Reduced-model scrape-off layer turbulence (nSOLT) simulations comparing three fueling scenarios

Russell, D. A.; Myra, J. R.; Militello, F.; Moulton, D.

doi:10.1063/5.0060524

Title: Reduced-model scrape-off layer turbulence (nSOLT) simulations comparing three fueling scenarios

Journal Article · Wed Sep 15 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0060524· OSTI ID:1821691

^[1];

^[2]; Moulton, D. ^[2]

Lodestar Research Corporation, Boulder, CO (United States)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

The 2D scrape-off-layer turbulence code (nSOLT) includes 1D Boltzmann neutral–plasma interactions, a model of divertor recycling (introduced here), and a fixed source of plasma concentrated at the core-side boundary. Three fueling methods are considered herein: (1) neutral injection in the far-SOL is accomplished by specifying the density of Franck–Condon distributed neutrals streaming in from the boundary. (2) Divertor recycling is modeled by injecting a fraction of the particle parallel flux in the scrape-off layer (SOL) back into the edge region as a source of plasma. (3) A constant source fuels the edge plasma from the core-side boundary to model pellet injection. For machine parameters (B, R_m, and L_//) illustrative of the MAST-U device, and for a deuterium plasma, turbulent equilibria are obtained that share the same plasma fueling rate for each of the three fueling methods, with only one of the sources on in each case. In the presence of self-consistent turbulence, quasi-steady plasma and neutral (deuterium) profiles, fueling efficiencies, SOL transparencies, and heat flux widths are compared. Characteristics of the turbulent fluctuations, including skewness, cross-phases, and power spectra, are described. The calculated fueling efficiencies, SOL transparencies to neutral penetration, and many of the turbulent properties are remarkably similar for all three fueling methods despite significant differences in the plasma profiles. The nonlinear states of the three cases are dominated by separatrix-spanning vortex cells that control particle and heat losses into the SOL.

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Research Organization:: Lodestar Research Corp., Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-97ER54392; SC0019270

OSTI ID:: 1821691

Report Number(s):: LRC-21-188; DOE-ER/-54392-98; TRN: US2214379

Journal Information:: Physics of Plasmas, Vol. 28, Issue 9; Related Information: https://doi.org/10.5281/zenodo.4994177; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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