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  Magnetic topology of a candidate NCSX plasma boundary configuration

Koniges, A. E., Grossman, A., Fenstermacher, M., Kisslinger, J., Mioduszewski, P., Rognlien, T., et al. (2003). Magnetic topology of a candidate NCSX plasma boundary configuration. Nuclear Fusion, 43, 107-118. doi:10.1088/0029-5515/43/2/304.

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Koniges, A. E.1, Author
Grossman, A.1, Author
Fenstermacher, M.1, Author
Kisslinger, J.2, Author              
Mioduszewski, P.1, Author
Rognlien, T.3, Author
Strumberger, E.4, 5, Author              
Umansky, M.1, Author
Affiliations:
1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA; University of California, San Diego, La Jolla, CA, USA; Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, ou_persistent22              
2Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
3Max Planck Society, ou_persistent13              
4Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
5Relativistic Plasmas, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856330              

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 Abstract: A candidate magnetic topology of the plasma boundary of the proposed compact stellarator national compact stellarator experiment (NCSX) is investigated using field-line tracing with diffusion. The required magnetic fields are obtained from a free-boundary equilibrium using the magnetic fields from external coils and bootstrap plasma currents inside the last closed magnetic surface (LCMS). These results are used to calculate the magnetic fields of the finite beta equilibria inside and outside the LCMS in a form suitable for field-line tracing. Poincaré plots of field lines that diffuse outwards from starting points just inside the LCMS indicate an ergodic divertor region. Intersections of field lines with a simple limiting surface show contained patches suitable for divertor control. Undesirable regions of sharply inclined angle of intersection with the limiting surface are localized, indicating the suitability of the configuration for optimized divertor design techniques. We also discuss physics implications of field-line lengths in the divertor region.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Rev. Type: Peer
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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Publ. Info: Copyright © Institute of Physics and IOP Publishing Limited 2003
Pages: - Volume / Issue: 43 Sequence Number: - Start / End Page: 107 - 118 Identifier: -