Destabilization of low-n peeling modes by trapped energetic particles

The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode's dispersion relation derived from an energy principle. A resistive-wall peeli...

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Veröffentlicht in:Physics of plasmas 2013-06, Vol.20 (6)
Hauptverfasser: Hao, G. Z., Liu, Y. Q., Wang, A. K., Matsunaga, G., Okabayashi, M., Mou, Z. Z., Qiu, X. M.
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Sprache:eng
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Zusammenfassung:The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode's dispersion relation derived from an energy principle. A resistive-wall peeling mode with m/n=6/1, with m and n being the poloidal and toroidal mode numbers, respectively, is destabilized by trapped EPs as the EPs' pressure exceeds a critical value βc*, which is sensitive to the pitch angle of trapped EPs. The dependence of βc* on the particle pitch angle is eventually determined by the bounce average of the mode eigenfunction. Peeling modes with higher m and n numbers can also be destabilized by trapped EPs. Depending on the wall distance, either a resistive-wall peeling mode or an ideal-kink peeling mode can be destabilized by EPs.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4811382