Circular section composite superconducting line based on rare-earth barium-copper-oxide (ReBCO) coating superconductor and niobium-titanium (NbTi) low temperature superconductor

Abstract

The invention relates to a circular section composite superconducting line based on a rare-earth barium-copper-oxide (ReBCO) coated superconductor and a niobium-titanium (NbTi) low temperature superconductor and belongs to the field of superconducting materials. An NbTi low temperature superconducting line with a circular section is coated by the ReBCO coating superconductor, and an Ag welding flux is used for welding a high temperature superconducting coating conductor in a high temperature superconducting coating conductor rolling joint to form a weld joint. According to the circular section composite superconducting line, the ReBCO coating superconductor and the NbTi low temperature superconducting line with the circular section are composited, the characteristics that n value of a ReBCO high temperature superconducting material is far lower than that of a low temperature superconducting material NbTi and superconducting stagnation temperature is high are utilized, so that the engineering current density, the shunting temperature and minimum quench energy are improved, whole voltage of low / high temperature superconducting composite superconducting line is prevented from increasing, temperature rising of the composite superconducting line is lowered, and compared with traditional low temperature and high temperature superconducting magnets, a superconducting magnet is stable in operation, high in efficiency, safe, and applied to a high magnetic field magnetic resonance imaging (MRI) magnet and a nuclear magnetic resonance (NMR) magnet.

Description

technical field [0001] The invention belongs to the field of practical superconducting materials, in particular to a circular cross-section composite superconducting wire based on a ReBCO coating superconductor and a NbTi low-temperature superconductor. Background technique [0002] Superconductors include high temperature superconductors and low temperature superconductors. The transition from a superconducting state to a normal state is very different for high-temperature superconductors and low-temperature superconductors. Especially for low-temperature superconducting materials, the transition from superconducting state to normal state is very fast, that is, its n value is large; while the transition from superconducting state to normal state for high-temperature superconducting materials is much slower than that of low-temperature superconducting materials , and its n value is relatively small. The current-voltage superconducting characteristics (V-I characteristics) ...

AI Technical Summary

Problems solved by technology

By using high thermal conductivity and high electrical conductivity metals (such as copper, silver, and alloys, etc.) At the same time, when the metal substrate is shunted, Joule heat will be generated

If it cannot be transmitted in time, the temperature of the low-temperature superconductor will rise rapidly, resulting in the quenching of the superconductor.

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