Advancing the physics basis for quasi-helically symmetric stellarators

Bader, A.; Faber, B. J.; Schmitt, J. C.; Anderson, D. T.; Drevlak, M.; Duff, J. M.; Frerichs, H.; Hegna, C. C.; Kruger, T. G.; Landreman, M.; McKinney, I. J.; Singh, L.; Schroeder, J. M.; Terry, P. W.; Ware, A. S.

doi:10.1017/s0022377820000963

Title: Advancing the physics basis for quasi-helically symmetric stellarators

Journal Article · Thu Oct 01 00:00:00 EDT 2020 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377820000963· OSTI ID:1850066

;

; Anderson, D. T.; Drevlak, M.; Duff, J. M.;

; Hegna, C. C.;

;

; Schroeder, J. M.; Terry, P. W.; Ware, A. S.

A new optimized quasi-helically symmetric configuration is described that has the desirable properties of improved energetic particle confinement, reduced turbulent transport by three-dimensional shaping and non-resonant divertor capabilities. The configuration presented in this paper is explicitly optimized for quasi-helical symmetry, energetic particle confinement, neoclassical confinement and stability near the axis. Post optimization, the configuration was evaluated for its performance with regard to energetic particle transport, ideal magnetohydrodynamic stability at various values of plasma pressure and ion temperature gradient instability induced turbulent transport. The effects of discrete coils on various confinement figures of merit, including energetic particle confinement, are determined by generating single-filament coils for the configuration. Preliminary divertor analysis shows that coils can be created that do not interfere with expansion of the vessel volume near the regions of outgoing heat flux, thus demonstrating the possibility of operating a non-resonant divertor.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Oakland, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-93ER54222; FG02-99ER54546; AC02-05CH11231; SC0014664

OSTI ID:: 1850066

Journal Information:: Journal of Plasma Physics, Vol. 86, Issue 5; ISSN 0022-3778

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

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