In superconducting system, current lead connecting cryogenic device and normal temperature copper cable is the main leakage heat source of entire system. Its performance directly affects cooling cost of cryogenic system. Multi-current leads have advantages of eliminating Joule heat and reducing heat conduction leakage. As a commonly superconducting material, MgB2(magnesium diboride) has broad application prospects. In this paper, the current lead of 200 A MgB2 cable and normal temperature copper cable are designed and calculated. The heat transfer power of superconducting section and the conventional current lead section are 17.90 W and 18 W, respectively. The numerical simulation method is used to verify and analyze calculation results. The temperature at interface between normal temperature copper wire and current lead is lower than 70 K.

中文翻译：

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MgB2超导电流引线的结构与漏热


在超导系统中，连接低温装置和常温铜电缆的电流引线是整个系统的主要泄漏热源。其性能直接影响低温系统的冷却成本。多电流引线具有消除焦耳热、减少热传导泄漏的优点。 MgB2（二硼化镁）作为一种常用的超导材料，具有广阔的应用前景。本文对200A MgB2电缆和常温铜电缆的电流导程进行了设计和计算。超导段和常规电流引线段的传热功率分别为17.90 W和18 W。采用数值模拟方法对计算结果进行验证和分析。常温铜线与电流引线界面温度低于70K。