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Title: Dynamics of Plasma Blobs in a Shear Flow

Abstract

The global dynamic of plasma blobs in a shear flow is investigated in a simple magnetized torus using the spatial Fourier harmonics (k-space) framework. Direct experimental evidence of a linear drift in k space of the density fluctuation energy synchronized with blob events is presented. During this drift, an increase of the fluctuation energy and a production of the kinetic energy associated with blobs are observed. The energy source of the blob is analyzed using an advection-dissipation-type equation that includes blob-flow exchange energy, linear drift in k space, nonlinear processes, and viscous dissipations. We show that blobs tap their energy from the dominant ExB vertical background flow during the linear drift stage. The exchange of energy is unidirectional as there is no evidence that blobs return energy to the flow.

Authors:
; ; ; ; ;  [1]
  1. Centre de Recherches en Physique des Plasmas Association Euratom-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne CH-1015 (Switzerland)
Publication Date:
OSTI Identifier:
21179710
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 101; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevLett.101.115005; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ADVECTION; ELECTROMAGNETIC FIELDS; ENERGY SOURCES; EQUATIONS; HARMONICS; KINETIC ENERGY; NONLINEAR PROBLEMS; PLASMA; SHEAR

Citation Formats

Diallo, A., Fasoli, A., Furno, I., Labit, B., Podesta, M., and Theiler, C.. Dynamics of Plasma Blobs in a Shear Flow. United States: N. p., 2008. Web. doi:10.1103/PHYSREVLETT.101.115005.
Diallo, A., Fasoli, A., Furno, I., Labit, B., Podesta, M., & Theiler, C.. Dynamics of Plasma Blobs in a Shear Flow. United States. doi:10.1103/PHYSREVLETT.101.115005.
Diallo, A., Fasoli, A., Furno, I., Labit, B., Podesta, M., and Theiler, C.. Fri . "Dynamics of Plasma Blobs in a Shear Flow". United States. doi:10.1103/PHYSREVLETT.101.115005.
@article{osti_21179710,
title = {Dynamics of Plasma Blobs in a Shear Flow},
author = {Diallo, A. and Fasoli, A. and Furno, I. and Labit, B. and Podesta, M. and Theiler, C.},
abstractNote = {The global dynamic of plasma blobs in a shear flow is investigated in a simple magnetized torus using the spatial Fourier harmonics (k-space) framework. Direct experimental evidence of a linear drift in k space of the density fluctuation energy synchronized with blob events is presented. During this drift, an increase of the fluctuation energy and a production of the kinetic energy associated with blobs are observed. The energy source of the blob is analyzed using an advection-dissipation-type equation that includes blob-flow exchange energy, linear drift in k space, nonlinear processes, and viscous dissipations. We show that blobs tap their energy from the dominant ExB vertical background flow during the linear drift stage. The exchange of energy is unidirectional as there is no evidence that blobs return energy to the flow.},
doi = {10.1103/PHYSREVLETT.101.115005},
journal = {Physical Review Letters},
number = 11,
volume = 101,
place = {United States},
year = {Fri Sep 12 00:00:00 EDT 2008},
month = {Fri Sep 12 00:00:00 EDT 2008}
}