Relationship Between Onset Thresholds, Trigger Types, and Rotation Shear for the m/n=2/1 Neoclassical Tearing Mode in a High-β Spherical Torus

Gerhardt, S. P. ; Brennan, D. P. ; Buttery, R. ; La Haye, R. J. ; Sabbagh, S. ; Strait, E. ; Bell, M. ; Bell, R. ; Fredrickson, E. ; Gates, D. ; LeBlanc, B. ; Menard, J. ; Stutman, D. ; Tritz, K. ; Yuh, H.

Princeton University. Plasma Physics Laboratory.

关键词: Shear Spherical Torus;    70 Plasma Physics And Fusion Technology;    Mhd;    Spherical Torus;    Edge Localized Modes;   

RP-ID  :  PPPL-4386
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  950773

美国|英语

来源: UNT Digital Library

【 摘 要 】

The onset conditions for the m/n=2/1 neoclassical tearing mode (NTM) are studied in terms of neoclassical drive, triggering instabilities, and toroidal rotation or rotation shear, in the spherical torus NSTX [M. Ono, et al., Nuclear Fusion 40, 557 (2000)]. There are three typical onset conditions for these modes, given in order of increasing neoclassical drive required for mode onset: triggering by energetic particle modes, triggering by edge localized modes, and cases where the modes appear to grow without a trigger. In all cases, the required drive increases with toroidal rotation shear, implying a stabilizing effect from the shear.