Excitation detecting circuit of superconducting magnet and control method thereof

Abstract

The invention discloses an excitation detecting circuit of a superconducting magnet and a control method thereof. The superconducting magnet in the excitation detecting circuit of the superconductingmagnet includes two first superconducting components and a plurality of second superconducting components. The first superconducting components and the second superconducting components include superconducting coils, and the excitation detecting circuit of the superconducting magnet includes a second switch module and at least one first switch module. The superconducting coils form a series branch, and two ends of the series branch are connected to an excitation power supply. The first switch module is used to make the excitation power supply provide an excitation current to the correspondingfirst superconducting component in a pre-excitation stage of an excitation circuit, and the second switch module is used to control an open circuit of the series branch in the pre-excitation stage ofthe excitation circuit. In the technical scheme, losses of liquid helium are reduced, and a probability of superconducting coil quench in the excitation circuit due to movement of the superconductingcoils in the first superconducting components during subsequent formal excitation detection of the excitation circuit is decreased.

Description

technical field [0001] Embodiments of the present invention relate to the field of superconducting technology, and in particular to an excitation detection circuit of a superconducting magnet and a control method for the excitation detection circuit of a superconducting magnet. Background technique [0002] At present, the magnetic field in a Magnetic Resonance Imaging (MRI) system is provided by a superconducting magnet, which is composed of a number of superconducting coils in series, and needs to work in a low-temperature liquid environment, such as liquid helium. [0003] During the excitation process of the superconducting coil, due to various disturbances, a quench phenomenon will occur, that is, the superconducting coil is converted from a superconducting state to a normal state, so that the electromagnetic energy in the superconducting coil is converted into heat energy, and a large amount of expensive liquid helium is evaporated, resulting in waste of energy. Cont...

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Problems solved by technology

[0003] During the excitation process of the superconducting coil, due to various disturbances, a quench phenomenon will occur, that is, the superconducting coil is converted from a superconducting state to a normal state, so that the electromagnetic energy in the superconducting coil is converted into heat energy, and a large amount of expensive liquid helium is evaporated, resulting in waste of energy

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