منابع مشابه
Toroidal Momentum Confinement in Tokamaks
Theories for the toroidal momentum confinement in tokamaks have been developed. It is shown that the logarithmic gradient of the toroidal flow is a linear combination of logarithmic gradients of the plasma pressure and the temperature in neoclassical quasilinear theory. The fluctuation-induced toroidal stress consists of a diffusion flux, a convective flux, and a residual flux. The effects of a...
متن کاملEnergetic Particle Mode Dynamics in Tokamaks
Energetic Particle Modes [1] (EPM) are strongly driven oscillations excited via wave-particle resonant interactions at the characteristic frequencies of the energetic ions [1, 2], ωtE, ωBE and/or ωdE , i.e., respectively the transit frequency for circulating particles and the bounce and precessional drift frequencies for trapped ions. A sharp transition in the plasma stability at the critical E...
متن کاملEnergetic particle mode stability in tokamaks with hollow q-profiles
A thorough analysis of energetic particle modes ~EPM! stability and mode structures is presented for tokamaks with hollow q profiles. Focusing on the region near the minimum-q surface, EPM gap modes and resonant EPMs are shown to exist as solutions of the same dispersion relation. By controlling the fast ion distribution function, or, equivalently, their fundamental dynamical properties, a smoo...
متن کاملEffects of Alpha Particle Stopping-Power Models on Inertial Confinement Fusion Implosions
An important issue in the design of inertial confinement fusion (ICF) implosion experiments is calculating the proper energy-deposition rate of the alpha particles as they travel through the plasma. In this project, four different models of stopping power (energy deposition), based on different physics approximations, have been examined: the Skupsky model (currently used in Laboratory for Laser...
متن کامل1 7 N ov 2 00 4 Marginal Confinement in Tokamaks by Inductive Electric Field
Here diffusion and Ware pinch are analyzed as opposed effects for plasma confinement , when instabilities are not considered. In this work it is studied the equilibrium inductive electric field where both effects annul each other in the sense that the average normal velocity is zero, that is, marginal velocity confinement is reached. The critical electric field defined in that way is studied fo...
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ژورنال
عنوان ژورنال: Physics of Fluids B: Plasma Physics
سال: 1989
ISSN: 0899-8221
DOI: 10.1063/1.858986