Tearing modes in a plasma with magnetic braiding

Details Tearing modes in a plasma with magnetic braiding Tearing modes in a plasma with magnetic braiding

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phrvl..43.1398k&link_type=abstract

Physical Review Letters, vol. 43, Nov. 5, 1979, p. 1398-1401.

Physics

Plasma Physics

52

Magnetic Field Configurations, Magnetohydrodynamic Stability, Plasma Control, Tokamak Devices, Viscous Flow, Control Stability, Electron Plasma, Electron Runaway (Plasma Physics), Energy Technology, Linear Equations, Modal Response, Nonlinear Equations

Scientific paper

Linear and nonlinear properties of macroscopic tearing modes driven by anomalous electron viscosity effects associated with the braiding of magnetic field lines in a tokamak plasma are examined. It is shown that in the linear case, tearing modes with m=1 have a growth rate which is proportional to the fifth root of the ratio between the hydrodynamic and viscous decay times, while in the nonlinear case for m greater than or equal to 2 the width of the instability scales as the cube root of the time. Implications for the growth times of viscosity-driven tearing modes relative to resistive modes and the development of disruptive instabilities in tokamak plasmas are considered.

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