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Title:
Stellarator microinstabilities and turbulence at low magnetic shear
Authors:
Faber, B. J.; Pueschel, M. J.; Terry, P. W.; Hegna, C. C.; Roman, J. E.
Affiliation:
AA(Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA), AB(Institute for Fusion Studies, University of Texas at Austin, Austin, TX 78712, USA), AC(Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA), AD(Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, USA), AE(D. Sistemes Informàtics i Computació, Universitat Politècnica de València, Camí de Vera, s/n E-46022 València, España)
Publication:
Journal of Plasma Physics, Volume 84, Issue 5, article id. 905840503, 28 pp.
Publication Date:
10/2018
Origin:
CUP
Keywords:
plasma instabilities, plasma nonlinear phenomena, plasma simulation
Abstract Copyright:
(c) 2018: © Cambridge University Press 2018
DOI:
10.1017/S0022377818001022
Bibliographic Code:
2018JPlPh..84e9003F

Abstract

Gyrokinetic simulations of drift waves in low-magnetic-shear stellarators reveal that simulation domains comprised of multiple turns can be required to properly resolve critical mode structures important in saturation dynamics. Marginally stable eigenmodes important in saturation of ion temperature gradient modes and trapped electron modes in the Helically Symmetric Experiment (HSX) stellarator are observed to have two scales, with the envelope scale determined by the properties of the local magnetic shear and an inner scale determined by the interplay between the local shear and magnetic field-line curvature. Properly resolving these modes removes spurious growth rates that arise for extended modes in zero-magnetic-shear approximations, enabling use of a zero-magnetic-shear technique with smaller simulation domains and attendant cost savings. Analysis of subdominant modes in trapped electron mode (TEM)-driven turbulence reveals that the extended marginally stable modes play an important role in the nonlinear dynamics, and suggests that the properties induced by low magnetic shear may be exploited to provide another route for turbulence saturation.
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