A detachable cryostat includes many novel structures. Two radiation shields are installed in the detachable cryostat. One of the radiation shields is cooled by the second-stage cold chamber utilized to contain a cryogen, and the other one is cooled by the first-stage cold head of the cryocooler. These structures are both used for reducing heat loads from an outside. The resilient supporting device, the resilient circular sleeve, the bellows and the conductive blocks are utilized to achieve excellent thermal contact and complete thermal isolation between the cryocooler and the cryogen. A detachable binary current lead device can be introduced in the detachable cryostat, wherein, the detachable binary current lead includes a superconducting current lead and a copper current lead. When the installation adjustment mechanism is tightly pressed and loosened, it can enable the superconducting current lead to contact and separate from the copper current lead.

The present invention discloses an inter-layer transition forming machine for winding of a large-sized superconducting coil. A vertically movable forming mechanism and a horizontally movable forming mechanism are mounted on a fixing plate. When the winding of a large-sized superconducting coil performs inter-layer transition, an armored superconducting conductor is clamped by wedge clamping mechanisms with right- and left-handed threads on the vertically movable forming mechanism and the horizontally movable forming mechanism, and a reference line on the conductor is ensured to be aligned with a reference line on a forming mold. The vertically movable forming mechanism is pressed down, under the drive of a double-acting hydraulic cylinder, in a vertical direction to form inter-layer transition, and the horizontally movable forming mechanism moves in a horizontal direction according to the reduction of the vertically movable forming mechanism.

A solenoidal magnet section has a high-temperature-superconductor tape wound in a solenoidal manner in a main winding chamber of a coil former. Two joints, each from the HTS tape to a follow-on superconductor, are integrated in the magnet section. The terminal sections of the HTS tape and the associated follow-on superconductor are each wound onto the coil former and connected to one another in a laminar manner. The regions of the first and second joint are axially offset from each other and the main winding chamber. The magnet section occupies a radial range with limits less than 20% larger than the outer radius of the main HTS winding package and less than 20% smaller than the inner radius of the coil former in the region of the main winding chamber. A plurality of magnet sections can be inserted one inside the other to form a magnet coil assembly.

A superconducting joint arrangement for superconducting magnets, having an elongate joint arranged between superconducting filaments of superconducting wires of one or more superconducting coils, and excess wire provided between the elongate joint and the one or more superconducting coils.

To provide a superconducting magnet apparatus with a structure which can prevent an increase in apparatus size even when a number of connection portions serving to connect superconducting wires is great. The superconducting magnet apparatus includes a first wiring-holding portion (tubular body (12)) extending from a bobbin (6) in an axial direction of a superconducting coil (1) and a second wiring-holding portion (joint plate (13)) which is provided on a same side in the axial direction as the tubular body (12), extends in a direction intersecting with the axial direction, and has a greater diameter than that of the bobbin (6) and the tubular body (12). Superconducting wires (7a to 11a) which extend from the superconducting coil (1) and connect to one another are spirally wound on the tubular body (12) and fastened to a groove (13a) formed on the joint plate (13).

A magnet assembly (1) with a cryostat (2) has a superconducting magnet coil system (3), an active cooling device (4) for the coil system, and current leads (5a, 5b) for charging the coil system. The current leads have at least one normal-conducting region (15a, 15b), wherein multiple cold reservoirs (20) are thermally coupled to the current leads along the normal-conducting region thereof, in order to absorb heat the normal-conducting region during charging of the magnet coil system. The current leads have a variable cross-sectional area B in the normal-conducting region along the extension direction thereof, wherein at least over a predominant fraction of their overall length in the normal-conducting region, the cross-sectional area B decreases from a cold end (18a, 18b) toward a warm end (19a, 19b). This provides a magnet assembly requiring reduced cooling power during charging, with less heat introduced into the magnet coil system in normal operation.

There is set forth herein a superconducting lead assembly comprising: a positive superconducting wire; a negative superconducting wire, wherein the positive superconducting wire is configured to conduct inflow current to a cryogenic apparatus and wherein the negative superconducting wire is configured to conduct outflow current away from the cryogenic apparatus; and an electrically insulating separator, wherein the positive superconducting wire and the negative superconducting wire are arranged proximately one another and on opposite sides of the electrically insulating separator for cancellation of electromagnetic forces attributable to current flowing simultaneously in opposite directions within the positive superconducting wire and the negative superconducting wire, and wherein a length of the superconducting lead assembly is flexible. In one embodiment the positive superconducting wire and the negative superconducting wire can include high temperature superconducting (HTS) material.

There is described a magnet assembly comprising a superconducting coil, a cryogenic system, a DC voltage source, an SMPS, current leads, and a controller. The cryogenic system comprises a cryostat and is configured to maintain the superconducting coil at an operating temperature below the critical temperature of the superconductor. The DC voltage is source located outside the cryostat. The SMPS is located inside the cryostat and configured to supply power from the DC voltage source to the superconducting coil. The SMPS comprises a voltage step-down transformer having a primary and a secondary winding. The current leads connect the DC voltage source to the SMPS. The controller is configured to cause the SMPS to supply a first amount of power to the magnet in order to ramp up the magnet to operating current, and a second amount of power to the magnet during steady state operation of the magnet, wherein the first amount of power is greater than the second amount of power.

The present disclosure relates to a magnetic resonance (MR) scanner and magnetic resonance imaging (MRI) system. The MR scanner includes a superconducting magnet, a superconducting quantum processor, a first cooling system surrounding the superconducting magnet, and a second cooling system surrounding the superconducting quantum processor. The second cooling system is embedded in the first cooling system.

A superconducting magnet for producing part of a substantially toroidal field in a device is described. The magnet comprises: a set of conductors comprising one or more first conductors (31f) and one or more second conductors (32f), and a set of joints (33). Each of the joints (33) connects a region of a first conductor (31f) with a region of a second conductor (32f) to form a series of alternating first and second conductors corresponding to at least part of a winding of the magnet. Each of the joints (33) is positioned away from a midplane of the toroidal field. The joints (33) are positioned on alternating sides of the midplane. Each first conductor (3 If) passes through the midplane at a smaller distance from an axis of rotation of the toroidal field than does each second conductor (32f). Each of the regions is elongate and extends in a direction at least partly away from the midplane.