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(EX/P4-11) Island Structure and Rotation after Pellet Injection in FTU

E. Giovannozzi1), S. Annibaldi2), P. Buratti1), D. Frigione1), E. Lazzaro3), L. Panaccione1), O. Tudisco1)
1) Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, Frascati, Italy
2) Burning Plasma Research Group, INFM and Politecnico di Torino, Italy.
3) Associazione EURATOM-ENEA-CNR sulla Fusione, IFP-CNR, Milano, Italy

Abstract.  Pellet injection with ablation near the q=1 surface triggers the fast growth of an island with dominant m=1 poloidal number. As the island reaches a large amplitude, magnetic reconnection mixes the plasma center with the q=1 pellet fuelled region, so enhancing the effective pellet deposition depth. Long-lived m=1 island show higher harmonics (m/n=1 with m>1) near the q=1 surface. Progressive phase shift observed in the phases is attributed to island deformation by sheared viscous flow. Coupling between m=1 and m=2 islands is observed. Reconnection at the q=2 surface is driven by a toroidal sideband of the m=1 island; coupling provokes strong braking of both islands.

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IAEA 2003