Tearing-mode stability of tokamak plasmas with elliptical cross-section

Drift-tearing magnetic islands in tokamak plasmas

A systematic fluid theory of nonlinear magnetic island dynamics in conventional low, large aspect-ratio, circular cross-section tokamak plasmas is developed using an extended magnetohydrodynamics model that incorporates diamagnetic flows, ion gyroviscosity, fast parallel electron heat transport, the ion sound wave, the drift wave, and average magnetic field-line curvature. The model excludes th...

)ecember 1982 STABILIZATION OF THE TEARING MODE IN LOW DENSITY TOKAMAK PLASMAS BY TURBULENT ELECTRON DIFFUSION*

The effect of turbulent electron diffusion from stochastic electron orbits on the stability of low beta fluctuations is considered. A set of coupled self-adjoint equations is derived for the fluctuation potentials and A,,. For the tearing mode, it is shown that stability is obtained for sufficiently large values of the diffusion coefficient, Provided D, 1/n, this implies that a density threshol...

Exponentially growing tearing modes in Rijnhuizen Tokamak Project plasmas.

The local measurement of the island width w, around the resonant surface, allowed a direct test of the extended Rutherford model [P. H. Rutherford, PPPL Report-2277 (1985)], describing the evolution of radiation-induced tearing modes prior to disruptions of tokamak plasmas. It is found that this model accounts very well for the observed exponential growth and supports radiation losses as being ...

Hypersonic drift-tearing magnetic islands in tokamak plasmas

A two-fluid theory of long wavelength, hypersonic, drift-tearing magnetic islands in low-collisionality, lowplasmas possessing relatively weak magnetic shear is developed. The model assumes both slab geometry and cold ions, and neglects electron temperature and equilibrium current gradient effects. The problem is solved in three asymptotically matched regions. The “inner region” contains the is...

Supersonic drift-tearing magnetic islands in tokamak plasmas