A high-current-carrying high-temperature superconducting composite conductor based on split-lobe stacking structure

Abstract

The invention discloses a high-current-carrying high-temperature superconducting composite conductor based on a split stack structure. The composite conductor consists of a stainless steel armor with an outer square and an inner circle, and four high-temperature superconducting cables of the same type. The structures of the four high-temperature superconducting cables are, from outside to inside: an insulating sheath, an aluminum sheath, a quarter-circular copper substrate with a square groove on the outside of the four petals, and a copper substrate embedded respectively. Four groups of yttrium-barium-copper-oxygen high-temperature superconducting tapes are stacked in a square groove. The copper substrate, the stack of yttrium-barium-copper-oxygen high-temperature superconducting strips and the aluminum sheath are fixed by soldering; equidistant cooling holes are opened on the aluminum sheath to enhance the cooling capacity of the conductor. The invention has compact structure, high current-carrying capacity under high background magnetic field conditions, strong anti-interference ability and high stability margin, and is suitable for various high-field superconductors including magnetic confinement fusion reactor superconducting magnets Cable application scenarios.

Description

technical field [0001] The invention belongs to the field of superconducting engineering, and in particular relates to a structure design of a high-current-carrying high-temperature superconducting composite conductor based on a split-lobe stacking structure and a key process for manufacturing it. Background technique [0002] The superconducting magnet system is one of the most important subsystems in the magnetic confinement fusion device. The magnet system confines the high-parameter plasma by generating a strong magnetic field with a specific configuration, so that it can perform fusion reactions safely and stably. A magnet system with good critical properties under high background field is essential to obtain a stable plasma discharge with high parameters. At present, the tokamak device has basically abandoned conventional conductor magnets, and all magnet systems are made of superconducting materials. With the improvement of the magnetic field strength and other param...

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Problems solved by technology

The current-carrying capacity of a single second-generation high-temperature superconducting tape is small, which is not enough to meet the high-current-carrying application scenarios represented by fusion reactor magnets; because the second-generation high-temperature superconducting material is a metal oxide ceramic material, it is relatively brittle , poor machining performance, cannot be directly used in applications such as superconducting coil winding

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