Divertor plasma detachment: roles of plasma momentum, energy, and particle balances

Krasheninnikov, S. I.; Kukushkin, A. S.; Pshenov, A. A.

doi:10.1088/1361-6587/ac9a6f

Divertor plasma detachment: roles of plasma momentum, energy, and particle balances

Journal Article · 04 November 2022 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac9a6f· OSTI ID:2419033

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OSTI

Abstract

Contrary to statements from some recent papers, the bifurcation of the scrape-off layer and divertor plasma parameters, as described within a 1D model, does exist. The analysis of both numerical simulations and experimental data shows that the real physical reasons that can cause a strong reduction of the plasma particle flux to the target $j_{d}$ are impurity radiation loss and volumetric plasma recombination. Fitting the parameter describing the ‘plasma momentum removal’, based on the results of 2D numerical simulations, then using this fit in subsequent analytic expressions for $j_{d}$ , and finally interpreting the evolution of $j_{d}$ as the result of elastic plasma-neutral interactions break the causality principle and lead to a wrong physical picture of divertor plasma detachment.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-04ER54739

OSTI ID:: 2419033

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 64; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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