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Thermalization of a beam by beam-plasma interaction

Published online by Cambridge University Press:  13 March 2009

J. H. A. Van Wakeren and
H. J. Hopman
J. H. A. Van Wakeren
Affiliation:
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, Amsterdam
H. J. Hopman
Affiliation:
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, Amsterdam
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Extract

We present measurements proving the successive excitation of two distinct instabilities by electron beam–plasma interaction along a plasma column. The first, appearing near the gun, grows in space, until the beam is trapped in the wave electric field, and decays. In this process the time-averaged distribution function changes, from a δ-type distribution function, into a plateau. This new beam–plasma distribution isalso unstable; and another instability grows until the beam is again trapped. Numerical calculations show that the second instability can be explained, assuming that the beam distribution thermalizes when propagating from the first instability to the second.

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Articles
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Journal of Plasma Physics , Volume 13 , Issue 2 , April 1975, pp. 349 - 360
Copyright
Copyright © Cambridge University Press 1975

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