Reduction or Enhancement of Stellarator Turbulence by Impurities

García-Regaña, J. M.; Calvo, I.; Parra, F. I.; Thienpondt, H.

doi:10.1103/PhysRevLett.133.105101

Title: Reduction or Enhancement of Stellarator Turbulence by Impurities

Journal Article · 06 September 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.105101 · OSTI ID:2440064

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A systematic study of the impact of impurities on the turbulent heat fluxes is presented for the stellarator Wendelstein 7-X (W7-X) and, for comparison, the Large Helical Device and ITER. By means of nonlinear multispecies gyrokinetic simulations, it is shown that impurities, depending on the sign of their density gradient, can significantly enhance or reduce turbulent ion heat losses. For the relevant scenario of turbulence reduction, an optimal impurity concentration that minimizes the ion heat diffusivity emerges as a universal feature. This result demonstrates the potential of impurities for controlling turbulence and accessing enhanced confinement regimes in fusion plasmas and, in particular, in W7-X. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2440064

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 133; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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