Particle transport due to magnetic fluctuation in a field-reversed configuration

Effects of fluctuating magnetic field in a Field-Reversed Configuration (FRC) on cross-field particle transport have investigated with the aid of numerical calculation of single particle orbits. The canonical angular momentum of a plasma particle (Pθ=mνθr + qΨ, Ψ > 0 inside the separatrix) varies temporally in a fluctuating magnetic field used here, although it is a constant of motion in axisymmetric FRC. The calculation results show the ensemble averaged time derivative of the canonical angular momentum goes to zero, which suggests the guiding center of plasma particle does not suffer from a cross-field drift. The particle diffusion due to magnetic fluctuation, however, causes a radial flow in inhomogeneous FRC plasma. (author)