Test Particles, Test Modes and Drift Turbulence
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Bucharest (Romania)
Strong electrostatic turbulence in magnetically confined plasmas is characterized by trapping or eddying of test particle trajectories produced by the ExB stochastic drift. Trapping is shown to produce non-standard statistics of trajectories: non-Gaussian distribution, memory effects and quasi-coherence. Two types of effects produced by trapping are analyzed. The first type concerns particle and energy transport and consists in very strong nonlinear modification of the diffusion coefficients. Anomalous diffusion regimes are obtained when the other components of the motion (particle collisions, plasma rotation, the motion along the confining magnetic field) do not destroy trajectory eddying. The second type of effects are evidenced by studying test modes on turbulent plasma. We show that trappyng provides the physical mechanism for the inverse cascade observed in drift turbulence.
- OSTI ID:
- 21251523
- Journal Information:
- AIP Conference Proceedings, Vol. 1061, Issue 1; Conference: 2008 ICTP international workshop on the frontiers of modern plasma physics, Trieste (Italy), 14-25 Jul 2008; Other Information: DOI: 10.1063/1.3013775; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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