EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod
Author(s)Lore, J.D.; Reinke, M.L.; Lipschultz, B.; Pitts, R.A.; Feng, Y.; Labombard, Brian; Churchill, Randy Michael; ... Show more Show less
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Experiments on Alcator C-Mod with toroidally and poloidally localized divertor nitrogen injection have been modeled using the three-dimensional edge transport code EMC3-EIRENE to elucidate the mechanisms driving measured toroidal asymmetries. In these experiments five toroidally distributed gas injectors in the private flux region were sequentially activated in separate discharges resulting in clear evidence of toroidal asymmetries in radiated power and nitrogen line emission as well as a ∼50% toroidal modulation in electron pressure at the divertor target. The pressure modulation is qualitatively reproduced by the modeling, with the simulation yielding a toroidal asymmetry in the heat flow to the outer strike point. Toroidal variation in impurity line emission is qualitatively matched in the scrape-off layer above the strike point, however kinetic corrections and cross-field drifts are likely required to quantitatively reproduce impurity behavior in the private flux region and electron temperatures and densities directly in front of the target.
DepartmentMassachusetts Institute of Technology. Plasma Science and Fusion Center
Journal of Nuclear Materials
Lore, J.D. et al. “EMC3-EIRENE Modeling of Toroidally-Localized Divertor Gas Injection Experiments on Alcator C-Mod.” Journal of Nuclear Materials 463 (August 2015): 515–518. © 2014 Elsevier B.V.
Author's final manuscript