6kA气冷二元电流引线优化

Optimization of 6 kA gas-cooled binary current lead

为了开展高温超导导体实验研究,中国科学院等离子体物理研究所正在建设背场达6 T,最大测试电流为30 kA的超导导体测试装置。在进行高温超导导体测试时,要为背场磁体提供约6 kA的电流。为了减少电流引线的漏热,设计了自洽气冷二元电流引线,主要由铜换热器段及高温超导段组成。并以电流引线低温端漏热最小及低温端漏热使得的液氦蒸发量等于冷却电流引线所需的氦气量为依据,采用自编c程序对电流引线的尺寸进行优化。同时从简化结构、增加对流换热系数的角度出发,设计出换热效率高、满足换热需求的铜换热器。

In order to carry out experimental research on high temperature superconducting conductor, Institute of Plasma Physics, Chinese Academy of Sciences （ASIPP） is now building a test facility with maximum background field of 6T and maxi- mum test current of 30kA. During the test of high -temperature superconducting conductor, it is necessary to provide a maximum current of about 6kA for the background magnet. For the purpose of reducing the heat leakage through the current lead, a pair of gas - cooled binary current lead was designed, which was mainly composed of copper heat exchanger part and high temperature superconducting part. A newly self - programmed c program was used to optimize the dimensions of the current lead with the goal of minimizing the heat leakage through the current lead and making sure that the mass flow rate of helium gas evaporated by heat leakage is equal to the required helium gas for cooling the current lead. And from the view of simplifying the structure and increasing the convective heat transfer coefficient, a new copper heat exchanger was designed and the capacity of heat transfer was checked.