Simulation of the time behaviour of impurities in JET Ar-seeded discharges and its relation with sawtoothing and RF heating

M. E. Puiatti, M. Valisa, M. Mattioli, T. Bolzonella, A. Bortolon, I. Coffey, R. Dux, M. Von Hellermann, P. Monier-Garbet, M. F.F. Nave, J. Ongena