Bruker Switzerland Ag

Stephan Heiss

Pierre-Alain Bovier

Joerg Hinderer

Stephen Alfred March

Robert Schauwecker

Patrik Vonlanthen

Franck Borgnolutti

Matteo Alessandrini

Dmitry Eshchenko

Jörg Hinderer

A superconductor magnet system () includes a cryostat (), a superconductor bulk magnet (), and a cryogenic cooling system (). The bulk magnet () has at least N axially stacked bulk sub-magnets (-), with N&#x2265;3. Between each two axially neighboring bulk sub-magnets, an intermediate body (-) is arranged. The intermediate bodies (-) are made from a non-metallic thermal insulator material. The cryogenic cooling system () is adapted for independently controlling the temperature of each bulk sub-magnet (-), and has, for each bulk sub-magnet, a temperature sensor (-) for sensing the temperature of the respective bulk sub-magnet and an adjustment unit (-) for adjusting a heating power and/or a cooling power at the respective bulk sub-magnet.

Superconductor magnet system, with individual temperature control of axially stacked bulk sub-magnets

Charging method for a superconductor magnet system with reduced stray field, weight and space includes: arranging the system within a charger magnet bore; with T&#x3e;Tand T&#x3e;T, applying a current Ito the charger magnet and increasing Ito a first current I&#x3e;0; lowering a main superconductor bulk magnet temperature Tto an operation temperature T, with T&#x3c;T, while keeping T&#x3e;T; lowering Ito a second current I&#x3c;0, thereby inducing a persistent current IPin the main magnet; lowering a shield magnet temperature Tto an operation temperature T, with T&#x3c;T; increasing Ito zero, thereby inducing a persistent current IPin the shield magnet; removing the magnet system from the charger bore, and keeping T&#x2264;Twith T&#x3c;Tand T&#x2264;Twith T&#x3c;T; where: T: main magnet critical temperature and T: shield magnet critical temperature.

Method for charging a superconductor magnet system, with a main superconductor bulk magnet and a shield superconductor bulk magnet

A superconducting magnet assembly with a reinforced coil region () having a layered conductor coil assembly () forming cylindrical conductor layers (, . . . ), each having plural circular conductor turns () centered around and aligned along the axis of cylindrical symmetry (z). The reinforced coil region further includes a layered corset coil assembly () having an inner radius bigger than an outer radius of the layered conductor coil assembly (), and a corset sheet assembly () including a foil element forming a corset sheet (, . . . ). A cross section of the corset sheet with any plane perpendicular to the z-axis forms a segmented circle centered around the z-axis, the radius of which is bigger than that of one of the conductor layers and smaller than that of another of the conductor layers. In addition, the segmented circle covers at least 90% of a full circle but has at most four segments. The assembly provides mechanical reinforcement against radial magnetic forces.

Reinforcement of a superconducting magnet coil

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Wiesendangen, Switzerland

Stephan Heiss