Computational modeling of neoclassical and resistive MHD tearing modes in tokamaks

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Numerical studies of the nonlinear evolution of MHD-type tearing modes in three-dimensional toroidal geometry with neoclassical effects are presented. The inclusion of neoclassical physics introduces an additional free-energy source for the nonlinear formation of magnetic islands through the effects of a bootstrap current in Ohm`s law. The neoclassical tearing mode is demonstrated to be destabilized in plasmas which are otherwise {Delta}` stable, albeit once an island width threshold is exceeded. The plasma pressure dynamics and neoclassical tearing growth is shown to be sensitive to the choice of the ratio of the parallel to perpendicular diffusivity ({Chi}{parallel}/{Chi}{perpendicular}). The study is completed ... continued below

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43 p.

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Gianakon, T.A.; Hegna, C.C. & Callen, J.D. June 24, 1996.

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Description

Numerical studies of the nonlinear evolution of MHD-type tearing modes in three-dimensional toroidal geometry with neoclassical effects are presented. The inclusion of neoclassical physics introduces an additional free-energy source for the nonlinear formation of magnetic islands through the effects of a bootstrap current in Ohm`s law. The neoclassical tearing mode is demonstrated to be destabilized in plasmas which are otherwise {Delta}` stable, albeit once an island width threshold is exceeded. The plasma pressure dynamics and neoclassical tearing growth is shown to be sensitive to the choice of the ratio of the parallel to perpendicular diffusivity ({Chi}{parallel}/{Chi}{perpendicular}). The study is completed with a demonstration and theoretical comparison of the threshold for single helicity neoclassical MHD tearing modes, which is described based on parameter scans of the local pressure gradient, the ratio of perpendicular to parallel pressure diffusivities {Chi}{perpendicular}/{Chi}{parallel}, and the magnitude of an initial seed magnetic perturbation.

Physical Description

43 p.

Notes

INIS; OSTI as DE96015002

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  • Other Information: PBD: 24 Jun 1996

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  • Other: DE96015002
  • Report No.: UW-CPTC--96-4
  • Grant Number: FG02-86ER53218
  • DOI: 10.2172/369660 | External Link
  • Office of Scientific & Technical Information Report Number: 369660
  • Archival Resource Key: ark:/67531/metadc688541

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  • June 24, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 30, 2015, 6:39 p.m.

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Gianakon, T.A.; Hegna, C.C. & Callen, J.D. Computational modeling of neoclassical and resistive MHD tearing modes in tokamaks, report, June 24, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc688541/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.