螺线管离子源的模拟与分析

Simulation and analysis of solenoidal ion sources.

作者信息

Alderwick A R, Jardine A P, Hedgeland H, MacLaren D A, Allison W, Ellis J

机构信息

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

出版信息

Rev Sci Instrum. 2008 Dec;79(12):123301. doi: 10.1063/1.3030858.

DOI:10.1063/1.3030858

PMID:19123556

Abstract

We present a detailed analysis and simulation of solenoidal, magnetically confined electron bombardment ion sources, aimed at molecular beam detection. The aim is to achieve high efficiency for singly ionized species while minimizing multiple ionization. Electron space charge plays a major role and we apply combined ray tracing and finite element simulations to determine the properties of a realistic geometry. The factors controlling electron injection and ion extraction are discussed. The results from simulations are benchmarked against experimental measurements on a prototype source.

摘要

我们对用于分子束检测的螺线管磁约束电子轰击离子源进行了详细分析和模拟。目的是在将多重电离降至最低的同时，实现单电离物种的高效率。电子空间电荷起着主要作用，我们应用射线追踪和有限元模拟相结合的方法来确定实际几何结构的特性。讨论了控制电子注入和离子提取的因素。模拟结果与原型源的实验测量结果进行了对比。