摘要
为了克服目前潘宁(PIG)离子源中子管引出正离子所带来的诸多不利因素,使用PIG型氢负离子源作为中子管的离子源,研究了氢负离子产生的机理,以期在中子管中获得应用。给出了PIG离子源结构,根据氢负离子产生的方式和条件,结合CST软件仿真实验,确定在对阴极和引出孔附近区域存在氢负离子,而且是氢负离子密度比较大的区域。实验中,通过负离子源产生系统证实了氢负离子的存在及分布规律,中子监测仪测量自成靶50mm负离子源陶瓷中子管,中子产额较传统正离子中子管高出一个数量级以上。
In order to overcome the adverse factors which were brought in by the extraction of positive ions from PIG ion source for neutron tube currently. PIG negative hydride ion source was used as an ion source for neutron tube. Authors investiga ted the generation mechanism of hydride ions by PIG ion source,which was expected to be applied to neutron tube. The structure of a PIG ion source was given. According to the mode and conditions of hydride ions generation, and to combine with the CST- based simulation experiments, the existence of dense hydride ions placed around opposite cathode and extraction hole was con firmed. In the experiments, the presence and regularity of distribution of hydride ions were proven by the negative ion source generation system, the yield of the Ф50 mm neutron tube with negative ion source and drive-in target was more than one order of magnitude of that of the conventional neutron tube with positive ion source.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第2期238-242,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11275046
11305034)
中央高校基本科研业务费专项资金项目(12QNJJ009)
