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Reduction of chaotic particle transport driven by drift waves in sheared flows

Phys. Plasmas 15, 112304 (2008); doi:10.1063/1.3009532

Published 7 November 2008

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F. A. Marcus,1 I. L. Caldas,1 Z. O. Guimarães-Filho,1 P. J. Morrison,2 W. Horton,2 Yu. K. Kuznetsov,1 and I. C. Nascimento1
1Institute of Physics, University of São Paulo, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil
2Department of Physics and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
Investigations of chaotic particle transport by drift waves propagating in the edge plasma of tokamaks with poloidal zonal flow are described. For large aspect ratio tokamaks, the influence of radial electric field profiles on convective cells and transport barriers, created by the nonlinear interaction between the poloidal flow and resonant waves, is investigated. For equilibria with edge shear flow, particle transport is seen to be reduced when the electric field shear is reversed. The transport reduction is attributed to the robust invariant tori that occur in nontwist Hamiltonian systems. This mechanism is proposed as an explanation for the transport reduction in Tokamak Chauffage Alfvén Brésilien [R. M. O. Galvão et al., Plasma Phys. Controlled Fusion 43, 1181 (2001)] for discharges with a biased electrode at the plasma edge. ©2008 American Institute of Physics
History: Received 2 June 2008; accepted 9 October 2008; published 7 November 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/112304/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.25.Fi
    Plasma transport properties
  • 52.35.Kt
    Plasma drift waves
  • 52.30.-q
    Plasma dynamics and flow
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • 52.55.Fa
    Tokamaks
  • YEAR: 2008

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ISSN:
1070-664X (print)   1089-7674 (online)
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