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Title: EMC3-EIRENE modelling of toroidally-localized divertor gas injection experiments on Alcator C-Mod

Abstract

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 modelling, with the simulation yielding a toroidal asymmetry in the heat flow to the outer strike point. Finally, 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.

Authors:
 [1];  [2];  [3];  [2];  [3];  [4];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of York (United Kingdom). York Plasma Inst., Dept. of Physics
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. ITER Organization, St. Paul Lez Durance (France)
  5. Max Planck Inst. for Plasma Physics, Garching (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1286776
Grant/Contract Number:  
AC05-00OR22725; FC02-99ER54512
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 463; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Alcator C-Mod; Divertor Detachment; Divertor Modelling; Edge Monte Carlo

Citation Formats

Lore, Jeremy D., Reinke, M. L., LaBombard, Brian, Lipschultz, B., Churchill, R. M., Pitts, R. A., and Feng, Y. EMC3-EIRENE modelling of toroidally-localized divertor gas injection experiments on Alcator C-Mod. United States: N. p., 2014. Web. doi:10.1016/j.jnucmat.2014.09.053.
Lore, Jeremy D., Reinke, M. L., LaBombard, Brian, Lipschultz, B., Churchill, R. M., Pitts, R. A., & Feng, Y. EMC3-EIRENE modelling of toroidally-localized divertor gas injection experiments on Alcator C-Mod. United States. https://doi.org/10.1016/j.jnucmat.2014.09.053
Lore, Jeremy D., Reinke, M. L., LaBombard, Brian, Lipschultz, B., Churchill, R. M., Pitts, R. A., and Feng, Y. 2014. "EMC3-EIRENE modelling of toroidally-localized divertor gas injection experiments on Alcator C-Mod". United States. https://doi.org/10.1016/j.jnucmat.2014.09.053. https://www.osti.gov/servlets/purl/1286776.
@article{osti_1286776,
title = {EMC3-EIRENE modelling of toroidally-localized divertor gas injection experiments on Alcator C-Mod},
author = {Lore, Jeremy D. and Reinke, M. L. and LaBombard, Brian and Lipschultz, B. and Churchill, R. M. and Pitts, R. A. and Feng, Y.},
abstractNote = {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 modelling, with the simulation yielding a toroidal asymmetry in the heat flow to the outer strike point. Finally, 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.},
doi = {10.1016/j.jnucmat.2014.09.053},
url = {https://www.osti.gov/biblio/1286776}, journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = ,
volume = 463,
place = {United States},
year = {Tue Sep 30 00:00:00 EDT 2014},
month = {Tue Sep 30 00:00:00 EDT 2014}
}

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Works referenced in this record:

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Works referencing / citing this record: