Mode coupling trigger of neoclassical magnetohydrodynamic tearing modes in tokamaks

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Description

Numerical studies of the nonlinear evolution of coupled magnetohydrodynamic - 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}{prime} stable, albeit once a threshold island width is exceeded. A possible mechanism for exceeding or eliminating this threshold condition is demonstrated based on mode coupling due to toroidicity with a pre-existing instability at the q = ... continued below

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16 p.

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Gianakon, T.A.; Hegna, C.C. & Callen, J.D. May 1, 1997.

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Description

Numerical studies of the nonlinear evolution of coupled magnetohydrodynamic - 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}{prime} stable, albeit once a threshold island width is exceeded. A possible mechanism for exceeding or eliminating this threshold condition is demonstrated based on mode coupling due to toroidicity with a pre-existing instability at the q = 1 surface.

Physical Description

16 p.

Notes

INIS; OSTI as DE97007257

Medium: P; Size: 16 p.

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  • Other Information: PBD: May 1997

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  • Other: DE97007257
  • Report No.: UW-CPTC--97-6
  • Grant Number: FG02-86ER53218
  • DOI: 10.2172/501485 | External Link
  • Office of Scientific & Technical Information Report Number: 501485
  • Archival Resource Key: ark:/67531/metadc692060

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 10, 2017, 2:42 p.m.

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Gianakon, T.A.; Hegna, C.C. & Callen, J.D. Mode coupling trigger of neoclassical magnetohydrodynamic tearing modes in tokamaks, report, May 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc692060/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.