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Geometric focusing of intense pulsed ion beams from racetrack type magnetically insulated diodes

Published online by Cambridge University Press:  09 March 2009

K. Yatsui ,
A. Tokuchi ,
H. Tanaka ,
H. Ishizuka ,
A. Kawai ,
E. Sai ,
K. Masugata ,
M. Ito  and
M. Matsui
K. Yatsui
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
A. Tokuchi
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
H. Tanaka
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
H. Ishizuka
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
A. Kawai
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
E. Sai
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
K. Masugata
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
M. Ito
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
M. Matsui
Affiliation:
Laboratory of Beam-Fusion Technology, The Technological University of Nagaoka, Nagaoka, Niigata 949-54, Japan
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Abstract

Focusing properties and mechanisms are experimentally investigated of an intense pulsed light-ion beam or a medium-mass ion beam extracted from racetrack type magnetically insulated diodes. Quantitative determinations are made for three factors that affect the focusing ability of the beam, i.e., local divergence angle, deviation angle from ideal trajectory and space-charge effect. Behaviour of electrons in an anodecathode gap as well as neutralizing process of the ion beam by electrons are studied in connection with beam focusing. It is found that there is a close correlation between ion yield and electron irradiation on the anode. By adopting a perforated cathode instead of a vane cathode to ensure good uniformity of electric field in the accelerating gap, we have succeeded in significantly reducing the divergence angle. Several new diagnostic techniques and methods have been developed, yielding information such as the time-resolved trajectory and profile or incident angle of the beam. Electron temperature of the anode plasma is theoretically anticipated from the ions observed experimentally. From an estimate of beam divergence due to a space-charge effect, it is suggested that ‘breakeven’ can be achieved without using conventional z-discharged plasma channels if a bunch of boron beams is utilized.

Type
Research Article
Information
Laser and Particle Beams , Volume 3 , Issue 2 , May 1985 , pp. 119 - 155
Copyright
Copyright © Cambridge University Press 1985

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