Range of chaotic state in the Josephson junction driven by a pulse train signal

The parameter dependence of the onset of chaos which appears as the devil's staircase on the current-voltage curve in the Josephson junction driven by a pulse train signal is studied based on an analog circuit simulation. In this study, hysteresis parameter beta and reduced frequency Omega are regar ded as significant. It is suggested that in the view point of these paramet er dependencies there is no remarkable difference in the range of chaotic s tate in the junction if compared to a monochromatic-signal-driven junction, meaning that the operation above the junction plasma frequency is desirabl e to avoid the chaos. The rf-amplitude dependence of the onset of chaos is also roughly surveyed.