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The Von K{\'a}rm{\'a}n Sodium experiment yields a variety of dynamo regimes,when asymmetry is imparted to the flow by rotating impellers at different speedF1 and F2. We show that as the intensity of forcing, measured as F1 + F2, isincreased, the transition to a self-sustained magnetic field is always observedvia a supercritical bifurcation to a stationary state. For some values of theasymmetry parameter $\\theta$ = (F1--F2)/(F1+F2), time dependent dynamo regimesdevelop. They are observed either when the forcing is increased for a givenvalue of asymmetry, or when the amount of asymmetry is varied at sufficientlyhigh forcing. Two qualitatively different transitions between oscillatory andstationary regimes are reported, involving or not a strong divergence of theperiod of oscillations. These transitions can be interpreted using a lowdimensional model based on the interactions of two dynamo modes.

Dynamo regimes and transitions in the VKS experiment