Abstract: A pulsed magnetic field is generated by a device having a magnet to be operated in pulse operation which contains at least one superconductive refrigerant-free winding that is disk-shaped or saddle-shaped. Also included is a refrigerating unit which has at least one cold head. A line system, having a refrigerant circulating in it according to a thermosiphon effect, thermally couples the winding to the cold head. The line system has a plurality of separate pipes lying next to one another. The pipes, open onto a common refrigerant distributor and closed at the other end, are thermally coupled to the surface of the disk-shaped or saddle-shaped winding.

Abstract: The present provides a cryogenic thermal battery arrangement for maintaining a superconducting magnet coil or similar apparatus at cryogenic temperature for a required shipping period, such as thirty days, without consuming a significant amount of costly cryogen. According to another aspect, the invention allows extended shipping periods without incurring excessive costs.

Abstract: An electromagnet comprising a plurality of coils of superconductive material, monolithically embedded in an embedding material, which is solid at the temperature of operation of the superconductive electromagnet, and a method for producing an electromagnet comprising a plurality of coils of superconductive material, comprising the steps of winding coils of superconductive material, retaining the coils at predetermined relative positions, and monolithically embedding the plurality of superconducting coils in an embedding material, which is solid at the temperature of operation of the superconductive electromagnet.

Abstract: A cryogen tank in thermal and mechanical attachment with the equipment to be cooled. Direct thermal conduction between the cryogen and the equipment provides the required cooling. The tank is preferably arranged so as to lie within an existing profile of the cooled equipment, and to be relatively small as compared to known cryogen tanks.

Abstract: The present invention provides a recondensing service neck for a cryostat. A service neck tube (22) provides access to the interior (10) of the cryostat. A recondensing surface is provided (44) for recondensing liquid cryogen boiled off from a liquid cryogen (12) within a cryostat; and a recondensing refrigerator (30) is provided for cooling the recondensing surface to below the boiling point of the cryogen.

Abstract: The present invention provides an improved joint between a thermal link and a tubular electrical conductor within a turret used in a cryostat. The joint is thermally conductive yet electrically isolating, cheap and simple to produce, and offers superior electrical isolation.

Abstract: A superconducting magnet system comprising a superconducting magnet, itself comprising a plurality of magnet coils, arranged to protect quench heaters yet provide effective quench protection.

Abstract: A trailer for housing a mobile MRI system has magnetic shielding in the form of a plurality of sheets of magnetic material which are supported within the trailer, by a rigid supporting structure or frame. The layers are arranged in a stacked or laminar configuration with the laterally longest layer disposed inward of the remaining layers, such that the width of the gap between that layer and the exterior walls of the trailer at the lateral extremities of the shielding is greater than its width in a central area. The rigid frame maintains the gap and prevents contacting of the shielding and the trailer walls.

Abstract: A quench line and exit plenum configuration for a mobile MRI system housed in a transportable trailer includes an exit plenum with deflector plates that direct the quench flow of cold gases upward and away from surrounding objects. In addition, the plenum also includes dual vents to facilitate optimum gas flow and water drainage. The deflector plates are configured to utilize the Venturi effect to create an auxiliary flow of the ambient air to help deflect the flow of cold gases away from nearby pedestrians, when the magnet is quenching, and to enable service personnel to fill the magnet safely while in the vicinity of the exit plenum.

Abstract: A quench protection circuit (30) for a superconducting magnet (10), comprising at least one heater (R1) for association with a corresponding coil (L1) of the superconducting magnet. The at least one heater is arranged to be driven by an inductor (36) which is connected in series with the at least one heater and is arranged to derive a voltage from variation in a magnetic field of the superconducting magnet. The at least one heater and the inductor are arranged in a series circuit which further comprises a non-linear positive temperature coefficient resistor (34).