The free-decaying two-dimensional (2D) turbulence in a pure electron plasma confined in the Malmberg-Penning trap ELTRAP is investigated experimentally and analyzed through the Proper Orthogonal Decomposition (POD). POD is used to extract coherent structures of the flow from a sequence of plasma density measurements, which represent the vorticity of the 2D fluid. The coherent structures that are energetically dominant are identified and their spatio-temporal dynamics is studied over the time evolution of turbulence. The results suggests the the dominant POD modes can be identified with diocotron modes which appear to be active during both the onset and relaxation phases of turbulence.
Proper orthogonal decomposition of two-dimensional turbulence in a pure electron plasma / F. Lepreti, M. Romé, R. Pozzoli, A. Vecchio, V. Carbone, G. Maero, B. Paroli, F. Valentini - In: Plasmas in the laboratory and in the Universe : interactions, patterns, and turbulence : Como, Italy, 1-4 December 2009 / [a cura di] G. Bertin, F. De Luca, G. Lodato, R. Pozzoli, M. Romé. - Melville, NY : American institute of physics, 2010. - ISBN 978-0-7354-0787-9. - pp. 306-311 (( convegno Plasmas in the laboratory and the Universe : interactions, patterns, and turbulence : international symposium tenutosi a Como, Italy nel 2009 [10.1063/1.3460139].
Proper orthogonal decomposition of two-dimensional turbulence in a pure electron plasma
M. RoméSecondo
;R. Pozzoli;G. Maero;B. ParoliPenultimo
;
2010
Abstract
The free-decaying two-dimensional (2D) turbulence in a pure electron plasma confined in the Malmberg-Penning trap ELTRAP is investigated experimentally and analyzed through the Proper Orthogonal Decomposition (POD). POD is used to extract coherent structures of the flow from a sequence of plasma density measurements, which represent the vorticity of the 2D fluid. The coherent structures that are energetically dominant are identified and their spatio-temporal dynamics is studied over the time evolution of turbulence. The results suggests the the dominant POD modes can be identified with diocotron modes which appear to be active during both the onset and relaxation phases of turbulence.
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