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Spectral analysis of forced turbulence in a non-neutral plasma

Part of: PLA The Vlasov Equation

Published online by Cambridge University Press:  21 June 2017

S. Chen ,
G. Maero  and
M. Romé
S. Chen
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China
G. Maero
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
M. Romé*
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
*
†Email address for correspondence: massimiliano.rome@mi.infn.it
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Abstract

The paper investigates the dynamics of magnetized non-neutral (electron) plasmas subjected to external electric field perturbations. A two-dimensional (2-D) particle-in-cell code is effectively exploited to model this system with a special attention to the role that non-axisymmetric, multipolar radio frequency (RF) drives applied to the cylindrical (circular) boundary play on the insurgence of azimuthal instabilities and the subsequent formation of coherent structures preventing the relaxation to a fully developed turbulent state, when the RF fields are chosen in the frequency range of the low-order fluid modes themselves. The isomorphism of such system with a 2-D inviscid incompressible fluid offers an insight into the details of forced 2-D fluid turbulence. The choice of different initial density (i.e. fluid vorticity) distributions allows for a selection of conditions where different levels of turbulence and intermittency are expected and a range of final states is achieved. Integral and spectral quantities of interest are computed along the flow using a multiresolution analysis based on a wavelet decomposition of both enstrophy and energy 2-D maps. The analysis of a variety of cases shows that the qualitative features of turbulent relaxation are similar in conditions of both free and forced evolution; at the same time, fine details of the flow beyond the self-similarity turbulence properties are highlighted in particular in the formation of structures and their timing, where the influence of the initial conditions and the effect of the external forcing can be distinguished.

Keywords

magnetized plasmasplasma dynamicsplasma simulation
Type
Research Article
Information
Journal of Plasma Physics , Volume 83 , Issue 3 , June 2017 , 705830303
Copyright
© Cambridge University Press 2017 

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