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X-ray fine structure of dense plasma in a co-axial accelerator

Published online by Cambridge University Press:  13 March 2009

W. H. Bostick ,
V. Nardi  and
W. Prior
W. H. Bostick
Affiliation:
Physics Department, Stevens Institure of Technology, Hoboken, New Jersey
V. Nardi
Affiliation:
Physics Department, Stevens Institure of Technology, Hoboken, New Jersey
W. Prior
Affiliation:
Physics Department, Stevens Institure of Technology, Hoboken, New Jersey
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Abstract

The intensity of X-ray sources in a focused deuterium plasma produced by a coaxial accelerator has been analysed as a function of position, X-ray energy and time of emission. The X-ray source in the axial region can be resolved (by micro- densitometer readings on X-ray pinhole camera films) as a sequence of small sources (linear dimension ∼ 0.1–0.3 mm) of hard radiation ≳ 2 ke V inside a more diffused source (cylindrical region of 1–4mm diameter) of softer X-rays. In each discharge the point sources are distributed for the most part in the general axial region of the discharge and two or more sources with different radial positions can be frequently observed for one specific value of the axial co-ordinate. Images of localized X-ray sources are also observed in the off-axis halo region. Multiple repinching of the axial plasma column or emission from metal-vapour clouds (by anode bombardment) can be ruled out in this experiment (hollow central electrode, or anode, radius 3·4 cm). The source multiplicity can be related to a complex (filamentary) structure of the plasma.

Type
Research Article
Information
Journal of Plasma Physics , Volume 8 , Issue 1 , August 1972 , pp. 7 - 20
Copyright
Copyright © Cambridge University Press 1972

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