Annular Josephson tunnel junctions in an external magnetic field: The dynamics

We have investigated the dynamical states in annular Josephson tunnel junctions in the presence of an externally applied uniform magnetic field parallel to the barrier plane. For electrically small and overdamped junctions we show that the Kulik perturbative theory for the Fiske singularities can easily and successfully be extended to the annular geometry even in the case of trapped fluxons. For electrically long annular junctions we present the results of the numerical simulations. Further, we report on the magnetic-field dependence of the amplitude of the so-called Fiske steps in specially designed high dissipation Nb/Al-AlOx-Al/Nb annular junctions having different normalized circumferences.