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Predictive Modeling of a Lithium Vapor Box Divertor in NSTX-U using SOLPS-ITER by Emdee, E. D.; Goldston, R. J.; Lore, J. D; Zhang, X. is a scholarly article available to read on EtoBox.

What is Predictive Modeling of a Lithium Vapor Box Divertor in NSTX-U using SOLPS-ITER about?

The lithium vapor box divertor aims to detach the divertor plasma via evaporating and condensing lithium surfaces. By evaporating lithium near or at the divertor plate and condensing it closer to the main chamber, a lithium vapor density gradient can be created. This density gradient ties energy losses to poloidal distance between the target and the detachment point. The radiation zone is then prevented from reaching the X-point as the lithium ionization rate decreases when the detachment front moves away from the divertor target. Here we present Scrape Off Layer Plasma Simulator (SOLPS) simulations of a lithium vapor box divertor using an NSTX-U equilibrium and PFC geometry. The parameters for the core boundary conditions, gas puff intensity, and heat and particle transport coefficients are chosen to match experimental values. Acceptable agreement with experimental Scrape-Off Layer (SOL) widths is found, indicating a reasonable choice of transport coefficients. In predictive simulations, lithium is added via evaporation at the target. Predictions for peak heat fluxes and upstream impurity concentration are given for a variety of evaporation rates. Target electron temperature is pr

Author

Emdee, E. D.; Goldston, R. J.; Lore, J. D; Zhang, X.

Published

2021

Language

EN