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Physics of Plasmas / Volume 12 / Issue 5 / INVITED PAPERS / Basic Plasma Phenomena, Waves, Instabilities

Phys. Plasmas 12, 055701 (2005); http://dx.doi.org/10.1063/1.1885006 (8 pages)

Phase mixing and echoes in a pure electron plasma a

a Paper CI1B 2, Bull. Am. Phys. Soc. 49, 57 (2004).
J. H. Yu, C. F. Driscoll, and T. M. O’Neil

Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, California 92093 and Physics Department and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093

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(Received 18 November 2004; accepted 7 February 2005; published online 28 April 2005)

The two-dimensional (2D) fluid echo is a spontaneous appearance of a diocotron wave after two externally excited waves have damped away, explicitly demonstrating the reversible nature of spatial Landau damping. The inviscid damping, or phase mixing, is directly imaged by a low-noise charge-coupled device camera, which shows the spiral wind-up of the density perturbation. Surprisingly, the basic echo characteristics agree with a simple nonlinear ballistic theory that neglects all collective (i.e., mode) effects. Also, the simple 2D picture is violated by end confinement fields that cause vz-dependent θ drifts, so the observed echo must be interpreted as a superposition of separately damping and separately echoing velocity classes. The maximal echo lifetimes agree with a theory describing weak collisional velocity scattering between velocity classes. In addition, large second wave excitations degrade the echo up to 5× faster than collisions.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
  3. ECHO IMAGES
  4. COLLISIONLESS BALLISTIC THEORY
    1. Time of echo appearance
  5. COLLISIONAL IRREVERSIBILITY OF END-FIELD θ DRIFTS
    1. Collisional theory
    2. Comparison with experiments
  6. LARGE AMPLITUDE EFFECT
  7. SUMMARY

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KEYWORDS and PACS

Keywords

echo, plasma nonlinear waves, plasma drift waves, plasma theory, plasma collision processes, plasma flow, plasma ion acoustic waves

PACS

  • 52.35.Dm

    Sound waves

  • 52.35.Kt

    Drift waves

  • 52.35.Mw

    Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

  • 52.20.Fs

    Electron collisions

  • 52.30.-q

    Plasma dynamics and flow

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1885006

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

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

For access to fully linked references, you need to log in.
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