A high-temperature superconducting coil shielding current elimination device

Abstract

A high-temperature superconducting coil shielding current elimination device is composed of a skeleton, a cold head, a high-temperature superconducting strip, a stainless steel strip, a terminal, an AC power supply and a DC power supply. High-temperature superconducting strips and stainless steel strips are not wrapped with insulating materials on the surface, but are wound side by side on the skeleton. There are grooves on the inner side of the frame to install terminal posts, and round holes are opened on the outside of the frame to install terminal posts and cold heads respectively. The inner side of the high-temperature superconducting strip and the stainless steel strip share a terminal, and the outside is connected to an independent terminal. The high-temperature superconducting strip is connected to a DC power supply to generate a static magnetic field in the central area of ​​the coil. The stainless steel strip is connected to an AC power supply to provide high-temperature superconducting The current flowing between the layers of the strip and the stainless steel strip causes heating of the interlayer resistance, thereby reducing the critical current in the high-temperature superconducting coil and further eliminating the influence of the shielding current.

Description

technical field [0001] The invention relates to a shielding current eliminating device, in particular to a high temperature superconducting coil shielding current eliminating device. Background technique [0002] In recent years, superconducting magnets have been widely used in many fields such as national economy and scientific research. Compared with traditional low-temperature superconducting wires, high-temperature superconducting tapes, such as commercial Bi-2223 and REBCO tapes, have higher critical temperature, critical magnetic field and mechanical strength, and have been highly valued by researchers since their birth. The working characteristics are continuously improved. Due to its excellent current-carrying performance and higher operating temperature range, high-temperature superconducting magnets play an irreplaceable role in many fields, such as space strong magnetic field applications, extremely high-field superconducting magnetic resonance spectrometers, con...

AI Technical Summary

Problems solved by technology

The generation of shielding current leads to uneven distribution of conduction current inside the high-temperature superconducting strip, which seriously affects the distribution of the magnetic field in the homogeneous region of the high-temperature superconducting magnet, and deteriorates the uniformity of the magnetic field

Due to the influence of flux creep, the shielding current will change slowly over time, resulting in the phenomenon of magnetic field drift, which directly affects the stability of the magnetic field of high-temperature superconducting magnets. MRI equipment application presents challenges

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