Abstract: A current lead arrangement for supplying current to a superconducting magnet coil, comprising a current lead and a cryogenic refrigerator. The current lead comprises a first section of low temperature superconductor (LTS) wire, joined to a second section of a high temperature superconductor (HTS) material, in turn joined to a third section of a resistive material. The cryogenic refrigerator comprises a first cooling stage and a second cooling stage. A lower end of the third section and an upper end of the second section are thermally linked to the first cooling stage, a lower end of the first section is thermally and electrically connected to the superconducting magnet coil.

Abstract: The disclosure relates to a magnetic resonance imaging device comprising a main magnet, a gradient system including at least one gradient coil, a thermal bus structure, a shield structure arranged between the gradient system and the main magnet and a cryocooler including a cold head, wherein the shield structure is configured to reduce a transport of heat energy to the main magnet and wherein the main magnet comprises a magnet spacer configured for spacing individual coils of the main magnet, wherein the thermal bus structure comprises at least one thermal bus element extending through the magnet spacer for providing a thermal connection between the cold head of the cryocooler and the shield structure.

Abstract: A superconducting magnet arrangement including: an outer vacuum container (OVC) housing magnet coils; a cryogen vessel thermally linked to the magnet coils; a cold head sock accommodating a cold head, with a thermal contact provided between the cold head and the magnet coils; tubes linking the interior of the cryogen vessel with the interior of the cold head sock; and a thermosiphon circuit defined by the cryogen vessel, the tubes, and the cold head sock. Pre-cooling and removal of ice build-up may be performed using the thermosiphon circuit.

Abstract: A self-supporting flexible shield for location between a warm surface and a cold mass so as to substantially enclose the cold mass, wherein the self-supporting flexible shield comprises a shaped plastic sheet with a low emissivity coating on both of its sides.

Abstract: A superconducting magnet device including a plurality of superconducting magnet coils; a structural element mechanically and thermally linked to respective magnet coils to retain them in respective relative positions; and a cooling station thermally connected to a cryogenic refrigerator and to the structural element. A thermally conductive path, which passes through the structural element, is established between the cryogenic refrigerator and the superconducting magnet coils through the structural element.

Abstract: A current lead for supplying current to a superconducting device, the current lead having a high temperature superconductor (HTS) conductor extending along a length of the current lead, the HTS conductor thermally and electrically joined to an electrical shunt. Voltage taps are connected to respective ends of the HTS conductor for connection to a quench heater in thermal contact with a superconducting device. A quench in the HTS conductor gives rise to a voltage appearing between the voltage taps, and the voltage is applied to the quench heater to give rise to quench within the superconducting device.

Abstract: A superconducting magnet arrangement including: an outer vacuum container (OVC) housing magnet coils; a cryogen vessel thermally linked to the magnet coils; a cold head sock accommodating a cold head, with a thermal contact provided between the cold head and the magnet coils; tubes linking the interior of the cryogen vessel with the interior of the cold head sock; and a thermosiphon circuit defined by the cryogen vessel, the tubes, and the cold head sock. Pre-cooling and removal of ice build-up may be performed using the thermosiphon circuit.

Abstract: A self-supporting flexible shield for location between a warm surface and a cold mass so as to substantially enclose the cold mass, wherein the self-supporting flexible shield comprises a shaped plastic sheet with a low emissivity coating on both of its sides.

Abstract: A current lead for supplying current to a superconducting device, the current lead having a high temperature superconductor (HTS) conductor extending along a length of the current lead, the HTS conductor thermally and electrically joined to an electrical shunt. Voltage taps are connected to respective ends of the HTS conductor for connection to a quench heater in thermal contact with a superconducting device. A quench in the HTS conductor gives rise to a voltage appearing between the voltage taps, and the voltage is applied to the quench heater to give rise to quench within the superconducting device.

Abstract: A superconducting magnet device including a plurality of superconducting magnet coils; a structural element mechanically and thermally linked to respective magnet coils to retain them in respective relative positions; and a cooling station thermally connected to a cryogenic refrigerator and to the structural element. A thermally conductive path, which passes through the structural element, is established between the cryogenic refrigerator and the superconducting magnet coils through the structural element.

Abstract: A fault-tolerant cryogenically cooled system including an outer vacuum chamber defining a vacuum region in its interior volume; a cryogenic refrigerator; equipment to be cooled, housed within the vacuum region; a free volume delimited within the vacuum region and containing a cryogen; a cold plate exposed to the free volume and thermally linked to the equipment to be cooled; a heat exchanger thermally linked to a coldest stage of the refrigerator and exposed to the free volume; a cryogen buffer vessel delimiting a buffer volume; and a passage linking the buffer volume with the free volume.