Ion-temperature-gradient stability near the magnetic axis of quasisymmetric stellarators

Jorge, R.; Landreman, M.

doi:10.1088/1361-6587/abfdd4

Ion-temperature-gradient stability near the magnetic axis of quasisymmetric stellarators

Journal Article · 02 June 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/abfdd4· OSTI ID:1850062

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OSTI

Abstract

The stability of the ion-temperature gradient mode in quasisymmetric stellarators is assessed. This is performed using a set of analytical estimates together with linear gyrokinetic simulations. The peak growth rates, their corresponding real frequencies and wave-vectors are identified. A comparison is made between a first-order near-axis expansion model and eleven realistic designs obtained using numerical optimization methods. It is found that while the near-axis expansion is able to replicate the growth rates, real frequencies and perpendicular wave-vector at the inner core (both using simplified dispersion relations and first-principle gyrokinetic simulations), it leads to an overestimation of the growth rate at larger radii. An approximate analytic solution of the ITG dispersion relation for the non-resonant limit suggests growth rates could be systematically higher in quasi-axisymmetric (QA) configurations compared to quasi-helically (QH) symmetric ones. However except for very close to the axis, linear gyrokinetic simulations do not show systematic differences between QA and QH configurations.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-93ER54197;

OSTI ID:: 1850062

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 7 Vol. 63; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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