  Optimal two-dimensional (2D), three-dimensional (3D) wave launching
configurations are proposed for enhanced acceleration of charged particles in
magnetized plasmas. A primary wave is launched obliquely with respect to the
magnetic field and a secondary, low amplitude, wave is launched
perpendicularly. The effect of both the launching angle of the primary wave,
and the presence of the secondary wave is investigated. Theoretical predictions
of the highest performances of the three-dimensional (3D) configurations are
proposed using a Resonance Moments Method (RMM) based on estimates for the
moments of the velocity distribution function calculated inside the resonance
layers (RL). They suggest the existence of an optimal angle corresponding to
non parallel launching. Direct statistical simulations show that it is possible
to rise the mean electron velocity up to the order of magnitude as compared to
the primary wave launching alone. It is a quite promising result because the
amplitude of the secondary wave is ten times lower the one of the first wave.
The parameters used are related to magnetic plasma fusion experiments in
electron cyclotron resonance heating and electron acceleration in planetary
ionospheres and magnetospheres.
