A mechanism for tearing onset near ideal stability boundaries
作者： D. P. Brennan , R. J. La Haye , A. D. Turnbull , M. S. Chu , T. H. Jensen
DOI: 10.1063/1.1555830
关键词: Magnetohydrodynamic drive 、 Mechanics 、 Tearing 、 Tokamak 、 Physics 、 Discontinuity (linguistics) 、 Phase (waves) 、 Sawtooth wave 、 Nimrod 、 Nonlinear system 、 Statistical physics 、 Condensed matter physics
摘要: The prevention of neoclassical tearing modes (NTMs) in tokamak plasmas is a major challenge for fusion. Ideal can seed NTMs through forced reconnection, yet sawtoothing discharges it not well understood why particular sawtooth crash seeds NTM after several preceding sawteeth did not. Also, sometimes appear and grow without an obvious ideal mode causing island. Based on theoretical experimental results new mechanism onset proposed tested which explains these puzzling observations. Tearing stability calculations based equilibria from the DIII-D [J. L. Luxon G. Davis, Fusion Technol. 8, 441 (1985)] indicate that be driven unstable by rapid increase linear index Δ′ just before onset. Near kink limit βN≡β/(I/aBT), becomes large positive as approaches pole discontinuity. relative time scales change vs effects finite island width will determine evolution island, eventual nonlinear state. Theoretical predictions point, βN at specified small width, early characteristics are compared with experiments designed specifically to test this hypothesis. Time integration equation shows consistent 3D resistive magnetohydrodynamic code NIMROD [A. H. Glasser et al., Plasma Phys. Control. 41, A747 (1999)] used evolve reconstructed provide more comprehensive prediction during phase. simulations also mechanism.
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