Nonlinear evolution of the internal kink mode in toroidal geometry for shaped tokamak plasmas
- 1 May 1988
- journal article
- research article
- Published by AIP Publishing in The Physics of Fluids
- Vol. 31 (5) , 1202-1216
Abstract
The nonlinear evolution of the internal kink mode is studied in toroidal geometry for noncircular cross‐section tokamak plasmas. The study is focused on very low‐shear and hollow q profiles, with q(ρ)≥1 for which the internal kink is unstable in the latter case, even at β=0. The nonlinear evolution is dominated by ideal magnetohydrodynamics (MHD), and the instability saturates, giving a quasihelical shift to the magnetic axis. The nonlinear saturation is caused by increased field line bending. Time scales of 103 τHp and axis shifts of 20% are reached when changes in q on the order of 3×10−3 from the marginal profile are produced.Keywords
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