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Temporal and spatial plasma wave echoes

O'Neil, T. M. and Gould, R. W. (1968) Temporal and spatial plasma wave echoes. Physics of Fluids, 11 (1). pp. 134-142. ISSN 1070-6631. doi:10.1063/1.1691746.

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It is shown that, if a longitudinal wave is excited in a collision-free plasma and Landau-damps away, and later a second wave is excited and also damps away, then a third wave will spontaneously appear in the plasma. This wave appears long after the first two waves have damped away at a time proportional to the interval between the first two waves, and is in that sense an echo. It is also shown that, if a wave is continuously excited at one point in a plasma and a second wave is continuously excited many Landau damping lengths from the first point, then a third wave will spontaneously appear many Landau damping lengths from the second point. Fundamentally, plasma wave echoes are possible because of the reversible nature of Landau damping. However, small-angle Coulomb collisions are very effective in destroying the echo.

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Additional Information:© 1968 American Institute of Physics. Received 21 August 1967. The authors wish to thank Dr. J. H. Malmberg for many valuable discussions in the course of this investigation. This research was supported in part by the Air Force Office of Scientific Research under Contract AF49(638)-1564 and in part by the Office of Naval Research under Contract Nonr 220(50).
Group:Electron Tube and Microwave Laboratory
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Air Force Office of Scientific Research (AFOSR)AF49(638)-1546
Office of Naval Research (ONR)220(50)
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Electron Tube and Microwave Laboratory Technical Report38
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3740
Deposited By: Tony Diaz
Deposited On:10 Jul 2006
Last Modified:08 Nov 2021 20:12

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