2018 Impact factor 1.660
Special Topics
Eur. Phys. J. Special Topics 164, 157-164 (2008)
DOI: 10.1140/epjst/e2008-00841-5

Evidence of low-dimensional chaos in magnetized plasma turbulence

T. Živković and K. Rypdal

Department of Physics and Technology, University of Tromsø, 9037 Tromsø, Norway

tatjana@phys.uit.no

Abstract
We analyze probe data obtained from a toroidal magnetized plasma configuration suitable for studies of low-frequency gradient-driven instabilities. These instabilities give rise to field-aligned convection rolls analogous to Rayleigh-Benard cells in neutral fluids, and may theoretically develop similar routes to chaos. When using mean-field dimension analysis, we observe low dimensionality, but this could originate from either low-dimensional chaos, periodicity or quasi-periodicity. Therefore, we apply recurrence plot analysis as well as estimation of the largest Lyapunov exponent. These analyses provide evidence of low-dimensional chaos, in agreement with theoretical predictions. Our results can be applied to other magnetized plasma configurations, where gradient-driven instabilities dominate the dynamics of the system.



© EDP Sciences, Springer-Verlag 2008