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Electron cyclotron echoes from plasma

Published online by Cambridge University Press:  13 March 2009

R. L. Bruce
R. L. Bruce
Affiliation:
Institute for Plasma Research, Stanford University
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Abstract

The observed response of a low-density magnetoplasma column to a pair of RF pulses near the cyclotron frequency is a series of pulses known as two-pulse echoes. A similar three-pulse echo train may be obtained by applying a third pulse. This behaviour involves some type of non-linearity, and for a low-density plasma the most promising mechanism appears to be velocity-dependent electron-neutral collisions. This gives velocity-dependent decay to induced currents, and velocity-dependent diffusion. The latter may be important in three-pulse echo formation. In this paper computations from these theories are compared with experimental data with these findings: (1) diffusion is not primarily responsible for three-pulse echoes; (2) the predictions of the collisional current decay theory are in reasonable agreement with the experimental results.

Type
Research Article
Information
Journal of Plasma Physics , Volume 5 , Issue 3 , June 1971 , pp. 385 - 411
Copyright
Copyright © Cambridge University Press 1971

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