Detachment scalings derived from 1D scrape-off-layer simulations

Body, Thomas; Eich, Thomas; Kuang, Adam; Looby, Tom; Kryjak, Mike; Dudson, Ben; Reinke, Matthew

doi:10.1016/j.nme.2024.101819

Title: Detachment scalings derived from 1D scrape-off-layer simulations

Journal Article · 19 November 2024 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2024.101819 · OSTI ID:2504056

^[1];

^[2]; Dudson, Ben ^[3]; Reinke, Matthew ^[1]

Commonwealth Fusion Systems, Devens, MA (United States)
University of York (United Kingdom)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Fusion power plants will require detachment to mitigate sputtering and keep divertor heat fluxes at tolerable levels. Controlling detachment on these devices may require the use of real-time scrape-off-layer modeling to complement the limited set of available diagnostics. In this work, we use the configurable Hermes-3 edge modeling framework to perform time-dependent, fixed-fraction-impurity 1D detachment simulations. Although currently far from real-time, these simulations are used to investigate time-dependent effects and the minimum physics set required for control-relevant modeling. We show that these simulations reproduce the expected rollover of the target ion flux — a typical characteristic of detachment onset. We also perform scans of the input heat flux and impurity concentration and show that the steady-state results closely match the scalings predicted by the 0D time-independent Lengyel–Goedheer model. This allows us to indirectly compare to SOLPS simulations, which find a similar scaling but a lower value for the impurity concentration required for detachment for given upstream conditions. We use this result to suggest a series of improvements for the Hermes simulations, and finally show simulations demonstrating the impact of time-dependence.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2504056

Report Number(s):: LLNL--JRNL-865386; 1099387

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 41; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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