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2-D Simulation for focus of rotating and propagating ion beam in neutral gas

Published online by Cambridge University Press:  09 March 2009

Takayuki Aoki  and
Keishiro Niu
Takayuki Aoki
Affiliation:
Department of Energy Sciences, the Graduate School at Nagatsuta, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Keishiro Niu
Affiliation:
Department of Energy Sciences, the Graduate School at Nagatsuta, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
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Abstract

Focusing processes of rotating and propagating proton beams in a neutral hydrogen gas are studied numerically by using a two-dimensional hybrid code. Processes including beam impact ionization, plasma avalanche and field emission are taken into consideration. The plasma formation time depends on the initial gas density and the beam intensity. When 2-Torr neutral gas is filled initially, enough plasma density is created by the rising part of the beam pulse, so that the main pulse is focused and forms a rotating and propagatingbeam configuration.

Type
Research Article
Information
Laser and Particle Beams , Volume 8 , Issue 1-2 , January 1990 , pp. 89 - 93
Copyright
Copyright © Cambridge University Press 1990

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