Analysis of edge stability for models of heat flux width
Detailed measurements of the ne, Te, and Ti profiles in the vicinity of the separatrix of ELMing H-mode discharges have been used to examine plasma stability at the extreme edge of the plasma and assess stability dependent models of the heat flux width. The results are strongly contrary to the criti...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-08-01
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| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179116302538 |
| _version_ | 1818164262314442752 |
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| author | M.A. Makowski C.J. Lasnier A.W. Leonard T.H. Osborne |
| author_facet | M.A. Makowski C.J. Lasnier A.W. Leonard T.H. Osborne |
| author_sort | M.A. Makowski |
| collection | DOAJ |
| description | Detailed measurements of the ne, Te, and Ti profiles in the vicinity of the separatrix of ELMing H-mode discharges have been used to examine plasma stability at the extreme edge of the plasma and assess stability dependent models of the heat flux width. The results are strongly contrary to the critical gradient model, which posits that a ballooning instability determines a gradient scale length related to the heat flux width. The results of this analysis are not sensitive to the choice of location to evaluate stability. Significantly, it is also found that the results are completely consistent with the heuristic drift model for the heat flux width. Here the edge pressure gradient scales with plasma density and is proportional to the pressure gradient inferred from the equilibrium in accordance with the predictions of that theory. |
| first_indexed | 2024-12-11T17:02:39Z |
| format | Article |
| id | doaj.art-0e2d075d93b9413fa4e637280ba9cf9a |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-11T17:02:39Z |
| publishDate | 2017-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-0e2d075d93b9413fa4e637280ba9cf9a2022-12-22T00:57:47ZengElsevierNuclear Materials and Energy2352-17912017-08-011210101014Analysis of edge stability for models of heat flux widthM.A. Makowski0C.J. Lasnier1A.W. Leonard2T.H. Osborne3Lawrence Livermore National Laboratory, Livermore, CA 94550, USA; Corresponding author.Lawrence Livermore National Laboratory, Livermore, CA 94550, USAGeneral Atomics, P.O. Box 85608, San Diego, California 92186-5608, USAGeneral Atomics, P.O. Box 85608, San Diego, California 92186-5608, USADetailed measurements of the ne, Te, and Ti profiles in the vicinity of the separatrix of ELMing H-mode discharges have been used to examine plasma stability at the extreme edge of the plasma and assess stability dependent models of the heat flux width. The results are strongly contrary to the critical gradient model, which posits that a ballooning instability determines a gradient scale length related to the heat flux width. The results of this analysis are not sensitive to the choice of location to evaluate stability. Significantly, it is also found that the results are completely consistent with the heuristic drift model for the heat flux width. Here the edge pressure gradient scales with plasma density and is proportional to the pressure gradient inferred from the equilibrium in accordance with the predictions of that theory.http://www.sciencedirect.com/science/article/pii/S2352179116302538 |
| spellingShingle | M.A. Makowski C.J. Lasnier A.W. Leonard T.H. Osborne Analysis of edge stability for models of heat flux width Nuclear Materials and Energy |
| title | Analysis of edge stability for models of heat flux width |
| title_full | Analysis of edge stability for models of heat flux width |
| title_fullStr | Analysis of edge stability for models of heat flux width |
| title_full_unstemmed | Analysis of edge stability for models of heat flux width |
| title_short | Analysis of edge stability for models of heat flux width |
| title_sort | analysis of edge stability for models of heat flux width |
| url | http://www.sciencedirect.com/science/article/pii/S2352179116302538 |
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