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Generic structure of externally driven tearing modes instabilities

  • E. Lazzaro
  • R. Coelho
Article

Abstract

A major limit to steady state and advanced high β p operation of tokamaks of reactor class is due to the onset of tearing modes that develop magnetic and may cause loss of energy confinement or a major disruption. Here the structure of a classical problem about the effects of external control helical fields is analysed and it is shown to offer a general paradigm of response of low order classical and neoclassical tearing modes to a wide class of external perturbations. New results of principle on the structural stability of the response model are obtained, leading to a clear interpretation of the role of “seed islands” in the onset of neo-classical tearing modes and the role of finite ion larmor radius corrections to Ohm’s law.

PACS

52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.) 52.25.Fi Transport properties 52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • E. Lazzaro
    • 1
  • R. Coelho
    • 2
  1. 1.Istituto di Fisica del Plasma “P.Caldirola”Consiglio Nazionale delle RicercheEuratom-ENEA-CNR AssociationMilanItaly
  2. 2.Associação EURATOM/ISTCentro de Fusão NuclearLisbon CodexPortugal

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