The convergence of analytic high-β equilibrium in a finite aspect ratio tokamak

Neches, R. Y.; Cowley, S. C.; Gourdain, P. A.; Leboeuf, J. N.
December 2008
Physics of Plasmas;Dec2008, Vol. 15 Issue 12, p122504
Academic Journal
The characteristics of near-unity-β equilibria are investigated with two codes. CUBE is a multigrid Grad–Shafranov solver [Gourdain et al., J. Comput. Phys. 216, 275 (2006)], and Ophidian was written to compute solutions using analytic unity-β equilibria [Cowley et al., Phys. Fluids B 3, 2066 (1991)]. Results from each method are qualitatively and quantitatively compared across a spectrum of mutually relevant parameters. These comparisons corroborate the theoretical results and provide benchmarks for high-resolution numerical results available from CUBE. Both tools facilitate the exploration of the properties of high-β equilibria, such as a highly diamagnetic plasma and its ramifications for stability and transport.


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