长脉冲高功率负离子源实验平台量热靶研制  

Development of Calorimeter Target for Long Pulse High Power Negative Ion Source Test Platform

作　　者：周红霞[1] 万银祥 周博文[1] 余珮炫 唐珮钦 魏会领[1] ZHOU Hongxia;WAN Yinxiang;ZHOU Bowen;YU Peixuan;TANG Peiqin;WEI Huiling(Southwest Institute of Physics,China National Nuclear Corporation,Chengdu 610041,Sichuan,China)

机构地区：[1]中国核工业集团公司核工业西南物理研究院,四川成都610041

出　　处：《南方能源建设》2024年第3期81-86,共6页Southern Energy Construction

基　　金：国家自然科学基金联合基金项目/重点支持项目/区域创新发展联合基金“强流长脉冲负氢离子源引出束综合性能优化研究”(U19A20112);四川省科技计划“负氢离子源中电子行为对负氢离子产生效率的研究”(2022JDRC0094);西南物理研究院创新项目“基于负离子源的HL-2M装置NNBI离子源研发及束线设计”(201901XWCXRZ001)。

摘　　要：[目的]高能、强流、长脉冲中性束负离子源技术是磁约束聚变堆等离子体达到燃烧条件的核心技术之一。为满足长脉冲高功率负离子源实验平台200 kV/20 A参数下的束诊断需求,研制了用于截获负离子束或中性束、诊断两种束功率密度分布和束发散角以及负离子的中性化效率等性能参数的量热靶。[方法]根据现有的实验平台真空室结构和引出电极尺寸,利用matlab程序获得了该参数下,束发散角为1°时的负离子束在量热靶前端处的功率密度分布和束斑尺寸,进而设计了V字形靶板的量热靶物理结构;在此基础上采用Workbench软件对无氧铜V字形靶板结构进行满功率运行状态下的热负荷模拟计算,获得了水流量为80 m~3/h条件下的量热靶长脉冲运行时的温度分布,最高温度为610℃。[结果]根据模拟计算结果,结合实验平台工程结构和诊断需求,完成了量热靶的工程设计。[结论]量热靶采用磁流体真空密封,实现V字形靶板开合,靶板背面布置了热电偶阵列实时监测靶板温度。量热靶工程结构紧凑,安装尺寸能够兼容离子束流诊断真空室和中性束流诊断真空室,满足诊断需求,能够长脉冲安全运行。[Introduction]High energy,strong current,and long pulse neutral beam negative ion source technology are one of the core technologies for achieving combustion conditions in magnetic confinement fusion reactor plasma.To meet the beam diagnostic requirements of the long pulse high-power negative ion source experimental platform under the parameters of 200 kV/20 A,a calorimeter target has been developed for intercepting negative ion beams or neutral beams,diagnosing the power density distribution and beam divergence angle of the two beams,as well as the neutralization efficiency of negative ions and other performance parameters.[Method]Based on the existing structure of the experimental platform vacuum chamber and the size of the extraction electrode,the Matlab program was used to obtain the power density distribution and beam spot size of the negative ion beam generated by the negative ion source at the front end of the calorimeter target at a beam divergence angle of 1°under this parameter.Subsequently,the physical structure of the calorimeter target with a V-shaped target plate was designed.On this basis,Workbench software was used to simulate the thermal load of the oxygen-free copper V-shaped target plate structure under full power operation and obtain the temperature distribution of the calorimeter target during long pulse operation with a water flow rate of 80 m3/h.The highest temperature was 610°C.[Results]Based on the simulation calculation results,and in combination with the engineering structure and diagnostic requirements of the experimental platform,the engineering design of the calorimeter target was completed.[Conclusion]The calorimeter target adopts magnetic fluid vacuum sealing to achieve the opening and closing of the V-shaped target plate,and a thermocouple array is arranged on the back of the target plate to monitor the temperature of the target plate in real time.The calorimeter target engineering has a compact structure,and its installation size can be compatible with ion beam diagnostic vacuu

关 键 词：负离子源 中性束 量热靶 热负荷 核聚变 

分 类 号：TL6[核科学技术—核技术及应用] TL67