The use of near-axis magnetic fields for stellarator turbulence simulations

Jorge, R.; Landreman, M.

doi:10.1088/1361-6587/abc862

The use of near-axis magnetic fields for stellarator turbulence simulations

Journal Article · 27 November 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/abc862· OSTI ID:1850061

^[1]; Landreman, M.

OSTI

Abstract

The design of turbulence optimized stellarators has so far relied on three-dimensional equilibrium codes such as VMEC in order to find the minimum of a given objective function. In this work, we propose a complimentary approach based on the near-axis expansion to compute the geometry parameters of neoclassicaly optimized stellarators used in turbulence studies. As shown here, the near-axis expansion can be a reasonable approximation of the geometric parameters relevant for turbulence and stability simulations of the core of existing optimized stellarator designs. In particular, we examine the geometry coefficients that appear in the gyrokinetic equation, the drift-reduced fluid equations and the ideal ballooning equation. This approach may allow for the development of new stellarator optimization techniques significantly faster than conventional methods.

Research Organization:: Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-93ER54197;

OSTI ID:: 1850061

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 63; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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