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高纯铜材是超导磁体热稳定的保障,因而知晓它的热电磁特性是低温超导应用中必不可少的依据。本文研究了高纯铜线的热导率、电阻率以及磁阻等特性,给出了必要的实验数据。结合高纯铜材在超导方面的应用,本文首次报道了铜线表面在过冷态超流氦(HeⅡp)中的传热特性,所采用的传热试样为复合铜材的NbTi超导线以及高纯铜线。由于高纯铜材固有的电磁性能,在HeⅡp中对于一定的脉冲时间其可承受较超导线更高的脉冲电流密度,因而文中推测用高纯铜或高纯铝材制作由HeⅡp冷却的脉冲磁体可激发较超导磁体更加高强的脉冲磁场。
High-purity copper is the thermal stability of the superconducting magnet protection, and therefore know its thermal electromagnetic properties of low-temperature superconductor applications indispensable basis. In this paper, the thermal conductivity, resistivity and reluctance of high-purity copper wire are studied, and the necessary experimental data are given. Combined with the application of high purity copper in superconductivity, the paper first reported the heat transfer characteristics of copper surface in He Ⅱ p superheated superconducting helium (HeⅡp). The heat transfer samples used were NbTi superconducting wire And high-purity copper wire. Due to the inherent electromagnetic properties of high-purity copper, it can withstand pulsed current density higher than superconducting wire for certain pulse time in HeⅡp. Therefore, it is presumed that pulsed magnet cooled by HeⅡp with high purity copper or high purity aluminum Can be more powerful than the superconducting magnet pulsed magnetic field.