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Nuclear magnetic resonance superconducting magnetic quenching protection device

A superconducting magnet, quench protection technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., can solve the problems of large induced current, difficult to control, temperature rise and so on

Active Publication Date: 2012-10-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, the timing of each group of coils being triggered to quench is random and difficult to control
For high-field NMR superconducting magnets, the electromagnetic coupling between coils is very strong, and the energy storage density is very high. This uncontrolled quench acceleration process will still cause a certain coil induction current to be too large, or the temperature rise to be too high. high

Method used

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  • Nuclear magnetic resonance superconducting magnetic quenching protection device

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] The superconducting magnet 1 applicable to the present invention is composed of multiple sets of main coils L1a-L1d and a set of compensation coils L2 connected in series, and all the main coils L1a-L1d of the superconducting magnet 1 and a set of compensation coils L2 are coaxially arranged radially and There is no thermal contact. A main superconducting switch 5 is connected in parallel at both ends of the superconducting magnet 1 to realize the permanent mode operation of the superconducting magnet 1 .

[0016] The quench protection device of the present invention is composed of multiple main coil shunt circuits 3 and one compensation coil shunt circuit 4 . The number of main coil shunt circuits 3 is the same as the number of sets of main coils L1a-L1d in the superconducting magnet 1, and each set of main coils L1a-L1d is connected i...

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Abstract

A nuclear magnetic resonance superconducting magnetic quenching protection device consists of a plurality of main coil divided circuits (3) and a compensation coil divided circuit (4). Each main coil divided circuit (3) is formed by serially joining a diode pair (2) with a compensation coil heater (R2). The compensation coil divided circuit (4) is formed by serially joining a diode pair (2) and a heater assembly (6) which is formed by serially joining all main coil heaters (R1a to R1d). Two ends of each main coil (L1a to L1d) are respectively connected with one main coil divided circuit (3) in parallel. Two ends of a compensation coil (L2) of a superconducting magnetic body (1) are connected with one compensation coil divided circuit (4) in parallel.

Description

technical field [0001] The invention relates to a protection device against superconducting magnet quenching, in particular to a protection device for superconducting magnets in a high magnetic field nuclear magnetic resonance imaging system not to be damaged during quenching. Background technique [0002] Superconductors used in superconducting magnets can only exhibit superconducting properties when certain conditions (such as temperature, magnetic field, current density) are met. Once the conditions are destroyed, superconductors will undergo quenching. A small part of the superconductor ceases to be superconducting and enters a resistive state. Any current flowing through this resistive part will cause local Joule heating. This will cause quenching in adjacent parts of the superconductor, resulting in a larger resistive volume, which in turn leads to further Joule heating. [0003] The quenching process of a superconducting magnet is the conversion process of electrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H5/00
Inventor 陈顺中李毅戴银明王厚生王秋良
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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