TITLE

Analytic model of electron beam thermalization during the resistive Weibel instability

AUTHOR(S)
Siemon, Carl; Khudik, Vladimir; Shvets, Gennady
PUB. DATE
October 2011
SOURCE
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A novel theoretical model for underdense electron beam propagation during the nonlinear stage of the resistive Weibel instability (WI) is presented and is used to calculate the stopping time of the beam. The model and supporting simulation results lead to the conclusion that the WI initially enhances beam deceleration but then reduces it when compared to a filamentation-suppressed beam (without WI), so that the overall stopping time of the beam is essentially unaffected by the instability. Using the theoretical model, a criterion is derived that determines when deceleration is no longer enhanced by the instability. We also demonstrate that exotic plasma return current distributions can be obtained within and outside of beam filaments that sharply contrast those observed in collisionless systems. For example, the plasma return current is reversed in selected areas.
ACCESSION #
66903301

 

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