镨铁硼低温波荡器机械结构的传热分析

Heat transfer analysis of PrFeB-based cryogenic permanent magnet undulators mechanic structure

对镨铁硼材料在低温和室温下的热学和力学物性进行了测量;使用实测的镨铁硼物性并结合数值模拟的方法对镨铁硼低温波荡器的传热特性进行了分析;结果表明,磁极和磁极夹持机构与磁铁间的热传导是冷却磁铁的关键因素,冷却管道宜采用双通道同向并联的方式。使用该设计通过液氮可以冷却磁铁至82K,同时能够控制由于温差带来的磁极间相位误差小于0.1度,满足镨铁硼低温波荡器设计要求。

This paper introduced thermal properties and mechanical properties measurement result of PrFeB material. Heat transfer performance of PrFeB - based cryogenic permanent magnet undulators （ CPMU ） was analyzed by numerical simulation methods. Sinmlation result shows that polo and polo - mounting structure are critical to cool down magnets. Besides, double cooling channels were used for each in - vacuum girder. Working temperature of magnets is about 82K while the phase error increases about 0.1 degree.