Journal ArticleDOI
The theory and characteristics of an efficient surface wave launcher (surfatron) producing long plasma columns
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In this paper, a wave-launching structure called a surfatron is proposed for long plasma columns, in many instances preferable to the positive columns of DC discharges, can be obtained by means of a UHF surface wave propagating along the column.Abstract:
Long plasma columns, in many instances preferable to the positive columns of DC discharges, can be obtained by means of a UHF surface wave propagating along the column. This is possible through the use of a novel wave-launching structure, called a surfatron. The launcher is compact and located on the outside of the dielectric tube containing the plasma. The surfatron is described and analysed in terms of an equivalent circuit theory. Guidelines for its design and operation are given.read more
Citations
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Journal ArticleDOI
Plasma sources based on the propagation of electromagnetic surface waves
Michel Moisan,Z. Zakrzewski +1 more
TL;DR: In this article, the physical principles of operation and the design of surface-wave plasma sources are discussed and a unified description of several compact, efficient, and easy to operate launchers specifically intended for plasma generation that have been developed over the past fifteen years.
Journal ArticleDOI
Using the flowing afterglow of a plasma to inactivate Bacillus subtilis spores: Influence of the operating conditions
S. Moreau,Michel Moisan,Maryam Tabrizian,Jean Barbeau,Jocelyne Pelletier,A. Ricard,L'h. Yahia +6 more
TL;DR: In this article, a parametric study of the operating conditions of such a system was conducted, which showed that the species participating in the killing of spores are oxygen atoms and ultraviolet (UV) photons.
Journal ArticleDOI
Axial electron density and wave power distributions along a plasma column sustained by the propagation of a surface microwave
TL;DR: In this paper, the relation between the axial distribution of the electron density observed along the plasma column and the corresponding power distribution of surface wave that produces it is investigated, and it is found that the electron densities decrease almost linearly along the column in the direction of the wave propagation.
Journal ArticleDOI
An Abel inversion method for radially resolved measurements in the axial injection torch
TL;DR: In this paper, a method for the radial analysis of the plasma torch produced by the axial injection torch device at atmospheric pressure is proposed, which uses a fast high-resolution acquisition set-up including an intensified charge coupled device and an image rotation system, as well as a new data processing procedure based on the Abel inversion technique.
Journal ArticleDOI
Modelling of a low-pressure plasma column sustained by a surface wave
TL;DR: In this paper, a complete theoretical description of a low-pressure cylindrical plasma column sustained by a weakly damped surface wave is derived in which the equations describing the steady-state plasma maintenance conditions are coupled with the surface wave propagation and attenuation characteristics.
References
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Journal ArticleDOI
Space Charge Waves in Cylindrical Plasma Columns
A. W. Trivelpiece,Roy W. Gould +1 more
TL;DR: In this paper, the effect of a steady axial magnetic field is considered, but motion of heavy ions and electron temperature effects are neglected, and the properties of these space charge waves have been investigated by regarding the plasma as a dielectric and solving the resulting field equations.
Journal ArticleDOI
A Small Microwave Plasma Source for Long Column Production without Magnetic Field
TL;DR: In this paper, a new HF device is described, which allows the production of long plasma columns from a small HF coupling structure situated at one end of the column, which can work at pressures from 2 mTorr to 20 Torr with electron densities from 1010 cm-3 to 1013 cm −3 depending on plasma diameter and HF power.
Journal ArticleDOI
Attenuation of a surface wave in an unmagnetized RF plasma column
TL;DR: In this paper, a simple theory of collisional attenuation, obtained by extension of the collisionless theory to the case of few collisions, predicts very well the dependence of the attenuation on the electron density, the electron collision frequency, and the geometry of the plasma column.
Journal ArticleDOI
Comparison of two new microwave plasma sources for HF chemical lasers
TL;DR: In this article, the performances of two microwave sources used to produce fluorine atoms by dissociation of SF 6 for a CW hydrogen fluoride chemical laser are compared, and the results show that the slow-wave structure can sustain higher microwave power, providing larger laser output power.
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