传导冷却高温超导磁体热输运参数反演识别

在传导冷却高温超导磁体系统中，超导磁饼热导率以及磁饼与导冷体之间的界面热阻是影响热输运的主要因素，也是传导冷却超导磁体系统热设计的难点。为了获得准确的热导率和界面热阻参数，根据 Levenberg Marquardt算法提出通过表面测温确定传导冷却超导磁体热输运参数的反演识别方法。搭建低温实验数据测试平台，建立高温超导磁饼三维各向异性热传导模型。利用反演算法对传导冷却Bi2223高温超导磁体在40～76K温区的各向异性热导率与界面热阻进行反演识别，并分析测温误差对识别结果的影响。研究成果将为超导磁体热输运参数的获取提供一种新思路。
In conduction cooling high temperature superconducting (HTS) magnet system, thermal conductivity of HTS magnetic pancakes and thermal boundary resistance between magnetic pancake and cooling body are the major factors affecting heat transport, and the difficult points for the thermal design of conduction cooling HTS magnet as well. A new method, based on the Levenberg-Marquardt algorithm, to simultaneously identify each heat transport parameter from the temperature distribution on the inspection surface was put forward. A low temperature experiment platform was setup, and a three-dimensional orthotropic heat transfer model of magnetic pancake was built. The orthotropic thermal conductivity and thermal boundary resistance of conduction cooling Bi2223 HTS magnet at 45～72 K were obtained with the method mentioned above. The influence of temperature measurement error on identification results was analyzed. The research result provides a new thought for obtaining heat transport parameters of conduction cooling superconducting magnet.