Self‐consistent transport simulation of boron dust particle injection in the peripheral plasma in Large Helical Device

Journal Article · 28 February 2024 · Contributions to Plasma Physics

DOI: https://doi.org/10.1002/ctpp.202300105 · OSTI ID:2325478

Shoji, M. ^[1]; Kawamura, G. ^[1]; Smirnov, R. ^[2]; Tanaka, Y. ^[3]; Masuzaki, S. ^[1]; Nespoli, F. ^[4]; Gilson, E. ^[4]; Lunsford, R. ^[4]

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1. National Institute for Fusion Science National Institutes of Natural Sciences Gifu Japan, Fusion Science Program Graduate University for Advanced Studies (SOKENDAI) Hayama Japan
2. Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla California USA
3. Institute of Science and Engineering Kanazawa University Kanazawa Japan
4. Department of Energy National Laboratory Princeton Plasma Physics Laboratory Princeton New Jersey USA

Abstract The trajectories and the ablation positions of boron dust particles dropped from an impurity powder dropper in the peripheral plasma in the Large Helical Device (LHD) were calculated using a three‐dimensional edge plasma simulation code (EMC3‐EIRENE) and a dust transport simulation code (DUSTT). The simulation shows that the trajectory of the boron dust particles is deflected at the upper divertor leg due to the effect of the hydrogen plasma flow, and the ablation positions of the dust particles in an ergodic layer change toward the outboard side of the torus for higher plasma densities. The effect of the boron ion flow in the divertor leg on the deflection is investigated by coupling the two codes self‐consistently. The simulation predicts that the boron ions in the divertor leg, which are produced by sputtering on the divertor plates, which do not affect the change in the ablation positions. It also shows that the ablation positions move toward the inboard side and approach the Last Closed Flux Surface (LCFS) in case of increased boron dust drop rates, which is caused by the lowered plasma flow in the upper divertor leg due to the lowered electron temperature by radiation cooling by the dropped dust particles.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-09CH11466
• OSTI ID: 2325478
• Journal Information: Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 7-8 Vol. 64; ISSN 0863-1042
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English