Rapidly-convergent flux-surface shape parameterization. (20th November 2020)

• Record Type: Journal Article
• Authors: Arbon, R; Candy, J; Belli, E A
• Is Part Of: Plasma physics and controlled fusion. Volume 63:Number 1(2021)
• Publication Date: 2020-11-20
• Subjects: MHD -- neoclassical -- gyrokinetic -- equilibrium; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/abc63b
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: 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.