低温波荡器过冷液氮循环的设计与实验研究  

Design and Experimental Study of Subcooled Liquid Nitrogen Circulation for the Cryogenic Permanent Magnet Undulator

作　　者：张祥镇 徐妙富[1] 孙良瑞[1] 李少鹏[1] 陆辉华[1] 葛锐[1] ZHANG Xiangzhen;XU Miaofu;SUN Liangrui;LI Shaopeng;LU Huihua;GE Rui(Key laboratory of Particle Acceleration Physics&Technology,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所粒子加速物理与技术重点实验室,北京100049 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2022年第7期1761-1767,共7页Journal of Engineering Thermophysics

基　　金：国家重大科技基础设施建设项目(发改高技[2015]280号);国家自然科学基金(No.11675207)。

摘　　要：高能同步辐射光源中,波荡器是插入件系统中的最前沿设备,低温可大幅提高其内禀矫顽力和峰值场强。本文设计了“过冷液氮迫流冷却循环”,采用全真空绝热设计,分析了稳压的理论本质,并提出了新的稳压方式。搭建实验台,对过冷液氮迫流循环的稳定机制、载冷能力和热力学性质等进行了实验研究。结果表明,过冷液氮迫流冷却循环可长期保持,压力波动控制在±300 Pa范围内,验证了稳压机制的理论分析,达到同类设备的最佳水平。低温波荡器磁结构冷却在80 K左右,载冷量可以达到1000 W以上,达到高能同步辐射光源装置要求的各项指标。Undulators are the most advanced insertion devices of the High Energy Photon Source(HEPS),of which the remanence and the intrinsic coercivity can be improved significantly through the low temperature.The subcooled liquid nitrogen circulation for the pressure cooling was designed.The circulation pressure stabilization was analyzed theoretically and a novel pressure stabilization method was proposed.The whole cold part was set into a vacuum box and separated from the atmosphere.The pressure stability mechanism,the cold transfer performance and the thermodynamic property of the circulation was studied experimentally.According to the results,the subcooled liquid nitrogen circulation was established and maintained long time.The pressure stability can be optimized into ±300 Pa,which verifies the theoretical analysis of the stability mechanism.The stability performance is at the advanced level in the facilities alike.The magnet structure was cooled near 80K and the cold transfer capacity was more than 1000 W,which meet the requirements of the HEPS.

关 键 词：低温波荡器 过冷液氮循环 高能同步辐射光源 

分 类 号：TB65[一般工业技术—制冷工程]