dorsal/arxiv
View SchemaNonlinear Evolution of q=1 Triple Tearing Modes in a Tokamak Plasma
| Authors | Andreas Bierwage, Satoshi Hamaguchi, Masahiro Wakatani, Sadruddin Benkadda, Xavier Leoncini |
|---|---|
| Categories | |
| ArXiv ID | physics/0412046 |
| URL | https://arxiv.org/abs/physics/0412046 |
| DOI | 10.1103/PhysRevLett.94.065001 |
| Journal | Phys. Rev. Lett. 94 (6), 065001 (2005) |
Abstract
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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"abstract": "In magnetic configurations with two or three q=1 (with q being the safety\nfactor) resonant surfaces in a tokamak plasma, resistive magnetohydrodynamic\nmodes with poloidal mode numbers m much larger than 1 are found to be linearly\nunstable. It is found that these high-m double or triple tearing modes\nsignificantly enhance through nonlinear interactions, the growth of the m=1\nmode. This may account for the sudden onset of the internal resistive kink,\ni.e., the fast sawtooth trigger. Based on the subsequent reconnection dynamics\nthat can proceed without formation of the m=1 islands, it is proposed that\nhigh-m triple tearing modes are a possible mechanism for precursor-free partial\ncollapses during sawtooth oscillations.",
"arxiv_id": "physics/0412046",
"authors": [
"Andreas Bierwage",
"Satoshi Hamaguchi",
"Masahiro Wakatani",
"Sadruddin Benkadda",
"Xavier Leoncini"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1103/PhysRevLett.94.065001",
"journal_ref": "Phys. Rev. Lett. 94 (6), 065001 (2005)",
"title": "Nonlinear Evolution of q=1 Triple Tearing Modes in a Tokamak Plasma",
"url": "https://arxiv.org/abs/physics/0412046"
},
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