Magnetic island structures and their rotation after pellet injection in FTU
| Autor: | E. Lazzaro, P. Buratti, D. Frigione, E. Giovannozzi, O. Tudisco, S. V. Annibaldi, L. Panaccione |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Nuclear fusion 44 (2004): 226–231. doi:10.1088/0029-5515/44/2/002 info:cnr-pdr/source/autori:Giovannozzi E; Annibaldi SV.; Buratti P.; Frigione D.; Lazzaro E.; Panaccione L.; Tudisco O./titolo:Magnetic island structures and their rotation after pellet injection in FTU/doi:10.1088%2F0029-5515%2F44%2F2%2F002/rivista:Nuclear fusion/anno:2004/pagina_da:226/pagina_a:231/intervallo_pagine:226–231/volume:44 |
| ISSN: | 1741-4326 0029-5515 |
| DOI: | 10.1088/0029-5515/44/2/002 |
| Popis: | Pellet injection gives rise to a rich variety of observations on m = 1 island dynamics. Pellet ablation near the q = 1 surface triggers fast growth of an island; as the island reaches a large amplitude, magnetic reconnection mixes the plasma centre with the q = 1 pellet fuelled region, so enhancing the effective pellet deposition depth. Long-lived m = 1 islands that coexist with sawtooth crashes are accompanied by higher harmonics (m/n = 1 with m > 1, where m is the poloidal mode number and n is the toroidal one) near the q = 1 surface; progressive phase shifts observed in the phase of such harmonics indicate island deformation by sheared viscous flow. Coupling between m = 1 and m = 2 islands is observed in sawtooth-free plasmas. Reconnection at the q = 2 surface is driven by a toroidal sideband of the m = 1 island; coupling is associated with strong braking of the m = 1 island. |
| Databáze: | OpenAIRE |
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