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)]
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 i...
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American Institute of Physics (AIP)
2018
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| Online Access: | http://hdl.handle.net/1721.1/113084 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
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| author | Lore, J. D. Reinke, M. L. Lipschultz, B. Pitts, R. A. Feng, Y. Brunner, Daniel Frederic Labombard, Brian Terry, James L |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Lore, J. D. Reinke, M. L. Lipschultz, B. Pitts, R. A. Feng, Y. Brunner, Daniel Frederic Labombard, Brian Terry, James L |
| author_sort | Lore, J. D. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:43:24Z |
| format | Article |
| id | mit-1721.1/113084 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:43:24Z |
| publishDate | 2018 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/1130842022-09-27T21:28:51Z 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)] Lore, J. D. Reinke, M. L. Lipschultz, B. Pitts, R. A. Feng, Y. Brunner, Daniel Frederic Labombard, Brian Terry, James L Massachusetts Institute of Technology. Plasma Science and Fusion Center Brunner, Daniel Frederic Labombard, Brian Terry, James L 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. United States. Department of Energy (Contract DE-AC05-00OR22725) United States. Department of Energy (Contract DE-FC02-99ER54512) 2018-01-12T16:20:12Z 2018-01-12T16:20:12Z 2015-04 2014-12 2018-01-11T15:11:11Z Article http://purl.org/eprint/type/JournalArticle 1070-664X 1089-7674 http://hdl.handle.net/1721.1/113084 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 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 http://dx.doi.org/10.1063/1.4919393 Physics of Plasmas Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics (AIP) MIT Plasma Science & Fusion Center |
| spellingShingle | Lore, J. D. Reinke, M. L. Lipschultz, B. Pitts, R. A. Feng, Y. Brunner, Daniel Frederic Labombard, Brian Terry, James L 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)] |
| title | 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)] |
| title_full | 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)] |
| title_fullStr | 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)] |
| title_full_unstemmed | 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)] |
| title_short | 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)] |
| title_sort | 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 |
| url | http://hdl.handle.net/1721.1/113084 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
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