Effect of ideal kink instabilities on particle redistribution

When an integrable model is used for the magnetic field lines in the sawtooth collapse most of the Ni ions remain close to the q=1 surface. Conversely, when modes of different helicities and sufficiently large amplitudes are included to produce stochasticity close to the q=1 surface, the Ni ions can reach the core. Simulations show that the electron temperature and the plasma density evolve in the same time scale. Do to their mass difference the electron motion is governed by the magnetic field while the ion motion is affected more by the electric force and the E x B drift. Due to Faraday's law both fields act on the same time scale and are controlled by the electrons. When the initial velocity is isotropic (zero average velocity) the saturated mode does not affect the W distribution. When the initial velocity of the W ions is close to the rotation velocity of the mode the W ions are expelled from the plasma core. In a future work a resistive kink will be used to model the Ni experiment. The associated island of the resistive kink can change the dynamics of Ni ions at q=1. Our preliminary results show that a realistic velocity distribution is necessary to obtain an accurate description of W dynamics.