Effect of drifts and currents on the validity of a fluid model for the atoms in the plasma edge

Wim Van Uytven; Wouter Dekeyser; Maarten Blommaert; Niels Horsten; Martine Baelmans

doi:10.1016/j.nme.2022.101255

Effect of drifts and currents on the validity of a fluid model for the atoms in the plasma edge

Wim Van Uytven^*, Wouter Dekeyser, Maarten Blommaert, Niels Horsten, Martine Baelmans

^*Corresponding author for this work

Department of Applied Physics

KU Leuven

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

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Abstract

The performance of advanced fluid neutral models for the simulation of deuterium atoms in the plasma edge of magnetically confined fusion devices is tested for the first time on cases that include drifts and currents in the plasma model, on a simplified Alcator C-mod case. The unadapted advanced fluid neutral model already gives quantitative agreement, with 5–30% fluid-kinetic discrepancy in the broad vicinity of the strikepoint. A new advective perpendicular transport term is proposed, which further reduces the fluid-kinetic discrepancies for cases with drifts. It is also shown that the ion-neutral current can be calculated consistently for fluid or kinetic neutrals, at least when only atoms are considered. However, its effect on the solution is very small for the studied case.

Original language	English
Article number	101255
Journal	Nuclear Materials and Energy
Volume	33
DOIs	https://doi.org/10.1016/j.nme.2022.101255
Publication status	Published - Oct 2022
MoE publication type	A1 Journal article-refereed

Keywords

Alcator C-mod
Drifts & currents
Fluid neutral atoms
Ion-neutral current
Plasma-edge modeling

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title = "Effect of drifts and currents on the validity of a fluid model for the atoms in the plasma edge",

abstract = "The performance of advanced fluid neutral models for the simulation of deuterium atoms in the plasma edge of magnetically confined fusion devices is tested for the first time on cases that include drifts and currents in the plasma model, on a simplified Alcator C-mod case. The unadapted advanced fluid neutral model already gives quantitative agreement, with 5–30% fluid-kinetic discrepancy in the broad vicinity of the strikepoint. A new advective perpendicular transport term is proposed, which further reduces the fluid-kinetic discrepancies for cases with drifts. It is also shown that the ion-neutral current can be calculated consistently for fluid or kinetic neutrals, at least when only atoms are considered. However, its effect on the solution is very small for the studied case.",

keywords = "Alcator C-mod, Drifts & currents, Fluid neutral atoms, Ion-neutral current, Plasma-edge modeling",

author = "{Van Uytven}, Wim and Wouter Dekeyser and Maarten Blommaert and Niels Horsten and Martine Baelmans",

note = "Funding Information: The first author is funded by a PhD fellowship of the Research Foundation - Flanders . Parts of this work have been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The computational resources and services used in this work were provided by the VSC (Flemish Supercomputer Center), funded by the Research Foundation Flanders (FWO) and the Flemish Government - department EWI . Publisher Copyright: {\textcopyright} 2022 The Author(s)",

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doi = "10.1016/j.nme.2022.101255",

language = "English",

volume = "33",

journal = "Nuclear Materials and Energy",

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AU - Blommaert, Maarten

AU - Horsten, Niels

AU - Baelmans, Martine

N1 - Funding Information: The first author is funded by a PhD fellowship of the Research Foundation - Flanders . Parts of this work have been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The computational resources and services used in this work were provided by the VSC (Flemish Supercomputer Center), funded by the Research Foundation Flanders (FWO) and the Flemish Government - department EWI . Publisher Copyright: © 2022 The Author(s)

PY - 2022/10

Y1 - 2022/10

N2 - The performance of advanced fluid neutral models for the simulation of deuterium atoms in the plasma edge of magnetically confined fusion devices is tested for the first time on cases that include drifts and currents in the plasma model, on a simplified Alcator C-mod case. The unadapted advanced fluid neutral model already gives quantitative agreement, with 5–30% fluid-kinetic discrepancy in the broad vicinity of the strikepoint. A new advective perpendicular transport term is proposed, which further reduces the fluid-kinetic discrepancies for cases with drifts. It is also shown that the ion-neutral current can be calculated consistently for fluid or kinetic neutrals, at least when only atoms are considered. However, its effect on the solution is very small for the studied case.

AB - The performance of advanced fluid neutral models for the simulation of deuterium atoms in the plasma edge of magnetically confined fusion devices is tested for the first time on cases that include drifts and currents in the plasma model, on a simplified Alcator C-mod case. The unadapted advanced fluid neutral model already gives quantitative agreement, with 5–30% fluid-kinetic discrepancy in the broad vicinity of the strikepoint. A new advective perpendicular transport term is proposed, which further reduces the fluid-kinetic discrepancies for cases with drifts. It is also shown that the ion-neutral current can be calculated consistently for fluid or kinetic neutrals, at least when only atoms are considered. However, its effect on the solution is very small for the studied case.

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JO - Nuclear Materials and Energy

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Effect of drifts and currents on the validity of a fluid model for the atoms in the plasma edge

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