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Mode-analytical Examination of Vortex Dynamics of a Pure Electron Plasma in the Relaxation to a Meta-equilibrium Distribution.
- Source :
-
AIP Conference Proceedings . 2006, Vol. 862 Issue 1, p39-44. 6p. 3 Diagrams, 4 Graphs. - Publication Year :
- 2006
-
Abstract
- Vortex patches of intense density generated by the diocotron instability in a magnetized pure electron plasma merge each other accompanied by the production of filaments and finally relax to a bell shape distribution surrounded by a halo of low-density electrons. Here we reexamine the vortical dynamics in terms of the time evolution of the power spectrum in the mode-number space. Triggered by the instability, the initial axisymmetric ring distribution is deformed and torn into mesoscopic blobs, and a distribution of radial flux is generated around the blobs. In the merging process between vortex patches, the energy spectrum expands toward higher mode-number space, while the dominant mode shifts downward to lower mode numbers as this process proceeds. The turbulent period characterized by the repeated mergers is accompanied by a fast reduction of the enstrophy. During this relaxation the energy and the angular momentum of the whole plasma system remain conserved. In a slow process after the rapid relaxation a convex profile appears in the density distribution accompanied by the recovery of a symmetric distribution of the azimuthal flux. The spectra in the final state concentrate at symmetric modes with a slight contribution from orbiting motion of the plasma column. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0094243X
- Volume :
- 862
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- AIP Conference Proceedings
- Publication Type :
- Conference
- Accession number :
- 23064341
- Full Text :
- https://doi.org/10.1063/1.2387905