Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod
IR thermography is used to measure the heat flux footprints on C-Mod’s outer target in I-mode and EDA H-mode plasmas. The footprint profiles are fit to a function with a simple physical interpretation. The fit parameter that is sensitive to the power decay length into the SOL, λ[subscript SOL], is ~...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2015
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| Online Access: | http://hdl.handle.net/1721.1/99469 https://orcid.org/0000-0002-9001-5606 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
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| author | Labombard, Brian Brunner, Daniel Frederic Reinke, Matthew Logan Terry, James L Hughes Jr, Jerry Whyte, Dennis G |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Labombard, Brian Brunner, Daniel Frederic Reinke, Matthew Logan Terry, James L Hughes Jr, Jerry Whyte, Dennis G |
| author_sort | Labombard, Brian |
| collection | MIT |
| description | IR thermography is used to measure the heat flux footprints on C-Mod’s outer target in I-mode and EDA H-mode plasmas. The footprint profiles are fit to a function with a simple physical interpretation. The fit parameter that is sensitive to the power decay length into the SOL, λ[subscript SOL], is ~1–3× larger in I-modes than in H-modes at similar plasma current, which is the dominant dependence for the H-mode λ[subscript SOL]. In contrast, the fit parameter sensitive to transport into the private-flux-zone along the divertor leg is somewhat smaller in I-mode than in H-mode, but otherwise displays no obvious dependence on I[subscript p], B[subscript t], or stored energy. A third measure of the footprint width, the “integral width”, is not significantly different between H- and I-modes. Also discussed are significant differences in the global power flows of the H-modes with “favorable” ∇B drift direction and those of the I-modes with “unfavorable” ∇B drift direction. |
| first_indexed | 2024-09-23T10:30:20Z |
| format | Article |
| id | mit-1721.1/99469 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:30:20Z |
| publishDate | 2015 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/994692023-02-26T03:32:51Z Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod Labombard, Brian Brunner, Daniel Frederic Reinke, Matthew Logan Terry, James L Hughes Jr, Jerry Whyte, Dennis G Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Terry, James L. Labombard, Brian Brunner, Daniel Frederic Hughes, Jerry W., Jr. Reinke, Matthew Logan Whyte, Dennis G. IR thermography is used to measure the heat flux footprints on C-Mod’s outer target in I-mode and EDA H-mode plasmas. The footprint profiles are fit to a function with a simple physical interpretation. The fit parameter that is sensitive to the power decay length into the SOL, λ[subscript SOL], is ~1–3× larger in I-modes than in H-modes at similar plasma current, which is the dominant dependence for the H-mode λ[subscript SOL]. In contrast, the fit parameter sensitive to transport into the private-flux-zone along the divertor leg is somewhat smaller in I-mode than in H-mode, but otherwise displays no obvious dependence on I[subscript p], B[subscript t], or stored energy. A third measure of the footprint width, the “integral width”, is not significantly different between H- and I-modes. Also discussed are significant differences in the global power flows of the H-modes with “favorable” ∇B drift direction and those of the I-modes with “unfavorable” ∇B drift direction. United States. Dept. of Energy (Cooperative Agreement DE-FC02-99-ER54512) 2015-10-27T14:30:40Z 2015-10-27T14:30:40Z 2013-01 Article http://purl.org/eprint/type/JournalArticle 00223115 http://hdl.handle.net/1721.1/99469 Terry, J.L., B. LaBombard, D. Brunner, J.W. Hughes, M.L. Reinke, and D.G. Whyte. “Heat-Flux Footprints for I-Mode and EDA H-Mode Plasmas on Alcator C-Mod.” Journal of Nuclear Materials 438 (July 2013): S212–S215. https://orcid.org/0000-0002-9001-5606 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 en_US http://dx.doi.org/10.1016/j.jnucmat.2013.01.029 Journal of Nuclear Materials Creative Commons Attribution-Noncommercial-NoDerivatives http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier MIT Web Domain |
| spellingShingle | Labombard, Brian Brunner, Daniel Frederic Reinke, Matthew Logan Terry, James L Hughes Jr, Jerry Whyte, Dennis G Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title | Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title_full | Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title_fullStr | Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title_full_unstemmed | Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title_short | Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod |
| title_sort | heat flux footprints for i mode and eda h mode plasmas on alcator c mod |
| url | http://hdl.handle.net/1721.1/99469 https://orcid.org/0000-0002-9001-5606 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
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