Superconducting magnet excitation detection circuit and its control method

Abstract

The invention discloses an excitation detection circuit of a superconducting magnet and a control method thereof. The superconducting magnet in the excitation detection circuit of the superconducting magnet includes two first superconducting parts and a plurality of second superconducting parts, the first superconducting parts and the second superconducting parts both include superconducting coils, and the superconducting The excitation detection circuit of the magnet includes a second switch module and at least one first switch module, the superconducting coil forms a series branch, and the two ends of the series branch are connected to the excitation power supply, and the first switch module is used in the pre-excitation stage of the excitation circuit The excitation power supply is controlled to supply excitation current to the corresponding first superconducting component, and the second switch module is used to control the disconnection of the series branch in the pre-excitation stage of the excitation circuit. Through the technical solution of the present invention, the loss of liquid helium is reduced, and the The probability of quenching of the superconducting coil in the excitation circuit caused by the movement of the superconducting coil in the first superconducting component during the subsequent formal excitation test of the excitation circuit is calculated.

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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