Properties of High Beta, Quasi-Axisymmetric NCSX Stellarator Configurations

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Quasi-axisymmetry, external kinks and ballooning stability are studied with respect to the plasma shaping and variation in the pressure and current profiles for NCSX. We show that while the kink stability may require a delicate boundary shaping, most quasi-axisymmetry may be achieved using a few low order modes that eliminate the large mirror fields arising partly from boundary shaping for the kink stability. In addition, we demonstrate that the kink and ballooning instability may be improved in the NCSX configurations by a more peaked pressure profile or a broader current profile. Finally, we show numerically that it is possible to ... continued below

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13 p.

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Boozer, A.; Fu, G.Y.; Ku, L.P.; Monticello, D. & Reiman, A. September 28, 1999.

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Quasi-axisymmetry, external kinks and ballooning stability are studied with respect to the plasma shaping and variation in the pressure and current profiles for NCSX. We show that while the kink stability may require a delicate boundary shaping, most quasi-axisymmetry may be achieved using a few low order modes that eliminate the large mirror fields arising partly from boundary shaping for the kink stability. In addition, we demonstrate that the kink and ballooning instability may be improved in the NCSX configurations by a more peaked pressure profile or a broader current profile. Finally, we show numerically that it is possible to construct a quasi-axisymmetric configuration that is stable to the external kink at all current levels for which the edge rotational transform is less than 0.5.

Physical Description

13 p.

Notes

INIS; OSTI as DE00012130

Medium: P; Size: 13 pages

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  • 12th International Stellarator Workshop, Madison, WI (US), 09/27/1999--10/01/1999

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  • Report No.: Cfpaper-4056
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 12130
  • Archival Resource Key: ark:/67531/metadc624622

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Office of Scientific & Technical Information Technical Reports

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  • September 28, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 1:12 p.m.

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Boozer, A.; Fu, G.Y.; Ku, L.P.; Monticello, D. & Reiman, A. Properties of High Beta, Quasi-Axisymmetric NCSX Stellarator Configurations, article, September 28, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc624622/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.