Normal mode master equation for the distribution of lower hybrid electromagnetic energy in tokamaks
The master equation for the poloidal spectrum of electromagnetic energy in a toroidal plasma is derived. This equation provides a theoretical framework for a global description of the propagation and absorption of lower hybrid waves (or any weakly damped small wavelength mode) in present day tokamaks. Resonant toroidal couplings between the unperturbed cylindrical modes are the basic processes involved in this description. They lead to the destruction of correlations above a stochasticity threshold for the toroidal perturbation. A general method for computing the coupling coefficients is proposed and applied under typical current generation conditions. This normal mode energy diffusion provides a simple theory to address the so-called "spectral gap" problem.
Bibliographic Reference: Report: EUR-CEA-FC-1363 EN (1989)
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 198910685 / Last updated on: 1994-12-01
Original language: en
Available languages: en