Issue
EPL
Volume 85, Number 3, February 2009
Article Number 35001
Number of page(s) 6
Section Physics of Gases, Plasmas and Electric Discharges
DOI http://dx.doi.org/10.1209/0295-5075/85/35001
Published online 11 February 2009
EPL, 85 (2009) 35001
DOI: 10.1209/0295-5075/85/35001

Wavelet analysis of two-dimensional turbulence in a pure electron plasma

G. Bettega1 and H. E. Roman2

1   INFN Sezione di Milano and Dipartimento di Fisica, Università degli Studi di Milano - Via Celoria 16, Milano, I-20133, Italy, EU
2   Dipartimento di Fisica, Università di Milano-Bicocca - Piazza della Scienza 3, I-20126 Milano, Italy, EU

eduardo.roman@mib.infn.it

received 21 November 2008; accepted in final form 11 January 2009; published February 2009
published online 11 February 2009

Abstract
Highly magnetized pure electron plasmas confined in Penning-Malmberg traps allow to perform accurate experiments on effective two-dimensional (2D) fluid dynamics under well-controlled experimental conditions. Detailed experimental investigations of free decaying turbulence in a pure electron plasma using multi-resolution analysis (MRA) are presented. Coherent structures are extracted from the flow using a wavelet-based recursive denoising algorithm with an adaptative self-consistent threshold. The scaling behaviors of measured enstrophy and energy distributions are obtained and compared with recent experiments and theoretical predictions for 2D turbulence.

PACS
52.35.Ra - Plasma turbulence.
42.30.-d - Imaging and optical processing.
47.27.Jv - High-Reynolds-number turbulence.

© EPLA 2009