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Nonlinear physics and energetic particle transport features of the beam–plasma instability

Part of: Complex Plasma Phenomena

Published online by Cambridge University Press:  17 August 2015

Nakia Carlevaro ,
Matteo V. Falessi ,
Giovanni Montani  and
Fulvio Zonca
Nakia Carlevaro*
Affiliation:
ENEA for EUROfusion, Via E. Fermi, 45 (00044) Frascati (Roma), Italy
Matteo V. Falessi
Affiliation:
Department of Physics, ‘RomaTre’ University, Via della Vasca Navale, 84 (00146) Roma, Italy
Giovanni Montani
Affiliation:
ENEA for EUROfusion, Via E. Fermi, 45 (00044) Frascati (Roma), Italy Department of Physics, ‘Sapienza’ University of Rome, P.le Aldo Moro, 5 (00185) Roma, Italy
Fulvio Zonca
Affiliation:
ENEA for EUROfusion, Via E. Fermi, 45 (00044) Frascati (Roma), Italy
*
†Email address for correspondence: [email protected]
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Abstract

In this paper we study transport features of a one-dimensional beam–plasma system in the presence of multiple resonances. As a model description of the general problem of a warm energetic particle beam, we assume $n$ cold supra-thermal beams and investigate the self-consistent evolution in the presence of the complete spectrum of nearly degenerate Langmuir modes. A qualitative transport estimation is obtained by computing the Lagrangian Coherent Structures of the system on given temporal scales. This leads to the splitting of the phase space into regions where the local transport processes are relatively faster. The general theoretical framework is applied to the case of the nonlinear dynamics of two cold beams, for which numerical simulation results are illustrated and analysed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 5 , October 2015 , 495810515
Copyright
© Cambridge University Press 2015 

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