限口法拉第筒的研制  

Limited opening faraday cup

作　　者：苏丹[1,2] 林敏[2] 陈义珍[2] 孟宪芳[2] 陈克胜[2] 徐利军[2] 徐进章[1] 

机构地区：[1]兰州大学,兰州250022 [2]中国原子能科学研究院,北京102413

出　　处：《核技术》2008年第10期766-768,共3页Nuclear Techniques

摘　　要：自行研制了一种限口法拉第筒,用于确定20 MeV以下能量质子入射到不同材料中的吸收剂量。与传统法拉第筒相比,限口法拉第筒的改进在于:抑制电极由外筒和回弯环两部分构成,回弯环改变了法拉第筒的电场分布,增强了电场对次级电子的束缚能力.减小了对入射离子束的影响,提高了测量的准确度。A limited opening faraday cup （LOFC） was designed to determine the absorbed dose in different materials of incident proton with energy below 20 MeV. Compared with the traditional FC, the main difference is on the suppressor electrode, which is composed of the outer cup and the tight circle. The distribution of electric field is influenced by the tight circle that could suppress the ejection of secondary electrons effectively, without affecting the ion beam. And this improves the accuracy of FC.

关 键 词：法拉第筒 次级电子 抑制电压 吸收剂量 

分 类 号：TL81[核科学技术—核技术及应用] O571.1[理学—粒子物理与原子核物理]