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Self-organized criticality revisited: non-local transport by turbulent amplification

Part of: Complex Plasma Phenomena

Published online by Cambridge University Press:  13 November 2015

A. V. Milovanov  and
J. J. Rasmussen
A. V. Milovanov*
Affiliation:
ENEA National Laboratory, Centro Ricerche Frascati, I-00044 Frascati, Rome, Italy Department of Space Plasma Physics, Space Research Institute, Russian Academy of Sciences, 117997 Moscow, Russia
J. J. Rasmussen
Affiliation:
Physics Department, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
*
†Email address for correspondence: alexander.milovanov@enea.it
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Abstract

We revise the applications of self-organized criticality (SOC) as a paradigmatic model for tokamak plasma turbulence. The work, presented here, is built around the idea that some systems do not develop a pure critical state associable with SOC, since their dynamical evolution involves as a competing key factor an inverse cascade of the energy in reciprocal space. Then relaxation of slowly increasing stresses will give rise to intermittent bursts of transport in real space and outstanding transport events beyond the range of applicability of the ‘conventional’ SOC. Also, we are concerned with the causes and origins of non-local transport in magnetized plasma, and show that this type of transport occurs naturally in self-consistent strong turbulence via a complexity coupling to the inverse cascade. We expect these coupling phenomena to occur in the parameter range of strong nonlinearity and time scale separation when the Rhines time in the system is small compared with the instability growth time.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 6 , December 2015 , 495810606
Copyright
© Cambridge University Press 2015 

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