Reinforcement of a superconducting magnet coil

A superconducting magnet assembly comprising a cylindrical magnet coil assembly with an axis of cylindrical symmetry (z) and with a reinforced coil region,

• wherein the reinforced coil region comprises:
• a layered conductor coil assembly comprising a conductor tape or a conductor wire, forming at least four cylindrical conductor layers, each having a plurality of circular conductor turns centered around and aligned along the axis of cylindrical symmetry (z),
• the conductor tape or conductor wire comprising at least one superconducting element, forming a continuous path along the circular conductor turns of at least one of the cylindrical conductor layers and configured to carry an electrical current Icond,
• the conductor tape or conductor wire having an elastic modulus Econd in a circumferential direction of the circular conductor turns,
• a layered corset coil assembly comprising a corset tape or a corset wire, forming at least one cylindrical corset layer, having a plurality of circular corset turns centered around and aligned along the axis of cylindrical symmetry (z),
• the corset tape or the corset wire having an elastic modulus Ecors in the circumferential direction of the circular corset turns, with:
• Ecors>1.5*Econd,
• the layered corset coil assembly having an inner radius bigger than an outer radius of the layered conductor coil assembly,
• a corset sheet assembly comprising a corset foil element forming at least one corset sheet, a cross section of the at least one corset sheet with any plane (A) perpendicular to the axis of cylindrical symmetry (z) forming a segmented circle having a radius and centered around the axis of cylindrical symmetry (z),
• the radius of the segmented circle of the at least one corset sheet being bigger than a radius of a first of the cylindrical conductor layers and smaller than a radius of a second of the cylindrical conductor layers,
• wherein the segmented circle formed by the cross section of the at least one corset sheet with the plane (A) perpendicular to the axis of cylindrical symmetry (z) covers at least 90% of a full circle and has no more than four segments;
• wherein the corset foil element has an in-plane elastic modulus Efoil, with
• Efoil>1.5*Econd;
• and wherein the layered conductor coil assembly has at least one of the cylindrical conductor layers with at least one of the circular conductor turns with:
• Icond>0.005*Econd*Acond/(Bz*r),
• where
• Icond is the electrical current in the circular conductor turn,
• Acond is the cross-sectional area of the conductor tape or conductor wire of the circular conductor turn,
• Bz is the component of the magnetic field along the axis of cylindrical symmetry (z) in the circular conductor turn, and
• r is the radius of the circular conductor turn.