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First-stage pullable binary coaxial current lead structure

A current lead and coaxial technology, applied in the direction of circuits, electrical components, superconducting magnets/coils, etc., can solve problems affecting the performance of superconducting magnets, increasing consumption of liquid helium, superconducting magnet quenching, etc., to avoid heat generation If the temperature is too large, the upper working temperature will be reduced, and the thermal resistance of the thermal bridge will be small.

Inactive Publication Date: 2012-02-22
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

Therefore, the detachable lead of this structure has the problem of excessive heat leakage, which increases the consumption of liquid helium during the excitation process
Especially for closed-loop superconducting magnets with conduction cooling or less liquid helium structure, since there is not enough cooling medium for heat exchange with the joints, the Joule heat of the removable joints is likely to be transmitted to the inside of the magnet, thereby causing the quenching of the superconducting magnet , will seriously affect the performance of superconducting magnets

Method used

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  • First-stage pullable binary coaxial current lead structure
  • First-stage pullable binary coaxial current lead structure
  • First-stage pullable binary coaxial current lead structure

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Embodiment Construction

[0052] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are for illustration only, and are not intended to limit the present invention.

[0053] figure 1 It is a schematic diagram of a one-stage detachable binary coaxial current lead structure of the present invention. The current lead structure is a one-stage pull-out binary coaxial current lead structure, which is simple and compact in structure and reliable in performance, and specifically includes: a primary current lead 10 connected to a high-temperature part; A detachable heat exchanger 20 between the primary current lead and the secondary current lead.

[0054] Wherein the first-level positive lead 102 and the first-level negative lead 104 in the first-level current lead 10 are connected to the high-temperature part, and the copper current lead with the optimal length and cross-sectional size is used to achieve the minimum heat leak...

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Abstract

The invention discloses a first-stage pullable binary coaxial current lead structure, and relates to a binary current lead technology. The structure comprises a first-stage current lead connected with a high-temperature part, a second-stage current lead connected with a low-temperature part and a pullable heat exchanger which is connected with the first-stage current lead and the second-stage current lead respectively and is positioned between the first-stage current lead and the second-stage current lead. The first-stage pullable binary coaxial current lead structure has the advantages of compact structure, stable performance, reliable operation, low heat leakage and convenience in disassembly and assembly, has the capacity of reducing heat leakage in an entire excitation process and subsequent normal operation, and is particularly suitable for a superconducting magnet with conduction cooling, less liquid helium and high magnetic field strength and operating in a closed loop.

Description

technical field [0001] The invention relates to the technical field of binary current leads, in particular to a one-stage removable binary coaxial current lead structure. The invention belongs to nuclear magnetic resonance imaging (MRI) superconducting magnets, high-energy physical superconducting magnets and other superconducting magnets that require closed-loop mode operation, and is especially suitable for closed-loop superconducting magnets with conduction cooling, less liquid helium, and high magnetic field strength structures. A current lead device. Background technique [0002] At present, for superconducting magnets with strict requirements on magnetic field stability, such as clinical medical imaging, MRI superconducting magnets are required to have a magnetic field stability of at least 0.1ppm / h. Since the conventional power supply has a certain degree of ripple, therefore, They generally work in a closed-loop mode of operation. That is, after the excitation of t...

Claims

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Application Information

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IPC IPC(8): H01F6/06H01F6/00H01F6/04H01R13/15
Inventor 马文彬朱自安赵玲张国庆
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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