中子慢化器低温及真空性能测试系统设计  

Self-Developed Test Platform for Evaluation of Operation Conditions of Neutron Moderator

作　　者：周能涛 吴杰峰[1] 丁开忠[1] 胡春明[2] 林力 余朝举[2] 朱志刚[1] 卢禹 叶斌 郑永培 Zhou Nengtao;Wu Jiefeng;Ding Kaizhong;Hu Chunming;Lin Li;Yu Chaoju;Zhu Zhigang;Lu Yu;Ye Bin;Zheng Yongpei(Insititute of Plasma Phsicas,Chinese Academy of Sciences,Hefei 230031,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Hefei Juneng Electro Physics High-Tech Development Co.,Lid.,Hefei 230031,China;Hefei Meike Hellium Industry Co.^Ltd.,Hefei 230088,China)

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科学院高能物理研究所,北京100049 [3]合肥聚能电物理高技术开发有限公司,合肥230031 [4]合肥美科氦业有限公司,合肥230088

出　　处：《真空科学与技术学报》2019年第11期944-949,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：中子慢化器低温及真空性能测试系统,用于验证中国散裂中子源氢慢化器的低温性能和真空密封性。此套系统由供液系统、气体加热系统、流量控制系统、温度与压力监测系统组成,采用液氮替代液氢作为测试介质,通过加热器对液氮直接加热的方式获得低温氮气。每根输液管道都是独立的真空单元,配有真空抽口,采用双层不锈钢管道,管道之间做绝热处理。通过控制加热器与内管的装配精度来保证气体换热效率。使用Lakeshore Model 336温控仪和TELEDYNE HASTINGS流量控制器进行气体温度和流量调节。该系统气体输出温度精度达到±5 K,气体输出流量约500 L/min±10%。此套系统不仅为大型低温系统提供安全可靠的低温测试工作介质,同时节约了实验成本,将来在航空航天领域能得以应用推广。A novel test platform was developed for evaluation of the cryogenic,vacuum and sealing conditions of the neutron moderator and hydrogen moderator for China Spallation Neutron Source.The self-developed test platform comprised the liquid-nitrogen supply,heating of gas unit,flow-rate controller,monitoring of temperature subunit,and pressure alarm subunit.The red-copper resistive heaters turn liquid nitrogen into cold gas(80~100 K);and the cryogenic pipelines were thermally insulated.The test platform was used to evaluate the coupled/decoupled posioned hydrogen moderators.The results show that the test platform meets all the stringent design requirements.For example,it is capable of providing cryogenic nitrogen-gas at a flow-rate up to 500 L/min with a tolerance of 10%and a gas temperature control precision of 5±K.We suggest that the test platform be of some technological interest in testing large-sized vacuum and/or cryogenic equipment.

关 键 词：超高真空 低温测试 加热器 流量控制器 低温气体 

分 类 号：TB79[一般工业技术—真空技术]