Early out-of-equilibrium beam-plasma evolution

We solve analytically the out-of-equilibrium initial stage that follows the injection of a radially finite electron beam into a plasma at rest and test it against particle-in-cell simulations. For initial large beam edge gradients and not too large beam radius, compared to the electron skin depth, t...

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Bibliographic Details
Published in:Physical review letters 2006-03, Vol.96 (11), p.115004-115004, Article 115004
Main Authors: Firpo, M-C, Lifschitz, A F, Lefebvre, E, Deutsch, C
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
BEAM-PLASMA SYSTEMS
ELECTRON BEAMS
ELECTRONS
EQUILIBRIUM
EVOLUTION
ISOTROPY
PLASMA
PLASMA INSTABILITY
PLASMA SIMULATION
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Summary:We solve analytically the out-of-equilibrium initial stage that follows the injection of a radially finite electron beam into a plasma at rest and test it against particle-in-cell simulations. For initial large beam edge gradients and not too large beam radius, compared to the electron skin depth, the electron beam is shown to evolve into a ring structure. For low enough transverse temperatures, the filamentation instability eventually proceeds and saturates when transverse isotropy is reached. The analysis accounts for the variety of very recent experimental beam transverse observations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.115004