Singular surfaces in the open field line region of a diverted tokamak

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The structure of the open field lines of a slightly nonaxisymmetric, poloidally diverted tokamak is explored by numerical integration of the field line equations for a simple model field. In practice, the nonaxisymmetry could be produced self-consistently by the nonlinear evolution of a free-boundary MHD mode, or it could be produced by field errors, or it could be imposed externally by design. In the presence of a nonaxisymmetric perturbation, the tokamak is shown to develop open field line regions of differing topology separated by singular surfaces. It is argued that the singular surfaces can be expected to play a role ... continued below

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32 p.

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Reiman, A. May 1, 1995.

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Description

The structure of the open field lines of a slightly nonaxisymmetric, poloidally diverted tokamak is explored by numerical integration of the field line equations for a simple model field. In practice, the nonaxisymmetry could be produced self-consistently by the nonlinear evolution of a free-boundary MHD mode, or it could be produced by field errors, or it could be imposed externally by design. In the presence of a nonaxisymmetric perturbation, the tokamak is shown to develop open field line regions of differing topology separated by singular surfaces. It is argued that the singular surfaces can be expected to play a role analogous to that of rational toroidal flux surfaces, in terms of constraining ideal MHD perturbations and thus constraining the free-energy that can be tapped by ideal MHD instabilities. The possibility of active control of free-boundary instabilities by means of currents driven on the open singular surfaces, which are directly accessible from the divertor plates, is discussed. Also discussed is the possibility of early detection of imminent disruptions through localized measurement of the singular surface currents.

Physical Description

32 p.

Notes

INIS; OSTI as DE95011716

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  • Other Information: PBD: May 1995

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  • Other: DE95011716
  • Report No.: PPPL--3099
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/61211 | External Link
  • Office of Scientific & Technical Information Report Number: 61211
  • Archival Resource Key: ark:/67531/metadc690299

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 15, 2016, 7:10 p.m.

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Reiman, A. Singular surfaces in the open field line region of a diverted tokamak, report, May 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc690299/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.