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Physical Properties of Plasma Ion Dynamics in Various Equilibria of Field-Reversed Configuration

Single particle orbits are traced in the prescribed equilibria inside the separatrix of Field-Reversed Configurations (FRCs). Equilibria inside the separatrix with the peaked, flat and hollow current profile are calculated semi-analytically. The surface of section plot is used to visualize the regular and stochastic ion motion. In particular, stochasticity in a kinetic ion (i.e., the large gyro-radius ion) and magnetohydrodynamic (MHD) ion (i.e., the small gyro-radius ion) motion is studied; the majority of the kinetic ions are found to exhibit an adiabatic motion. It appears that the azimuthal drift velocity for the stochastic and kinetic ions in the elliptic FRC is larger than for the adiabatic ions because of a curvature drift in the neighborhood of the midplane. In the racetrack FRC, on the other hand, no significant difference is observed in the drift velocity in spite of the stochastic motion.