• KAGRA
• Subgroups
• VIS
• VISMinutes20160325

VIS Meeting on 2016/3/25

2016/3/25 13:30 -

Room 210 & SeeVogh

Participants: Takahashi, Hirata, Ohishi, Barton, Pena, Okutomi, Shoda, Ishizaki, Flaminio, Fujii

Schedule

• Schedule status (Aso)

PR3

• PR3 Operation Status (Aso)
  • DAC problem persists

  • Sometimes, there are long large drifts together with MC mirrors. Floor drift ? http://klog.icrr.u-tokyo.ac.jp/osl/?r=1098

  • Drift due to GAS filter: Feedback control using LVDT-actuator was applied.

  • #Yaw picomotor does not work ? -> Try a manual pad control at some point.

• Traverser and Stepper motor remote control (Shoda): Not applied yet.

• Digital control for OpLev: DC serve is working.

Plan for the next week

• Mon:
• Tue:
• Wed:
• Thu:
• Fri:

iKAGRA ETM suspension

• Current status (Ohishi): Working well.

Travel Plans

• Travel (Week of 3/28)
  • Takahashi:
  • Shoda: 3/26-30
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:
• Travel (Week of 4/4)
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Ohishi:

Electronics

• What are necessary in the next few weeks ?
  • Nothing
• Watch dog system (Tanaka)

  • JGW-E1604990

• Guardian script for PR3 (Shoda, Okutomi, Fujii)
  • Mark adapted sustools.py library from LIGO into vistools.py, wrote scripts to automate making safe.snap files.
• Electronics diagram and review

  • #Electronics document tree for VIS by Mark (http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4937)

  • #Updated PR3 schematic with OpLev wiring (http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4795)

  • #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)
• OSEM assembly (Akutsu)
  • Schedule for each suspension is necessary

  • Each leader must tell Akutsu-kun when and how many OSEMs they need by the next meeting.

Type-B

• KAGRA/Subgroups/VIS/TypeB

• Task list/schedule

• Quick summary, week to 3/18
  • Hirata-san made production drawings of ballast masses for checking.
  • Hirata-san updated TM and RM assembly drawings.
  • Hirata-san worked on IM, IMR and full payload assembly drawings - still on going and checking. Fix as soon as possible to order the screws. We need review.

  • Hirata-san and Takahashi-san began building setup to measure SF optimum loads.-->Ask ATC people.

  • Fabian was at Kamioka helping with iKAGRA.
  • Mark was at Kamioka helping with iKAGRA, and worked on Python stuff to support Guardian etc.
  • Mark took more photos of the BS clean booth and worked on assembly procedure.
  • Prism meeting postponed to 3/29.
• BS prism preparation (Mark)
  • We decided to order 6 to Shinko-sha

    • Meeting with company was set for 3/24 in Yokohama, but postponed to 3/29.

    • Aso will check with Ohashi-san about the budget -> we can place an order now.

    • We will use the sapphire prisms for the test hanging too
    • Since we need to go forward on the BS and we can't make a decision on SR, we decided to go with tall 6.28 mm prisms, which saves adjusting other parts.
• Can we make SR wire breakers bigger ?
  • Fukushima-san preparing test: 3/4/2016 + 1 month = ≈4/1/2016
• Flag design

  • BS Flag Redesign on OneDrive

  • Optic flag design
    • Concepts 4 and 5 under consideration. Mark will arrange the meeting on this issue in the next week.
  • IM Flag design
    • Need to do drawings for self-assembling and rigid designs
  • Widen the OSEM opening (Akutsu)
  • A new local length sensing

    • Slides by Ettore for OpLev length sensing: JQW-T1503946

    • The noise of the OpLev length sensor will be worse than OSEMs

    • Reflection type shadow sensor (Akutsu)
  • Discussed a possibility to remove the sensing function from the mirror OSEM.
    • Chop off the flag part from the magnet holder
      • Safer (less possibility of flag damage)
      • Wider range

    • OpLev with two QPD sensors may be used instead to sense the longitudinal motion (Virgo is doing this)

    • Question is whether the sensing noise is good enough or not

    • Akutsu will consider if this option is possible in KAGRA OpLev

• BS dummy optics design (Fabian)

  • T1604811

  • Hirata-san received one quote, is waiting on a second.
• BS secondary prisms (no action)
• EQ stop screws, extensions and lock nuts - designed, drawn; will order in new financial year (April)
• Ballast masses for payload

  • Hirata-san created drawings DropBox link

• Lower breadboard stuff
  • Breadboard spring bases and associated cable clamps: in manufacture
  • Breadboard springs: in manufacture
  • Damper ring needs to have central hole enlarged to allow passage of suspension during installation.
    • Received quote from Mirapro. Rings were removed from KAGRA.
  • Nail-head parts too short
    • Quote from Mirapro received.
• Extension springs for IM pico motors: need to do new drawing from Promec, have made
• BS Assembly Frame Design (Mark, Hirata)
  • Design is almost complete
  • Need to add some mechanism to hook a load gauge

    • Mass budget (E1604966).

  • Need to add some attachment points (e.g., ferromagnetic plates) for placing wind-shield panels.
  • Need to check the structural strength, did mass budget (see above)
  • Mirapro postponed setting a meeting date till after 3/25.
• 2D and 3D CAD
  • Assembly drawings
    • Hirata-san worked on IM assembly drawing for BS - nearly finished.
    • IRM on-going.
  • BS 3D Assembly
    • Needs updates for BF and SF blade spring configuration.
• Procedure documents

  • BS team need to visit the site in the first week of April for checking the installation procedure.

  • Mark worked on main assembly.
  • Fabian worked on payload assembly.
• #BS gluing jigs (Tatsumi)
• #Not enough crane height problem (Hirata, Saito)
• #BS clean bag (Aso)

Type A

• Task list (Takahashi)

• Thinking about a possibility of testing the long filter chain using the prototype EQ stop in Kashiwa.
  • The prototype EQ stop will be transported from Kashiwa to Kamioka on 31th March.
  • Pre-assembly of the EQ stop prototypr on 6-7 April.
  • Demonstration of installation procedure using prototype filters (SFx1 + BFx2) from May.
• The kick-off meeting will be held on 31th March.

• 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).
• Please notice humidity keeping maraging steel to avoid cracking noise.
• Simultion: Okutomi will work with Fujii
  • Will have a draft simulation results by the Type-A kick-off meeting.
    • Got simulation information from Fujii-kun and Cryo group.
    • Now able to run simulation code
    • Need to confirm parameters with the actually delivered ones (like the weight): Some parameters are not consistent between some data.
• #Type-A Filters Optimal Load Measurements

  • #Takahashi will make a plan for the optimal load check and ask ATC.-> Check two filters per month from April 2016. -> Will be presented to the ATC steering committee.

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 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

• #PR2 Wire breaker problem
  • Prism removal from PR2 (Hirose, Mark)
    • Spare mirror is now back to Kashiwa
• #CLIO suspension
  • Ishizaki-san will come to pick it up
• Modification for bKAGRA

  • wiki

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

  • Will have a brainstorming after the JSPS meeting -> Done (3/23)
    

    • We also discussed with Uraguchi-san, and tell him our concerns raised in our brainstorming discussion. (3/25)
      

  • Action items for Type-Bp modification
    • Calculate the upper limit of the resonant fequency for IP (Fujii)
    • Check if we need the magnetic damper for the bottom filter (Fujii)

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

    • 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)
  • Review in April

Other

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

Next meeting

2016/4/1 (Fri) 13:30 -

Next F2F 2016/4/8