Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impurities

Dominski, J.; Maget, P.; Manas, P.; Morales, J.; Ku, S.; Scheinberg, A.; Chang, C. S.; Hager, R.; O’Mullane, M.

doi:10.1088/1741-4326/ad8c63

Title: Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impurities

Journal Article · 12 November 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad8c63 · OSTI ID:2477138

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
CEA, IRFM, Saint Paul Lez Durance (France)
Jubilee Development, Cambridge, MA (United States)
UK Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)

Tungsten peaking is predicted in the core of a WEST plasma with total-f gyrokinetic simulations, including both collisional and turbulent transport. This prediction is validated with a synthetic diagnostic of the bolometry. Although nitrogen impurities are shown to reduce the neoclassical peaking of tungsten on-axis, the overall tungsten peaking increases when nitrogen impurities are present, as they reduce the turbulence screening off-axis. This finding is important for the plasma current ramp-up phase of ITER, where light impurities seeding will be desirable to achieve low temperatures at the plasma-facing components and reduce tungsten sputtering. It provides further argument for applying early ECRH heating to maintain margins on the core power balance. The neoclassical peaking factor is cross-verified between XGC and FACIT. The heat flux at separatrix and the heat load width are modeled by XGC and compared to WEST data.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: WEST team

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; AC05-00OR22725

OSTI ID:: 2477138

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 65; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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gyrokinetic
nitrogen impurities
tungsten peaking

Title: Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impurities

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