Characteristics of helium ion beams from multicusp source and study of beam transport

M. Sasao, M. Nishiura, S. Guharay, T. Kuroda, M. Hamabe, H. Ramos
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引用次数: 0

Abstract

A test stand with a multicusp type He/sup +/ ion source and an electrostatic transport system was built for the study of beam characteristics at relatively low energy, E<10 keV, and beam transport in a space-charge dominated region with /spl beta/(=v/c)<0.0025. The measured normalized beam emittance (90%) of the He/sup +/ beam extracted from a compact multicusp source is about 0.08 /spl pi/ mm-mrad for the emission current density of about 5-15 mA/cm/sup 2/ at 6-9 kV. An electrostatic quadrupole transport system (ESQ) is designed for this beam. Preliminary experimental results show that the ESQ has a potential to transport a beam without any significant emittance growth over a length of about 50 cm.
多源氦离子束的特性及其输运研究
搭建了多usp型He/sup +/离子源和静电输运系统试验台,研究了E<10 keV的较低能量束流特性和/spl beta/(=v/c)<0.0025的空间电荷主导区束流输运。在6-9 kV的发射电流密度约为5-15 mA/cm/sup 2/时,从紧凑的多usp源中提取的He/sup +/束的归一化束发射度(90%)约为0.08 /spl pi/ mm-mrad。为此设计了静电四极传输系统(ESQ)。初步的实验结果表明,ESQ有可能在大约50厘米的长度上传输光束而没有明显的发射度增长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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