Trapping, anomalous transport and quasi-coherent structures in magnetically confined plasmas

Details Trapping, anomalous transport and quasi-coherent structures in magnetically confined plasmas Trapping, anomalous transport and quasi-coherent structures in magnetically confined plasmas

2009-03-12

arxiv.org/abs/0903.2223v1

Physics

Plasma Physics

Latex 14 pages including two EPS figures

Scientific paper

Strong electrostatic turbulence in magnetically confined plasmas is characterized by trapping or eddying of particle trajectories produced by the $E\times B$ stochastic drift. Trapping is shown to produce strong effects on test particles and on test modes. It determines non-standard statistics of trajectories: non-Gaussian distribution, memory effects and coherence. Trapped trajectories form quasi-coherent structure. Trajectory trapping has strong nonlinear effects on the test modes on turbulent plasmas. We determine the growth rate of drift modes as function of the statistical characteristics of the background turbulence. We show that trapping provides the physical mechanism for the inverse cascade observed in drift turbulence and for the zonal flow generation.

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