High-temperature superconducting magnet online monitoring system

Abstract

A high-temperature superconducting magnet online monitoring system comprises a high-temperature superconducting magnet system, a conduction cooling refrigeration system, a low-temperature Dewar system, a testing device, a digital voltage meter, a carburizing ceramic temperature sensor, a measuring manganin wire, a heat conduction insulating layer, a temperature transmitter, a fiber converter, a fiber, a compression joint copper sheet and low-temperature high vacuum grease, the cooling refrigeration system comprises a refrigerating machine cold head, a copper cold conduction connecting plate and a copper cold conduction framework, the heat conduction insulating layer coats the copper cold conduction framework, the testing device comprises a computer and a current sensor, the middle of the measuring manganin wire is wound on the heat conduction insulating layer, the carburizing ceramic temperature sensor is directly pressed on the surface of a high-temperature superconducting strip, two ends of the carburizing ceramic temperature sensor are directly fixed on the surface of the high-temperature superconducting strip, gaps among the compression joint copper sheet, the carburizing ceramic temperature sensor and the high-temperature superconducting strip are filled with the low-temperature high vacuum grease for assisting in fixing the carburizing ceramic temperature sensor and conducting heat.

Description

technical field [0001] The invention relates to a monitoring system for a high-temperature superconducting magnet. Background technique [0002] In 1911, Dutch physicist Camerin Onnes discovered superconductors. Superconductors have unique physical properties such as zero resistance, complete diamagnetism and quantum tunneling effect. Since the discovery of superconductors, superconductivity and its applications have been one of the most active frontier research fields in contemporary science and technology. In energy, It has important application value in information, transportation, scientific instruments, medical technology, national defense and major scientific projects. [0003] Superconductivity was first discovered in mercury by Dutch physicist Onnes in 1911. It refers to the phenomenon that the resistance of a superconductor suddenly disappears when the temperature drops to a certain value. This characteristic temperature is defined as the critical transition temp...

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Problems solved by technology

However, the high-temperature superconducting tape, which is the main component of the high-temperature superconducting magnet, is generally in the environment of high voltage and strong magnetic field, so it is difficult to monitor the temperature, current and voltage.

Especially for high-temperature superconducting magnets under conduction cooling conditions, it is not only necessary to monitor them quickly and accurately, but also the monitoring system itself must ensure that external heat cannot be introduced casually, which will aggravate the danger of potential hot spots, because for the second In the first generation of high-temperature superconducting strips, the superconducting layer of the strip itself is very thin, and the volume of the superconducting strip per unit length is small, so the heat capacity is small, and the temperature rises quickly when the timeout is lost. Once the temperature is overheated, it is very easy to burn out, which will cause the entire magnet system quench and burn

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