New insights into MHD dynamics of magnetically confined plasmas from experiments in RFX

Martin, P; Martini, S; Antoni, V; Apolloni, L; Bagatin, M; Baker, W; Barana, O; Bartiromo, R; Bettini, P; Boboc, A; Bolzonella, T; Buffa, A; Canton, A; Cappello, S; Carraro, L; Cavazzana, R; Chitarin, G; Costa, S; D'Angelo, F; S Dal Bello,; De Lorenzi, Antonio; Desideri, D; F Escande, D; Fattorini, L; Fiorentin, P; Franz, P; Gaio, E; Garzotti, L; Giudicotti, L; Gnesotto, F; Grando, L; C Guo, S; Innocente, P; Intravaia, A; Lorenzini, R; Luchetta, A; Malesani, G; Manduchi, G; Marchiori, G; Marrelli, L; Martines, E; Maschio, A; Masiello, A; Milani, F; Moresco, M; Murari, A; Nielsen, P; O'Gorman, M; Ortolani, S; Paccagnella, R; Pasqualotto, R; Pégouriè, B; Peruzzo, S; Piovan, R; Pomaro, N; Ponno, A; Preti, G; E Puiatti, M; Rostagni, G; Sattin, F; Scarin, P; Serianni, G; Sonato, P; Spada, E; Spizzo, G; Spolaore, M; Taliercio, C; Telesca, G; Terranova, D; Toigo, V; Tramontin, L; Valisa, M; Vianello, N; Viterbo, M; Zabeo, L; Zaccaria, P; Zanca, P; Zaniol, B; Zanotto, L; Zilli, E; Zollino, G

The experimental and theoretical activity performed in the RFX experiment has allowed a deeper insight into the MHD properties of the RFP configuration. A set of successful experiments has demonstrated the possibility of influencing both the amplitude and the spectrum of the magnetic fluctuations which characterise the RFP configuration. A new regime (QSH states) where the dynamo mechanism works in a nearly laminar way and a helical core plasma is produced has been investigated. With these studies a reduction of the magnetic chaos has been obtained. The continuos rotation of wall locked resistive tearing modes has been obtained by an m = 0 rotating perturbation. This perturbation induces rotation of m = 1 non-linearly coupled modes.