Theory-based scaling laws of near and far scrape-off layer widths in single-null L-mode discharges

Giacomin, M.; Stagni, A.; Ricci, P.; Boedo, J. A.; Horacek, J.; Reimerdes, H.; Tsui, C. K.

doi:10.1088/1741-4326/abf8f6

Theory-based scaling laws of near and far scrape-off layer widths in single-null L-mode discharges

Journal Article · Thu May 13 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abf8f6· OSTI ID:1851399

^[1]; ; Ricci, P.; Boedo, J. A.; ; ;

OSTI

Abstract

Theory-based scaling laws of the near and far scrape-off layer (SOL) widths are analytically derived for L-mode diverted tokamak discharges by using a two-fluid model. The near SOL pressure and density decay lengths are obtained by leveraging a balance among the power source, perpendicular turbulent transport across the separatrix, and parallel losses at the vessel wall, while the far SOL pressure and density decay lengths are derived by using a model of intermittent transport mediated by filaments. The analytical estimates of the pressure decay length in the near SOL is then compared to the results of three-dimensional, flux-driven, global, two-fluid turbulence simulations of L-mode diverted tokamak plasmas, and validated against experimental measurements taken from an experimental multi-machine database of divertor heat flux profiles, showing in both cases a very good agreement. Analogously, the theoretical scaling law for the pressure decay length in the far SOL is compared to simulation results and to experimental measurements in TCV L-mode discharges, pointing out the need of a large multi-machine database for the far SOL decay lengths.

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0010529

OSTI ID:: 1851399

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 7 Vol. 61; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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