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Title: Formation mechanism of steep wave front in magnetized plasmas

Bifurcation from a streamer to a solitary drift wave is obtained in three dimensional simulation of resistive drift waves in cylindrical plasmas. The solitary drift wave is observed in the regime where the collisional transport is important as well as fluctuation induced transport. The solitary drift wave forms a steep wave front in the azimuthal direction. The phase of higher harmonic modes are locked to that of the fundamental mode, so that the steep wave front is sustained for a long time compared to the typical time scale of the drift wave oscillation. The phase entrainment between the fundamental and second harmonic modes is studied, and the azimuthal structure of the stationary solution is found to be characterized by a parameter which is determined by the deviation of the fluctuations from the Boltzmann relation. There are two solutions of the azimuthal structures, which have steep wave front facing forward and backward in the wave propagation direction, respectively. The selection criterion of these solutions is derived theoretically from the stability of the phase entrainment. The simulation result and experimental observations are found to be consistent with the theoretical prediction.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [5] ;  [2] ;  [5] ;  [2]
  1. Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580 (Japan)
  2. (Japan)
  3. National Institute for Fusion Science, Toki 509-5292 (Japan)
  4. Teikyo University, Omuta 835-8580 (Japan)
  5. Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580 (Japan)
  6. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580 (Japan)
Publication Date:
OSTI Identifier:
22423778
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 3; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BIFURCATION; CYLINDRICAL CONFIGURATION; ENTRAINMENT; FLUCTUATIONS; MAGNETIZATION; OSCILLATIONS; PLASMA; THREE-DIMENSIONAL CALCULATIONS; WAVE PROPAGATION