Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE[superscript a)]
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3D simulation.pdf
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Author(s)
Lore, J. D.
Reinke, M. L.
Lipschultz, B.
Pitts, R. A.
Feng, Y.
Brunner, Daniel Frederic
Labombard, Brian
Terry, James L
Date Issued
April 2015
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Lore, J. D., M. L. Reinke, D. Brunner, B. LaBombard, B. Lipschultz, J. Terry, R. A. Pitts, and Y. Feng. “Three-dimensional simulation of H-mode plasmas with localized divertor impurity injection on Alcator C-Mod using the edge transport code EMC3-EIRENE[superscript a)].” Physics of Plasmas 22, 5 (May 2015): 056106 © 2015 AIP Publishing
Version
Author's final manuscript
Abstract
Experiments in Alcator C-Mod to assess the level of toroidal asymmetry in divertor conditions resulting from poloidally and toroidally localized extrinsic impurity gas seeding show a weak toroidal peaking (∼1.1) in divertor electron temperatures for high-power enhanced D-alpha H-mode plasmas. This is in contrast to similar experiments in Ohmically heated L-mode plasmas, which showed a clear toroidal modulation in the divertor electron temperature. Modeling of these experiments using the 3D edge transport code EMC3-EIRENE [Y. Feng et al., J. Nucl. Mater. 241, 930 (1997)] qualitatively reproduces these trends, and indicates that the different response in the simulations is due to the ionization location of the injected nitrogen. Low electron temperatures in the private flux region (PFR) in L-mode result in a PFR plasma that is nearly transparent to neutral nitrogen, while in H-mode the impurities are ionized in close proximity to the injection location, with this latter case yielding a largely axisymmetric radiation pattern in the scrape-off-layer. The consequences for the ITER gas injection system are discussed. Quantitative agreement with the experiment is lacking in some areas, suggesting potential areas for improving the physics model in EMC3-EIRENE.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1063/1.4919393
