Aberration of a negative ion beam caused by space charge effect

K Miyamoto; S Wada; A Hatayama

doi:10.1063/1.3298842

Aberration of a negative ion beam caused by space charge effect

Rev Sci Instrum. 2010 Feb;81(2):02A724. doi: 10.1063/1.3298842.

Authors

K Miyamoto¹, S Wada, A Hatayama

Affiliation

¹ Naruto University of Education, 748 Nakashima, Takashima, Naruto-cho, Naruto-shi, Tokushima 772-8502, Japan. kmiyamot@naruto-u.ac.jp

PMID: 20192393
DOI: 10.1063/1.3298842

Abstract

Aberrations are inevitable when the charged particle beams are extracted, accelerated, transmitted, and focused with electrostatic and magnetic fields. In this study, we investigate the aberration of a negative ion accelerator for a neutral beam injector theoretically, especially the spherical aberration caused by the negative ion beam expansion due to the space charge effect. The negative ion current density profiles with the spherical aberration are compared with those without the spherical aberration. It is found that the negative ion current density profiles in a log scale are tailed due to the spherical aberration.