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

McKinney, I. J.; Pueschel, M. J.; Faber, B. J.; Hegna, C. C.; Talmadge, J. N.; Anderson, D. T.; Mynick, H. E.; Xanthopoulos, P.

doi:10.1017/s0022377819000588

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

Journal Article · 19 September 2019 · Journal of Plasma Physics

DOI: https://doi.org/10.1017/s0022377819000588 · OSTI ID:1656804

^[1]; Pueschel, M. J. ^[2];

^[1]; Hegna, C. C. ^[1]; Talmadge, J. N. ^[1]; Anderson, D. T. ^[1]; Mynick, H. E. ^[3]; Xanthopoulos, P. ^[4]

University of Wisconsin-Madison, WI (United States)
University of Texas, Austin, TX (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)

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.

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Research Organization:: University of Wisconsin-Madison, WI (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

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

OSTI ID:: 1656804

Alternate ID(s):: OSTI ID: 1606344; OSTI ID: 1668080

Journal Information:: Journal of Plasma Physics, Vol. 85, Issue 5; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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

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