Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas
Core impurity transport has been investigated for a variety of confinement regimes in Alcator C-Mod plasmas from x-ray emission following injection of medium and high Z materials. In ohmic L-mode discharges, impurity transport is anomalous (D[subscript eff] ≫ D[subscript nc]) and changes very little...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/108753 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-3757-7730 https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-9001-5606 |
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| author | Reinke, M.L. Delgado-Aparicio, L. Scott, S.D. Rice, John E Gao, Chi Howard, Nathaniel Thomas Chilenski, Mark Alan Granetz, Robert S Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Irby, James Henderson Lin, Yijun Marmar, Earl S Mumgaard, Robert Thomas Terry, James L Walk Jr, John R White, Anne E. Whyte, Dennis G Wolfe, Stephen M Wukitch, Stephen James |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Reinke, M.L. Delgado-Aparicio, L. Scott, S.D. Rice, John E Gao, Chi Howard, Nathaniel Thomas Chilenski, Mark Alan Granetz, Robert S Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Irby, James Henderson Lin, Yijun Marmar, Earl S Mumgaard, Robert Thomas Terry, James L Walk Jr, John R White, Anne E. Whyte, Dennis G Wolfe, Stephen M Wukitch, Stephen James |
| author_sort | Reinke, M.L. |
| collection | MIT |
| description | Core impurity transport has been investigated for a variety of confinement regimes in Alcator C-Mod plasmas from x-ray emission following injection of medium and high Z materials. In ohmic L-mode discharges, impurity transport is anomalous (D[subscript eff] ≫ D[subscript nc]) and changes very little across the LOC/SOC boundary. In ion cyclotron range of frequencies (ICRF) heated L-mode plasmas, the core impurity confinement time decreases with increasing ICRF input power (and subsequent increasing electron temperature) and increases with plasma current. Nearly identical impurity confinement characteristics are observed in I-mode plasmas. In enhanced D[subscript α] H-mode discharges the core impurity confinement times are much longer. There is a strong connection between core impurity confinement time and the edge density gradient across all confinement regimes studied here. Deduced central impurity density profiles in stationary plasmas are generally flat, in spite of large amplitude sawtooth oscillations, and there is little evidence of impurity convection inside of r/a = 0.3 when averaged over sawteeth. |
| first_indexed | 2024-09-23T15:05:31Z |
| format | Article |
| id | mit-1721.1/108753 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:05:31Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1087532022-09-29T12:38:53Z Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas Reinke, M.L. Delgado-Aparicio, L. Scott, S.D. Rice, John E Gao, Chi Howard, Nathaniel Thomas Chilenski, Mark Alan Granetz, Robert S Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Irby, James Henderson Lin, Yijun Marmar, Earl S Mumgaard, Robert Thomas Terry, James L Walk Jr, John R White, Anne E. Whyte, Dennis G Wolfe, Stephen M Wukitch, Stephen James Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Whyte Dennis Rice, John E Gao, Chi Howard, Nathaniel Thomas Chilenski, Mark Alan Granetz, Robert S Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Irby, James Henderson Lin, Yijun Marmar, Earl S Mumgaard, Robert Thomas Terry, James L Walk Jr, John R White, Anne E. Whyte, Dennis G Wolfe, Stephen M Wukitch, Stephen James Core impurity transport has been investigated for a variety of confinement regimes in Alcator C-Mod plasmas from x-ray emission following injection of medium and high Z materials. In ohmic L-mode discharges, impurity transport is anomalous (D[subscript eff] ≫ D[subscript nc]) and changes very little across the LOC/SOC boundary. In ion cyclotron range of frequencies (ICRF) heated L-mode plasmas, the core impurity confinement time decreases with increasing ICRF input power (and subsequent increasing electron temperature) and increases with plasma current. Nearly identical impurity confinement characteristics are observed in I-mode plasmas. In enhanced D[subscript α] H-mode discharges the core impurity confinement times are much longer. There is a strong connection between core impurity confinement time and the edge density gradient across all confinement regimes studied here. Deduced central impurity density profiles in stationary plasmas are generally flat, in spite of large amplitude sawtooth oscillations, and there is little evidence of impurity convection inside of r/a = 0.3 when averaged over sawteeth. United States. Department of Energy (Contract DE-FC02-99ER54512) United States. Dept. of Energy. Fusion Energy Postdoctoral Research Program (Oak Ridge Institute for Science and Education) 2017-05-08T18:55:16Z 2017-05-08T18:55:16Z 2015-02 2014-12 Article http://purl.org/eprint/type/JournalArticle 0029-5515 1741-4326 http://hdl.handle.net/1721.1/108753 Rice, J.E. et al. “Core Impurity Transport in Alcator C-Mod L-, I- and H-Mode Plasmas.” Nuclear Fusion 55.3 (2015): 033014. https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-3757-7730 https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-9001-5606 en_US http://dx.doi.org/10.1088/0029-5515/55/3/033014 Nuclear Fusion Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing Prof. Whyte via Chris Sherratt |
| spellingShingle | Reinke, M.L. Delgado-Aparicio, L. Scott, S.D. Rice, John E Gao, Chi Howard, Nathaniel Thomas Chilenski, Mark Alan Granetz, Robert S Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Irby, James Henderson Lin, Yijun Marmar, Earl S Mumgaard, Robert Thomas Terry, James L Walk Jr, John R White, Anne E. Whyte, Dennis G Wolfe, Stephen M Wukitch, Stephen James Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title | Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title_full | Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title_fullStr | Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title_full_unstemmed | Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title_short | Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas |
| title_sort | core impurity transport in alcator c mod l i and h mode plasmas |
| url | http://hdl.handle.net/1721.1/108753 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-3757-7730 https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-9001-5606 |
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