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Effect of initial conditions on electron–plasma turbulence: a multiresolution analysis

Part of: Complex Plasma Phenomena

Published online by Cambridge University Press:  13 July 2015

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

The transverse dynamics of a pure electron plasma confined in a Penning–Malmberg trap is investigated, taking advantage of two-dimensional particle-in-cell numerical simulations. The evolution of the electron plasma turbulence is studied by means of a wavelet-based multiresolution analysis. In particular, a modified recursive denoising algorithm is developed to separate coherent and incoherent (not necessarily homogeneous) components of the flow. A set of simulations have been carried out changing systematically the radii of an initial annular density distribution of the electrons. The results of the multiresolution analysis indicate that the initial density configuration may have a considerable effect on the evolution of turbulence. Even very small initial density fluctuations can lead to quite different final states, especially in the presence of multiple active diocotron modes characterized by similar growth rates.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 5 , October 2015 , 495810511
Copyright
© Cambridge University Press 2015 

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