EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod
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 inje...
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| Format: | Article |
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Elsevier
2018
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| Online Access: | http://hdl.handle.net/1721.1/113069 https://orcid.org/0000-0002-7841-9261 |
| _version_ | 1811076381598023680 |
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| author | Lore, J.D. Reinke, M.L. Lipschultz, B. Pitts, R.A. Feng, Y. Labombard, Brian Churchill, Randy Michael |
| 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. Labombard, Brian Churchill, Randy Michael |
| author_sort | Lore, J.D. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:20:33Z |
| format | Article |
| id | mit-1721.1/113069 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:20:33Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1130692022-09-26T17:20:42Z EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod Lore, J.D. Reinke, M.L. Lipschultz, B. Pitts, R.A. Feng, Y. Labombard, Brian Churchill, Randy Michael Massachusetts Institute of Technology. Plasma Science and Fusion Center Labombard, Brian Churchill, Randy Michael 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. United States. Department of Energy (Contract DE-AC05-00OR22725) United States. Department of Energy (Contract DE-FC02-99ER54512) 2018-01-11T20:29:47Z 2018-01-11T20:29:47Z 2014-09 2018-01-11T15:39:21Z Article http://purl.org/eprint/type/JournalArticle 0022-3115 http://hdl.handle.net/1721.1/113069 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. https://orcid.org/0000-0002-7841-9261 http://dx.doi.org/10.1016/J.JNUCMAT.2014.09.053 Journal of Nuclear Materials Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier MIT Plasma Science & Fusion Center |
| spellingShingle | Lore, J.D. Reinke, M.L. Lipschultz, B. Pitts, R.A. Feng, Y. Labombard, Brian Churchill, Randy Michael EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title | EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title_full | EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title_fullStr | EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title_full_unstemmed | EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title_short | EMC3-EIRENE modeling of toroidally-localized divertor gas injection experiments on Alcator C-Mod |
| title_sort | emc3 eirene modeling of toroidally localized divertor gas injection experiments on alcator c mod |
| url | http://hdl.handle.net/1721.1/113069 https://orcid.org/0000-0002-7841-9261 |
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