A comparison of turbulent transport in&nbsp;a&nbsp;quasi-helical and a quasi-axisymmetric&nbsp;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

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

Journal Article · Thu Sep 19 00:00:00 EDT 2019 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377819000588· OSTI ID:1606344

^[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]

Univ. of Wisconsin, Madison, WI (United States)
Univ. of Texas, Austin, TX (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max-Planck-Inst. 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. Furthermore, 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.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC02-05CH11231; FG02-04ER54742; FG02-93ER54222; FG02-99ER54546

OSTI ID:: 1606344

Alternate ID(s):: OSTI ID: 1656804
OSTI ID: 1668080

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

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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