Magnetic island structures and their rotation after pellet injection in FTU

E. Giovannozzi, S.V. Annibaldi, P. Buratti, D. Frigione, E. Lazzaro, L. Panaccione, O. Tudisco

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Abstract

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.
Original languageEnglish
Pages (from-to)226 - 231
Number of pages6
JournalNuclear Fusion
Volume44
Issue number2
DOIs
Publication statusPublished - Feb 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Giovannozzi, E., Annibaldi, S. V., Buratti, P., Frigione, D., Lazzaro, E., Panaccione, L., & Tudisco, O. (2004). Magnetic island structures and their rotation after pellet injection in FTU. Nuclear Fusion, 44(2), 226 - 231. https://doi.org/10.1088/0029-5515/44/2/002