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research article

Suprathermal ion transport in simple magnetized torus configurations

Gustafson, K.
•
Ricci, P.
•
Bovet, A.
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2012
Physics of Plasmas

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, sigma(2)(t) similar to t(gamma), we find that c depends strongly on suprathermal ion injection energy and the relative magnitude of turbulent fluctuations. The value of gamma 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 turbulent fluctuations. We contrast these results with those from a "slab" magnetic geometry in which subdiffusion does not occur during the interaction phase. Initial results from TORPEX are consistent with data from a new synthetic diagnostic used to interpret our simulation results. The simplicity of the simple magnetized torus makes the present work of interest to analyses of more complicated contexts ranging from fusion devices to astrophysics and space plasma physics. [http://dx.doi.org/10.1063/1.4725420]

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Type
research article
DOI
10.1063/1.4725420
Web of Science ID

WOS:000305835100020

Author(s)
Gustafson, K.
Ricci, P.
Bovet, A.
Furno, I.
Fasoli, A.
Date Issued

2012

Publisher

American Institute of Physics

Published in
Physics of Plasmas
Volume

19

Issue

6

Article Number

062306

Subjects

CRPP_EDGE

•

TORPEX

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
June 28, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/82424
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