DYNAMICS OF 3 COUPLED LONG JOSEPHSON-JUNCTIONS

The dynamics of a system of three long Josephson transmission lines co upled at a common end point is investigated. We report several periodi c fluxon states and trace out the corresponding zero field steps. The boundary conditions at the common point lead to a very different stabi lity of steps for odd and even numbers of fluxons. In addition we find two ''normal state'' branches for the IV curve, where either two or t hree of the branches are in their normal state.