ION-BEAM DIVERGENCE CHARACTERISTICS OF 3-GRID ACCELERATOR SYSTEMS

被引：19

作者：

ASTON, G ^{[1
]}

KAUFMAN, HR ^{[1
]}

机构：

[1] COLORADO STATE UNIV,DEPT MECH ENGN,FT COLLINS,CO 80521

来源：

AIAA JOURNAL | 1979年 / 17卷 / 01期

基金：

美国国家航空航天局;

关键词：

D O I：

10.2514/3.61063

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

A comprehensive experimental investigation of the geometrical and operating conditions which affect most strongly the ion beam divergence of three-grid accelerator systems is presented. Three-grid accelerator systems are shown to offer significant improvements in ion beam focusing over two-grid accelerator systems. These improvements are greatest for low net-to-total accelerating voltage ratios and small screen-to-accelerator grid separation ratios (i.e., high perveance grid sets). Ion beam focusing gains are negligible at a net-to-total accelerating voltage ratio near unity. Low decelerator grid impingement currents and low ion beam divergence angles require that the decelerator hole diameter be about 25% larger than the accelerator hole diameter, and also that the decelerator grid be spaced as close as is practically possible to the accelerator grid. The graphical results contained herein provide guidelines for the design of three-grid ion accelerator systems. © 1979 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.

引用

页码：64 / 70

页数：7