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Abstract

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 betaN 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 betaN and beta are defined in terms of the vacuum toroidal field.

Additional information

Authors: MILLER R L ET AL, General Atomics, San Diego (US);PEARLSTEIN L D, Lawrence Livermore National Laboratory, Livermore (US);SAUTER O ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas (1996) pp. 59-71
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