An assembly of supported superconducting coils may include support structure including a flexible mounting band attached to a surface of a coil and which extends axially beyond the radially outer surface of the coil. The flexible mounting band may be attached to a support structure at multiple locations. The coil may be attached to one or more other coils by the flexible mounting band.

A method for autonomously cooling down a cryogen-free superconductive magnetic coil system includes: (a1) measuring the current temperature T.sub.actual at the magnet and comparing it to a temperature target value T1.sub.target; (a2) if T.sub.actual>T1.sub.target, actuating a vacuum pump and opening a barrier valve in a vacuum conduit that leads from the vacuum pump into a vacuum vessel containing the magnet; (b1) measuring the current pressure P.sub.actual in the vacuum vessel and comparing it to a pressure target value P1.sub.target; (b2) if P.sub.actual<P1.sub.target, activating a cold head for cooling a cooling arm; (c1) measuring T.sub.actual and comparing it to the first temperature target value T1.sub.target; (c2) if T.sub.actual<T1.sub.target, closing the barrier valve and switching off the vacuum pump; (d1) measuring T.sub.actual and comparing it to a second temperature target value T2.sub.target and maintaining the second temperature target value T2.sub.target.

A method for autonomously cooling down a cryogen-free superconductive magnetic coil system includes: (a1) measuring the current temperature T.sub.actual at the magnet and comparing it to a temperature target value T1.sub.target; (a2) if T.sub.actual>T1.sub.target, actuating a vacuum pump and opening a barrier valve in a vacuum conduit that leads from the vacuum pump into a vacuum vessel containing the magnet; (b1) measuring the current pressure P.sub.actual in the vacuum vessel and comparing it to a pressure target value P1.sub.target; (b2) if P.sub.actual<P1.sub.target, activating a cold head for cooling a cooling arm; (c1) measuring T.sub.actual and comparing it to the first temperature target value T1.sub.target; (c2) if T.sub.actual<T1.sub.target, closing the barrier valve and switching off the vacuum pump; (d1) measuring T.sub.actual and comparing it to a second temperature target value T2.sub.target and maintaining the second temperature target value T2.sub.target.

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.sub.main>T.sub.main.sup.crit and T.sub.shield>T.sub.shield.sup.crit, applying a current I.sub.charger to the charger magnet and increasing I.sub.charger to a first current I.sub.1>0; lowering a main superconductor bulk magnet temperature T.sub.main to an operation temperature T.sub.main.sup.op, with T.sub.main.sup.op<T.sub.main.sup.crit, while keeping T.sub.shield>T.sub.shield.sup.crit; lowering I.sub.charger to a second current I.sub.2<0, thereby inducing a persistent current IP.sub.main in the main magnet; lowering a shield magnet temperature T.sub.shield to an operation temperature T.sub.shield.sup.op, with T.sub.shield.sup.op<T.sub.shield.sup.crit; increasing I.sub.charger to zero, thereby inducing a persistent current IP.sub.shield in the shield magnet; removing the magnet system from the charger bore, and keeping T.sub.main≤T.sub.main.sup.op with T.sub.main.sup.op<T.sub.main.sup.crit and T.sub.shield≤T.sub.shield.sup.op with T.sub.shield.sup.op<T.sub.shield.sup.crit; where: T.sub.main.sup.crit: main magnet critical temperature and T.sub.shield.sup.crit: shield magnet critical temperature.

A superconductor magnetic field effect transistor. The superconductor magnetic field effect transistor may include a sheet of a superconducting material; and a solenoid. The sheet may be substantially flat, and the solenoid may include a plurality of turns, each of the turns being substantially parallel to the sheet. The superconducting material may be a type-II superconducting material.

A superconductor magnetic field effect transistor. The superconductor magnetic field effect transistor may include a sheet of a superconducting material; and a solenoid. The sheet may be substantially flat, and the solenoid may include a plurality of turns, each of the turns being substantially parallel to the sheet. The superconducting material may be a type-II superconducting material.

A quench protection system for a superconducting machine, such as a superconducting generator having a plurality of series-arranged superconducting coils, includes at least one switch heater electrically coupled to each of the superconducting coils. A quench protection switch is provided in series with the coils, wherein each switch heater is in thermal contact with the quench protection switch. A heater network is configured in parallel with the quench protection switch and is in thermal contact with each of the coils. A quench of any one of the coils triggers a quench of the quench protection switch, wherein the heater network then triggers a quench of all of the remaining coils.

The present disclosure relates to systems and methods for magnetic resonance imaging (MRI). The systems may include a gradient coil assembly configured to form a gradient magnetic field. The systems may also include a cryostat including a superconducting coil assembly and a magnetic field shielding apparatus arranged on/in a component of the cryostat. The superconducting coil assembly may be configured to form a main magnetic field. The magnetic field shielding apparatus may be configured to shield the superconducting coil assembly from a stray field of the gradient coil assembly. The magnetic field shielding apparatus may include a conductive shielding component, a shielding cylinder, or a combination thereof.

The present disclosure relates to systems and methods for magnetic resonance imaging (MRI). The systems may include a gradient coil assembly configured to form a gradient magnetic field. The systems may also include a cryostat including a superconducting coil assembly and a magnetic field shielding apparatus arranged on/in a component of the cryostat. The superconducting coil assembly may be configured to form a main magnetic field. The magnetic field shielding apparatus may be configured to shield the superconducting coil assembly from a stray field of the gradient coil assembly. The magnetic field shielding apparatus may include a conductive shielding component, a shielding cylinder, or a combination thereof.

A method of operating a magnetic resonance imaging (MRI) apparatus includes exciting a body coil of the MRI apparatus to emit a radio-frequency signal, determining a center frequency of a resonance curve of the body coil, and calculating a magnet target frequency based on the determined center frequency. A magnet is ramped to the magnet target frequency.