SHINE超导波荡器样机电流引线冷却设计及测试  

Cooling design and test for current leads of SHINE superconducting undulator prototype

作　　者：汤启升[1,2,3] 周巧根 吴腾马[3] 张继东 樊凯 丁祎 文雍梅 TANG Qisheng;ZHOU Qiaogen;WU Tengma;ZHANG Jidong;FAN Kai;DING Yi;WEN Yongmei(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院上海高等研究院,上海201204

出　　处：《核技术》2022年第11期13-21,共9页Nuclear Techniques

基　　金：上海市市级科技重大专项(No.2017SHZDZX02)资助。

摘　　要：在上海硬X射线自由电子装置(Shanghai High Repetition rate XFEL and Extreme light facility,SHINE)中正在研制的超导波荡器样机磁隙小至5 mm、磁体长至4 m、磁场强至1.58 T。电流引线的冷却是样机正常工作的一个关键问题。因为该样机恒温器内没有制冷机冷头,利用外部独立的制冷系统输送进样机内部的低温氦气来冷却电流引线;利用冷屏中部的导冷组件来传递常导铜引线产生的热量;通过仿真优化了常导铜引线的热负载;在恒温器测试中设计了超导辅助带材以电连通高温超导引线(High Temperature Superconducting Current Lead,HTS)的冷端。从测试中得到HTS热端与低温氦气之间温差小于20 K,且所有电流引线在满负载下正常工作。结果表明:在该样机中利用低温氦气冷却管通过导冷方式来冷却电流引线的方案可行。[Background]Superconducting undulator(SCU)prototype with small magnet gap of 5 mm,long magnet length of 4 m and high magnet field of 1.58 T was being developed at Shanghai High Repetition rate XFEL and Extreme light facility(SHINE).Compared to any other superconducting undulator,there is no cryocooler being installed on the cryostat in this SCU prototype.[Purpose]This study aims at the cooling design for the binary current leads for SCU's normal operating.[Methods]Binary current leads composed of normal conductive copper leads and high temperature superconducting current leads(HTS)were adopted for SCU to connect superconducting coils inside the cryostat and outer cables.Low-temperature helium gas was used to transport independent refrigerator system to the cooling tubes inside the prototype,hence the binary current leads were cooled.Thermal conduction components installed on the middle of the thermal shield were employed to transfer heat load of normal conductive copper leads,and heat load of copper leads was optimized by simulation.Auxiliary superconducting rods were designed for connecting cold ends of HTS in the cryostat test.[Results]The temperature difference between hot ends of HTS and low-temperature helium gas is less than 20 K from the result of cryostat test,all binary current leads is operating normally with full current.[Conclusions]It is practicable to use cooling tubes with low-temperature helium gas to cool binary current leads of the SCU prototype by thermal conduction,which is different from cooling solution for current leads in any other SCU being developed presently.

关 键 词：超导波荡器 低温氦气 恒温器 二元电流引线 冷却 

分 类 号：TL503.8[核科学技术—核技术及应用]