Fast growing double tearing modes in a tokamak plasma

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dc.creatorBierwage, Andreas
dc.creatorBenkadda, Sadruddin
dc.creatorHamaguchi, Satoshi
dc.creatorWakatani, Masahiro
dc.date2005-03-09
dc.date2005-11-14
dc.date.accessioned2026-07-07T06:40:34Z
dc.date.available2026-07-07T06:40:34Z
dc.descriptionConfigurations 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.
dc.description11 pages, 15 figures
dc.identifierhttps://arxiv.org/abs/physics/0503068
dc.identifierhttp://arxiv.org/abs/physics/0503068
dc.identifierPhys. Plasmas 12, 082504 (2005)
dc.identifierdoi:10.1063/1.1989727
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/101425
dc.subjectPlasma Physics
dc.titleFast growing double tearing modes in a tokamak plasma
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