Dependence of high- Z redeposition on the field-to-surface pitch angle and other sheath parameters in tokamaks

Easley, D. C.; Diaw, A.; Younkin, T. R.; Donovan, D. C.; Unterberg, E. A.; Nichols, J. H.; Johnson, C. A.; Kumar, A.

doi:10.1063/5.0187331

Title: Dependence of high- Z redeposition on the field-to-surface pitch angle and other sheath parameters in tokamaks

Journal Article · 05 May 2024 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0187331 · OSTI ID:2567623

; Diaw, A.; Younkin, T. R.;

;

; Johnson, C. A.;

Accurately predicting redeposition is vital for high-Z plasma-facing component (PFC) survivability in magnetic confinement fusion. In this study, we categorize high-Z redeposition into three mechanisms: geometric-driven (prompt), sheath-driven (local), and scrape-off-layer-driven (far) redeposition. To investigate these mechanisms, we employ Monte Carlo transport codes to simulate azimuthally symmetric tungsten source erosion and redeposition in a tokamak. By iteratively analyzing critical parameters, we evaluate redeposition scaling for each mechanism. Specifically, we investigate the impact of magnetic-field-to-PFC pitch angle assumptions on PFC losses into the scrape-off layer. Our findings reveal significant pitch angle sensitivity due to an asymmetric prompt vs local redeposition trade-off. These results enhance our understanding of redeposition phenomena in fusion plasma environments.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725; SC0019256

OSTI ID:: 2567623

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Dependence of high- Z redeposition on the field-to-surface pitch angle and other sheath parameters in tokamaks

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