
    • Check the capability to modify the BF cap (Shoda)

      • We want the correct CAD model for the original Type-Bp

      • The BF and SF designs are the same for Bp and B except for the blades. So the effort to make correct CAD models for those filters can be unified between the two teams. Hirata-san with help from Shoda-san will work to make correct CAD models.
  • Will have a meeting with Virgo people sometime soon. Then have a review for Type-Bp

Site work plan for the next week

• Mon:
• Tue:
• Wed:
• Thu:
• Fri:

Travel Plans

• Travel (Week of 4/11)

  • Takahashi:15(Schedule Meeting)

  • Shoda:15 (Schedule Meeting)

  • Mark:15 (Schedule Meeting)

  • Fabian:

  • Okutomi:11-14 (Shift)

  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 4/18)

  • Takahashi:23-25 (Shift)

  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Other

• Safety
  • No incident
• #GAS blade inspection by Virgo (Takahashi)
  • Shipped the blades. Will get results in 1-2 months.

Next meeting

2016/4/15 (Fri) 13:30 -