Special purpose device for measuring superconducting line joint resistance

Abstract

The present invention discloses a specialized device for measuring the resistance of a superconducting line joint, comprising a low temperature Dewar unit, a room temperature tube unit, a background magnet unit, an excitation magnet unit, a linkage frame unit, a weakening magnetic field measuring unit, etc. The specialized device has the advantages that only the room temperature tube is required to be moved out from the low temperature Dewar via a guide rail when a sample loop of the measured superconducting line joint is replaced, so that the volatilization amount of the liquid helium in an experimental process is reduced. The background magnet is positioned on the lateral side of a Hall element which measures the weakening magnetic field of the sample loop of the superconducting line joint. Compared with being positioned at the lower side of the Hall element, the background magnet positioned at the lateral side of the Hall element reduces the influence of the background magnet to the fact that the Hall element measures the weakening magnetic field generated by the sample loop of the superconducting joint. With the room temperature tube technical, the Hall element is arranged inside the room temperature tube, namely a normal temperature Hall sensor measures the weakening magnetic field of the sample loop of the superconducting joint. The cost of the device is reduced and the reliability of the measurement is improved.

Description

technical field [0001] The invention belongs to the technical field of superconductivity, and relates to a special device for measuring the joint resistance of superconducting wires. Background technique [0002] The resistance of the superconducting wire in the superconducting state is close to zero, and it can flow a larger current than the normal temperature conductor, and its application is becoming more and more extensive. However, in the manufacturing process of large and medium-sized superconducting coils, a large amount of superconducting wire is used. Due to the requirements and restrictions of the length of the superconducting wire supplied by the manufacturer or the winding process of the superconducting coil, it is difficult to complete the winding of the coil with a complete superconducting wire. . Therefore, there are some forms of superconducting joints in the structure of large and medium-sized superconducting coils. At this time, the current carrying capaci...

AI Technical Summary

Problems solved by technology

In addition, a background magnetic field of a certain strength is required in the process of measuring the resistance of superconducting joints. If the background magnet is placed in an inappropriate position or the shielding effect is not good, it will affect the attenuated magnetic field generated by the superconducting joint sample, thereby affecting the measurement accuracy.

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