452 research outputs found
Lower hybrid oscillating two-stream instability in a plasma with magnetic shear
Magnetic shear is found to have a strong effect on the propagation characteristics of the lower hybrid parametric daughter waves but no significant effect on the pump wave. The analysis of the OTS instability shows that the convective damping introduced by magnetic shear acts on a distance L H(me/mi)½, where H is the magnetic shear scale length. There are two regimes for the convective damping, depending on the wavelength of the parametric daughter waves. For small wavelengths the growth rates are linear functions of (kL)-1. For large wavelengths the growth rates are exponentially decreasing functions of (kL)-
Dual equilibrium in a finite aspect ratio tokamak
A new approach to high pressure magnetically-confined plasmas is necessary to
design efficient fusion devices. This paper presents an equilibrium combining
two solutions of the Grad-Shafranov equation, which describes the
magnetohydrodynamic equilibrium in toroidal geometry. The outer equilibrium is
paramagnetic and confines the inner equilibrium, whose strong diamagnetism
permits to balance large pressure gradients. The existence of both equilibria
in the same volume yields a dual equilibrium structure. Their combination also
improves free-boundary mode stability
Carrier Storage in Ge Nanocrystals Grown on Silicon Oxide by a Two Step Dewetting / Nucleation Process
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