Physics – Plasma Physics
Scientific paper
2004-12-08
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.
Benkadda Sadruddin
Bierwage Andreas
Hamaguchi Satoshi
Leoncini Xavier
Wakatani Masahiro
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