IV curves of long annular Josephson junctions

IV curves of long annular Josephson junctions (circumference much larger than the Josephson penetration depth) have been investigated numerically. It is concluded that an experiment on such a system is preferable to the usual linear geometries and will allow a study both of the undisturbed motion of a fluxon, and the fluxon-antifluxon collision process. The simulations show that the fluxon-antifluxon collisions generate long wavelength plasma oscillations which may give rise to fine structure in the IV curves.