Stable bootstrap-current driven equilibria for low aspect ratio tokamaks

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Low aspect ratio tokamaks can potentially provide a high ratio of plasma pressure to magnetic pressure {beta} and high plasma current I at a modest size, ultimately leading to a high power density compact fusion power plant. For the concept to be economically feasible, bootstrap current must be a major component of the plasma current. A high value of the Troyon factor {beta}{sub N} and strong shaping are required to allow simultaneous operation at high {beta} and high bootstrap current fraction. Ideal magnetohydrodynamic stability of a range of equilibria at aspect ratio 1.4 is systematically explored by varying the pressure ... continued below

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17 p.

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Miller, R.L.; Lin-Liu, Y.R.; Turnbull, A.D.; Chan, V.S.; Pearlstein, L.D.; Sauter, O. et al. August 1, 1996.

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Low aspect ratio tokamaks can potentially provide a high ratio of plasma pressure to magnetic pressure {beta} and high plasma current I at a modest size, ultimately leading to a high power density compact fusion power plant. For the concept to be economically feasible, bootstrap current must be a major component of the plasma current. A high value of the Troyon factor {beta}{sub N} and strong shaping are required to allow simultaneous operation at high {beta} and high bootstrap current fraction. Ideal magnetohydrodynamic stability of a range of equilibria at aspect ratio 1.4 is systematically explored by varying the pressure profile and shape. The pressure and current profiles are constrained in such a way as to assure complete bootstrap current alignment. Both {beta}{sub N} and {beta} are defined in terms of the vacuum toroidal field. Equilibria with {beta}{sub N} {ge} 8 and {beta} - 35% to 55% exist which are stable to n = {infinity} ballooning modes, and stable to n = 0, 1,2,3 kink modes with a conducting wall. The dependence of {beta} and {beta}{sub N} with respect to aspect ratio is also considered.

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17 p.

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INIS; OSTI as DE96015185

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  • ISPP workshop on theory of fusion plasmas, Varenna (Italy), 26-31 Aug 1996

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  • Other: DE96015185
  • Report No.: GA--A22433
  • Report No.: CONF-9608156--1
  • Grant Number: FG03-95ER54309;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 390606
  • Archival Resource Key: ark:/67531/metadc682058

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:40 p.m.

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Miller, R.L.; Lin-Liu, Y.R.; Turnbull, A.D.; Chan, V.S.; Pearlstein, L.D.; Sauter, O. et al. Stable bootstrap-current driven equilibria for low aspect ratio tokamaks, article, August 1, 1996; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc682058/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.