Nonlinear Evolution of q=1 Triple Tearing Modes in a Tokamak Plasma

Details Nonlinear Evolution of q=1 Triple Tearing Modes in a Tokamak Plasma Nonlinear Evolution of q=1 Triple Tearing Modes in a Tokamak Plasma

2004-12-08

arxiv.org/abs/physics/0412046v2

Phys. Rev. Lett. 94 (6), 065001 (2005)

Physics

Plasma Physics

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.94.065001

In magnetic configurations with two or three q=1 (with q being the safety factor) resonant surfaces in a tokamak plasma, resistive magnetohydrodynamic modes with poloidal mode numbers m much larger than 1 are found to be linearly unstable. It is found that these high-m double or triple tearing modes significantly enhance through nonlinear interactions, the growth of the m=1 mode. This may account for the sudden onset of the internal resistive kink, i.e., the fast sawtooth trigger. Based on the subsequent reconnection dynamics that can proceed without formation of the m=1 islands, it is proposed that high-m triple tearing modes are a possible mechanism for precursor-free partial collapses during sawtooth oscillations.

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