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Two-dimensional focusing of self-magnetically insulated “Plasma Focus Diode”

Published online by Cambridge University Press:  09 March 2009

Katsumi Masugata ,
Hironobu Isobe ,
Keigo Aga ,
Masami Matsumoto ,
Shigeo Kawata ,
Weihua Jiang  and
Kiyoshi Yatsui
Katsumi Masugata
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Hironobu Isobe
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Keigo Aga
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Masami Matsumoto
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Shigeo Kawata
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Weihua Jiang
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
Kiyoshi Yatsui
Affiliation:
Laboratory of Beam Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-21, Japan
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Abstract

A new and simple type of self-magnetically insulated, vacuum ion diode named “Plasma Focus Diode” has been successfully developed with a large solid angle of irradiation and low divergence angle. The diode has a pair of coaxial cylindrical electrodes similar to a Mather-type plasma focus device. Ion-current density of 1·9 kA/cm2 has been obtained on the anode surface under the experimental conditions of diode voltage ∼1·4 MV, diode current ∼180 kA, and pulse width ∼75 ns. The generated ion beam has been two-dimensionally focused (line focusing) with a focusing radius of ∼0·18 mm, giving a maximum ion current density and beam power density at the axis of ∼0·14 MA/cm2 and ∼0·18 TW/cm2, respectively. The motion of electrons in the gap has been numerically simulated by use of a newly developed particle-in-cell computer simulation code, and good agreement has been obtained between the simulation and the experiment.

Type
Research Article
Information
Laser and Particle Beams , Volume 7 , Issue 2 , May 1989 , pp. 287 - 303
Copyright
Copyright © Cambridge University Press 1989

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