小型脉冲中子发生器用真空弧离子源研制  

Vacuum arc ion source used in small pulsed neutron generator

作　　者：董攀[1] 蓝朝晖[1] 郑乐 李杰[1] 王韬[1] 杨振 龙继东[1] DONG Pan;LAN Zhaohui;ZHENG Le;LI Jie;WANG Tao;YANG Zhen;LONG Jidong(Institute of Fluid Physics,Chinese Academy of Engineering Physics,Mianyang Sichuan 621999,China;Sichuan XWBank,Chengdu Sichuan 610000,China;Institut Franco-chinois de l’Energie Nucléaire,Sun Yat-sen University,Zhuhai Guangdong 519082,China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621999 [2]四川新网银行股份有限公司,四川成都610000 [3]中山大学中法核工程与技术学院,广东珠海519082

出　　处：《太赫兹科学与电子信息学报》2021年第2期334-337,共4页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(11705181;11975217)。

摘　　要：真空弧离子源以其结构简单、空间紧凑、氘离子流强大等优点,非常适合在小型脉冲中子发生器中使用。本文介绍了一款小型真空弧离子源,它利用氘化钛阴极同时作为氘气源和电极,避免了复杂的气路管道。该离子源外径约20 mm,长25 mm。采用电荷耦合器件(CCD)相机拍摄了该离子源放电光斑,发现弧流越大,光斑越大。采用偏压平板测量了该离子源的饱和离子流,当弧流大于100 A时,饱和离子流可达1 A以上。采用磁分析测量了等离子体中氘离子比例,结果表明氘离子比例随弧流增加而增加,最大约为27%。最后测量了该离子源在120 kV高压下打氘靶的中子产额,当弧流为100 A,脉宽为5μs时,中子产额约1×10^(5) n。该源可应用在小型脉冲中子发生器中。Vacuum arc ion source is suitable for miniaturized pulse neutron generator because of its simple structure and high deuterium ion density.A small vacuum arc ion source is developed with the diameter of 20 mm and the length of 25 mm.TiD works both as the cathode and as deuterium source,which avoids using the complicated gas pipes.The light spots caused by the ion source are measured by a Charge Coupled Device(CCD)camera.It is found that the larger the arc current,the brighter the spots.The saturated ion current is measured by a biased plate.When the arc current is larger than 100 A,the saturated ion current could be above 1 A.The deuterium ion ratio in the plasma is measured by a simple magnetic analysis.The ratios grow with the arc current,and the maximum is about 27%.When the arc current is 100 A and the pulse duration is 5μs,the neutron yield is about 1×10^(5) n for the TiD target under 120 kV voltage.The source can be used in small pulsed neutron generators suitably.

关 键 词：脉冲中子发生器 真空弧放电 离子源 

分 类 号：TN784[电子电信—电路与系统] O461.2[理学—电子物理学]