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Applied Physics Letters / Volume 96 / Issue 10 / PLASMAS AND ELECTRICAL DISCHARGES

Appl. Phys. Lett. 96, 101503 (2010); http://dx.doi.org/10.1063/1.3354007 (3 pages)

Acoustic stabilization of electric arc instabilities in nontransferred plasma torches

V. Rat and J. F. Coudert

CNRS, University of Limoges, SPTCS UMR6638, 123 Avenue A. Thomas, 87060 Limoges Cedex, France

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(Received 12 January 2010; accepted 15 February 2010; published online 8 March 2010)

Electric arc instabilities in dc plasma torches lead to nonhomogeneous treatments of nanosized solid particles or liquids injected within thermal plasma jets. This paper shows that an additional acoustic resonator mounted on the cathode cavity allows reaching a significant damping of these instabilities, particularly the Helmholtz mode of arc oscillations. The acoustic resonator is coupled with the Helmholtz resonator of the plasma torch limiting the amplitude of arc voltage variations. It is also highlighted that this damping is dependent on friction effects in the acoustic resonator.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

acoustic resonators, arcs (electric), nanoparticles, plasma instability, plasma torches

PACS

  • 52.35.Qz

    Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)

  • 52.75.Hn

    Plasma torches

  • 52.80.Mg

    Arcs; sparks; lightning; atmospheric electricity

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3354007

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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