Quantitative comparison of impurity transport in turbulence reduced and enhanced scenarios at Wendelstein 7-X

Alcusón, J. A.; Wegner, Th.; Dinklage, A.; Langenberg, A.; Bähner, J. -P.; Buttenschön, B.; Edlund, E. M.; Fuchert, G.; García-Regaña, J. M.; Grulke, O.; Huang, Z.; Porkolab, M.; Stechow, A. V.; Xanthopoulos, P.; Zocco, A.

doi:10.1088/1741-4326/aceb76

Quantitative comparison of impurity transport in turbulence reduced and enhanced scenarios at Wendelstein 7-X

Journal Article · Wed Aug 09 00:00:00 EDT 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aceb76· OSTI ID:2420334

^[1]; ^[2]; ^[2]; ^[2]; ^[3]; ^[2]; Edlund, E. M. ^[4]; Fuchert, G. ^[2]; ^[5]; Grulke, O. ^[6]; Huang, Z. ^[7]; Porkolab, M. ^[3]; Stechow, A. V. ^[2]; ^[2]; ^[2]

Max Planck Institute for Plasma Physics, Greifswald (Germany); University of Cordoba (Spain); OSTI
Max Planck Institute for Plasma Physics, Greifswald (Germany)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
State Univ. of New York (SUNY), Cortland, NY (United States)
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Laboratorio Nacional de Fusion
Max Planck Institute for Plasma Physics, Greifswald (Germany); Technical Univ. of Denmark, Lyngby (Denmark)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association

We assess the turbulent particle transport being responsible for the limitation of the confinement and, thus, the overall performance of the neoclassically optimized stellarator Wendelstein 7-X. The radial particle transport is experimentally inferred from the evaluation of impurity injection into turbulence reduced and enhanced plasma scenarios revealing a completely different confinement behavior. The impact of the density gradient on the turbulent ion transport is theoretically estimated using large-scale non-linear gyro-kinetic simulations enabling, for the first time in Wendelstein 7-X, a quantitative comparison to the experimentally assessed impurity transport properties. We demonstrate that impurity transport in most of the Wendelstein 7-X discharges, up to now impossible to cover only with neoclassical estimations, is dominated by turbulence and can be modelled via gyro-kinetic simulations.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: EUROfusion; USDOE Office of Science (SC)

Grant/Contract Number:: SC0014229

OSTI ID:: 2420334

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 63; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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