Authors
K Gustafson, P Ricci, A Bovet, I Furno, A Fasoli
Publication date
2012/6/1
Journal
Physics of Plasmas
Volume
19
Issue
6
Publisher
AIP Publishing
Description
Inspired by suprathermal ion experiments in the basic plasma experiment TORPEX, the transport of suprathermal ions in ideal interchange mode turbulence is theoretically examined in the simple magnetized torus configuration. We follow ion tracer trajectories as specified by ideal interchange mode turbulence imported from a numerical simulation of drift-reduced Braginskii equations. Using the variance of displacements, σ 2 (t)∼ t γ⁠, we find that γ depends strongly on suprathermal ion injection energy and the relative magnitude of turbulent fluctuations. The value of γ also changes significantly as a function of time after injection, through three distinguishable phases: ballistic, interaction, and asymmetric. During the interaction phase, we find the remarkable presence of three regimes of dispersion: superdiffusive, diffusive, and subdiffusive, depending on the energy of the suprathermal ions and the amplitude of the …
Total citations
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Scholar articles
K Gustafson, P Ricci, A Bovet, I Furno, A Fasoli - Physics of Plasmas, 2012