Journal
PLASMA PHYSICS AND CONTROLLED FUSION
Volume 63, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6587/abc63b
Keywords
MHD; neoclassical; gyrokinetic; equilibrium
Categories
Funding
- U.S. Department of Energy, Office of Science [DE-FC02-06ER54873, DE-FG0295ER54309, DESC0017992]
- agency of the United States Government
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The proposed novel flux-surface parameterization is suitable for strong-shaped flux surfaces and is based on a systematic expansion in shape parameters, offering an improvement to the Miller form and requiring only half the number of shape parameters as a general Fourier representation in the pedestal.
We propose a novel flux-surface parameterization suitable for local MHD equilibrium calculations with strongly-shaped flux surfaces. The method is based on a systematic expansion in a small number of intuitive shape parameters, and reduces to the well-known Miller D-shaped parameterization in the limit where some of the coefficients are set to zero. The new parameterization is valid for up-down asymmetric plasmas and provides an improvement to the Miller form. Simultaneously, the method is rapidly convergent and requires only about half the number of shape parameters as a general Fourier representation in the pedestal.
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