dorsal/arxiv
View SchemaFast growing double tearing modes in a tokamak plasma
| Authors | Andreas Bierwage, Sadruddin Benkadda, Satoshi Hamaguchi, Masahiro Wakatani |
|---|---|
| Categories | |
| ArXiv ID | physics/0503068 |
| URL | https://arxiv.org/abs/physics/0503068 |
| DOI | 10.1063/1.1989727 |
| Journal | Phys. Plasmas 12, 082504 (2005) |
Abstract
Configurations with nearby multiple resonant surfaces have broad spectra of linearly unstable coupled tearing modes with dominant high poloidal mode numbers m. This was recently shown for the case of multiple q = 1 resonances [Bierwage et al., Phys. Rev. Lett. 94 (6), 65001 (2005)]. In the present work, similar behavior is found for double tearing modes (DTM) on resonant surfaces with q >= 1. A detailed analysis of linear instability characteristics of DTMs with various mode numbers m is performed using numerical simulations. The mode structures and dispersion relations for linearly unstable modes are calculated. Comparisons between low- and higher-m modes are carried out, and the roles of the inter-resonance distance and of the magnetic Reynolds number S_Hp are investigated. High-m modes are found to be destabilized when the distance between the resonant surfaces is small. They dominate over low-m modes in a wide range of S_Hp, including regimes relevant for tokamak operation. These results may be readily applied to configurations with more than two resonant surfaces.
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"abstract": "Configurations with nearby multiple resonant surfaces have broad spectra of\nlinearly unstable coupled tearing modes with dominant high poloidal mode\nnumbers m. This was recently shown for the case of multiple q = 1 resonances\n[Bierwage et al., Phys. Rev. Lett. 94 (6), 65001 (2005)]. In the present work,\nsimilar behavior is found for double tearing modes (DTM) on resonant surfaces\nwith q \u003e= 1. A detailed analysis of linear instability characteristics of DTMs\nwith various mode numbers m is performed using numerical simulations. The mode\nstructures and dispersion relations for linearly unstable modes are calculated.\nComparisons between low- and higher-m modes are carried out, and the roles of\nthe inter-resonance distance and of the magnetic Reynolds number S_Hp are\ninvestigated. High-m modes are found to be destabilized when the distance\nbetween the resonant surfaces is small. They dominate over low-m modes in a\nwide range of S_Hp, including regimes relevant for tokamak operation. These\nresults may be readily applied to configurations with more than two resonant\nsurfaces.",
"arxiv_id": "physics/0503068",
"authors": [
"Andreas Bierwage",
"Sadruddin Benkadda",
"Satoshi Hamaguchi",
"Masahiro Wakatani"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1063/1.1989727",
"journal_ref": "Phys. Plasmas 12, 082504 (2005)",
"title": "Fast growing double tearing modes in a tokamak plasma",
"url": "https://arxiv.org/abs/physics/0503068"
},
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