Go to the Indico Home Page Oldest event Older event Up to category Newer event Newest event Printable version
  • Compact style
  • Indico style
  • Indico style - inline minutes
  • Indico style - numbered
  • Indico style - numbered + minutes
  • Indico Weeks View
    • Switch to the management area of this event
    Login

    CCT R&D meeting #4

    → Europe/Zurich
    Hide

    Attendees: Helene Felice, Arnaud Foussat, Ariel Haziot, Glyn Kirby, Davide Tomasini

     

    Discussion over the field target

    • DT noticed that the field in the demonstrator is only 3T, with peak field at 4.2T on conductor.
      • This could be an issue as a 4T magnet was "sold".
      • It seems extremely inefficient. In order to get 4T inside, one would need up to 5T in conductor.
      • the inefficiency comes from the ratio of the aperture over the length
    • We should try to get the field to 4T inside
      • proposing an operation at 90% SS
      • reducing the aperture
      • reducing the angle and consequently the overall length of the magnet

    Actions for GK: scan the area of aperture and angle in order to get closer to 4T inside without increasing the peak field too much.

    Compute the integrated field (for 5 T peak field on the conductor) as a function of the winding angle for :

    • 90° bending angle and 236 mm diameter
    • 45° bending angle and 100 mm diameter

    Design advancements by GK

    • tapered former/coil idea to get a conical joint
    • error correction in the demonstrator design
    • leads impact improvements, idea to get the leads out of the coil plane
    • adapting the angle of the second layer to equal the length of the first layer

    R&D update by AH

    • List of technological choices
      • no Rutherford cable test
    • Small box program
      • important first is the stacking feasibility
      • do whatever resin is available (PU, stycast, ...)
    • Subscale program
      • AH still needs the designs. GK has them,
      • Action: AH should ask for them in separate discussion
    • Resistive CCT program
      • The first small dipole is ready for production, former in 3D and flanges in G10.
      • The CLIC power unit is good to start with but our need are going towards higher capacitance at lower voltage. DT believes we could adapt a capacitance rack while keeping the electronic.
      • AF wonders about the purpose of this program. It is true that it lost a lot of purpose since the combined function is not the target. Still, it is a good way to produce small field and develop processes.

    Round cable developments by AH

    • First proposals from CGP
      • external diameters ranging from 3 to 5 mm
      • inside wire are non insulated 0.85 or 0.48 mm
      • insulated copper core
      • possibilities to twist in different direction if multiple steps (longer and more expensive)
      • other design includes insulated wires in the cable
    • Table of selected configurations with the required current and length
      • Current in cable is very high (4.4 kA)
      • We should consider 2 options
        • non insulated 0.48 mm wire, 3 mm cable
        • insulated 0.85 mm wire, 4 mm cable

    Action: AH works on finding a configuration with 2.5 kA maximum. GK could start making a model with the round cables and see what it gives.

    Action: AH checks availability of of LHC strand with SCD.

    Afterwards, we could propose something more solid to SCD in order to start a proper cable development.

     

    There are minutes attached to this event. Show them.