Tearing mode analysis in tokamaks, revisited

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A new {Delta}{prime} shooting code has been developed to investigate tokamak plasma tearing mode stability in a cylinder and large aspect ratio ({epsilon} {le} 0.25) toroidal geometries, neglecting toroidal mode coupling. A different computational algorithm is used (shooting out from the singular surface instead of into it) to resolve the strong singularities at the mode rational surface, particularly in the presence of finite pressure term. Numerical results compare favorably with Furth et al. results. The effects of finite pressure, which are shown to decrease {Delta}{prime}, are discussed. It is shown that the distortion of the flux surfaces by the Shafranov ... continued below

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Medium: P; Size: 30 p.

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Nishimura, Y.; Callen, J.D. & Hegna, C.C. December 1, 1997.

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Description

A new {Delta}{prime} shooting code has been developed to investigate tokamak plasma tearing mode stability in a cylinder and large aspect ratio ({epsilon} {le} 0.25) toroidal geometries, neglecting toroidal mode coupling. A different computational algorithm is used (shooting out from the singular surface instead of into it) to resolve the strong singularities at the mode rational surface, particularly in the presence of finite pressure term. Numerical results compare favorably with Furth et al. results. The effects of finite pressure, which are shown to decrease {Delta}{prime}, are discussed. It is shown that the distortion of the flux surfaces by the Shafranov shift, which modifies the geometry metric element stabilizes the tearing mode significantly, even in a low {beta} regime before the toroidal magnetic curvature effects come into play. Double tearing modes in toroidal geometries are examined as well. Furthermore, m {ge} 2 tearing mode stability criteria are compared with three dimensional initial value MHD simulation by the FAR code.

Physical Description

Medium: P; Size: 30 p.

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INIS; OSTI as DE98003891

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  • Other Information: PBD: Dec 1997

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  • Other: DE98003891
  • Report No.: UW-CPTC--97-21
  • Grant Number: FG02-86ER53218
  • DOI: 10.2172/656700 | External Link
  • Office of Scientific & Technical Information Report Number: 656700
  • Archival Resource Key: ark:/67531/metadc707744

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  • December 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 5, 2015, 4:13 p.m.

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Nishimura, Y.; Callen, J.D. & Hegna, C.C. Tearing mode analysis in tokamaks, revisited, report, December 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc707744/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.