Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phrvl..39.1540c&link_type=abstract
Physical Review Letters, vol. 39, Dec. 12, 1977, p. 1540-1543. ERDA-sponsored research.
Physics
83
Magnetohydrodynamic Turbulence, Plasma Dynamics, Tokamak Devices, Turbulence Effects, Drift Rate, Plasma Waves, Transport Properties
Scientific paper
Effects of magnetic turbulence in Tokamaks are investigated for the case of drift-wave-induced magnetic perturbations. It is found that such magnetic perturbations can change the magnetic topology of a Tokamak by forming thin high-order magnetic islands at rational surfaces and can also significantly enhance the radial electron heat flux. The magnetic islands formed by adding the (stochastic) radial component of a magnetic perturbation to the helical component of the equilibrium magnetic field near a rational surface are illustrated. The effects of the drift-wave magnetics on ions and electrons are shown to be quite different, inasmuch as ions are not aware of the magnetic-island structure in one drift-wave period but electrons are aware of the full magnetic-island structure. The resonant electron distribution function in the presence of magnetic islands is calculated from a drift-kinetic equation, the additional singular contribution to the perturbed electron distribution function due to the presence of drift-wave-induced magnetic islands is determined, and the induced particle-transport flux is computed from the velocity-space moment of the drift-kinetic equation.
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