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Title: A comparison of turbulent transport in a quasi-helical and a quasi-axisymmetric stellarator

Abstract

Ion-temperature-gradient-driven (ITG) turbulence is compared for two quasi-symmetric (QS) stellarator configurations to determine the relationship between linear growth rates and nonlinear heat fluxes. We focus on the quasi-helically symmetric (QHS) stellarator HSX and the quasi-axisymmetric (QAS) stellarator NCSX. In normalized units, HSX exhibits higher growth rates than NCSX, while heat fluxes in gyro-Bohm units are lower in HSX. These results hold for simulations made with both adiabatic and kinetic electrons. The results show that HSX has a larger number of subdominant modes than NCSX and that eigenmodes are more spatially extended in HSX. We conclude that the consideration of nonlinear physics is necessary to accurately assess the heat flux due to ITG turbulence when comparing QS stellarator equilibria.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1];  [1];  [3];  [4]
  1. University of Wisconsin-Madison, WI (United States)
  2. University of Texas, Austin, TX (United States)
  3. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  4. Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)
Publication Date:
Research Org.:
University of Wisconsin-Madison, WI (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1656804
Alternate Identifier(s):
OSTI ID: 1668080
Grant/Contract Number:  
AC02-05CH11231; FG02-93ER54222; FG02-04ER54742; FG02-99ER54546; DE-FG02-93ER54222, No. DE-FG02-04ER54742, and No. DE-FG02-99ER54546, DE-AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Plasma Physics
Additional Journal Information:
Journal Volume: 85; Journal Issue: 5; Journal ID: ISSN 0022-3778
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Fusion plasma; plasma instabilities; plasma nonlinear phenomena

Citation Formats

McKinney, I. J., Pueschel, M. J., Faber, B. J., Hegna, C. C., Talmadge, J. N., Anderson, D. T., Mynick, H. E., and Xanthopoulos, P. A comparison of turbulent transport in a quasi-helical and a quasi-axisymmetric stellarator. United States: N. p., 2019. Web. doi:10.1017/s0022377819000588.
McKinney, I. J., Pueschel, M. J., Faber, B. J., Hegna, C. C., Talmadge, J. N., Anderson, D. T., Mynick, H. E., & Xanthopoulos, P. A comparison of turbulent transport in a quasi-helical and a quasi-axisymmetric stellarator. United States. doi:10.1017/s0022377819000588.
McKinney, I. J., Pueschel, M. J., Faber, B. J., Hegna, C. C., Talmadge, J. N., Anderson, D. T., Mynick, H. E., and Xanthopoulos, P. Thu . "A comparison of turbulent transport in a quasi-helical and a quasi-axisymmetric stellarator". United States. doi:10.1017/s0022377819000588. https://www.osti.gov/servlets/purl/1656804.
@article{osti_1656804,
title = {A comparison of turbulent transport in a quasi-helical and a quasi-axisymmetric stellarator},
author = {McKinney, I. J. and Pueschel, M. J. and Faber, B. J. and Hegna, C. C. and Talmadge, J. N. and Anderson, D. T. and Mynick, H. E. and Xanthopoulos, P.},
abstractNote = {Ion-temperature-gradient-driven (ITG) turbulence is compared for two quasi-symmetric (QS) stellarator configurations to determine the relationship between linear growth rates and nonlinear heat fluxes. We focus on the quasi-helically symmetric (QHS) stellarator HSX and the quasi-axisymmetric (QAS) stellarator NCSX. In normalized units, HSX exhibits higher growth rates than NCSX, while heat fluxes in gyro-Bohm units are lower in HSX. These results hold for simulations made with both adiabatic and kinetic electrons. The results show that HSX has a larger number of subdominant modes than NCSX and that eigenmodes are more spatially extended in HSX. We conclude that the consideration of nonlinear physics is necessary to accurately assess the heat flux due to ITG turbulence when comparing QS stellarator equilibria.},
doi = {10.1017/s0022377819000588},
journal = {Journal of Plasma Physics},
number = 5,
volume = 85,
place = {United States},
year = {2019},
month = {9}
}

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