Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement
The mitigation of divertor heat fluxes is an active topic of investigation on existing tokamaks. One approach uses radiation, both inside and outside the last closed flux surface (LCFS), to convert plasma thermal energy, usually directed towards dedicated plasma facing components, to soft X-ray and...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2016
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| Online Access: | http://hdl.handle.net/1721.1/103967 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
| _version_ | 1811093381835653120 |
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| author | Reinke, Matthew Logan Hughes, John F. Loarte, A. Brunner, Daniel Frederic Labombard, Brian Payne, Joshua E. Hutchinson, Ian Horner Terry, James L |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Reinke, Matthew Logan Hughes, John F. Loarte, A. Brunner, Daniel Frederic Labombard, Brian Payne, Joshua E. Hutchinson, Ian Horner Terry, James L |
| author_sort | Reinke, Matthew Logan |
| collection | MIT |
| description | The mitigation of divertor heat fluxes is an active topic of investigation on existing tokamaks. One approach uses radiation, both inside and outside the last closed flux surface (LCFS), to convert plasma thermal energy, usually directed towards dedicated plasma facing components, to soft X-ray and ultraviolet radiation, spread over a much larger surface area. Recent enhanced D-α H-mode experiments on Alcator C-Mod varied the ICRF input power and radiative power losses via impurity seeding to demonstrate that normalized energy confinement depends strongly on the difference between input power and the radiated power inside the LCFS. These investigations also show that when seeded with either Ne or N2, a factor of two and higher reduction in outer divertor heat flux is achieved while maintaining H[subscript 98,y2] ∼ 1.0. Conversely, when seeding with Ar, confinement is limited to H[subscript 98,y2] ∼ 0.8 for a similar level of exhaust power. |
| first_indexed | 2024-09-23T15:44:21Z |
| format | Article |
| id | mit-1721.1/103967 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:44:21Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1039672022-10-02T03:48:40Z Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement Reinke, Matthew Logan Hughes, John F. Loarte, A. Brunner, Daniel Frederic Labombard, Brian Payne, Joshua E. Hutchinson, Ian Horner Terry, James L Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center MIT Kavli Institute for Astrophysics and Space Research Hutchinson, Ian H. Reinke, Matthew Logan Hughes, John F. Brunner, Daniel Frederic Hutchinson, Ian H. Labombard, Brian Payne, Joshua E. Terry, James L. The mitigation of divertor heat fluxes is an active topic of investigation on existing tokamaks. One approach uses radiation, both inside and outside the last closed flux surface (LCFS), to convert plasma thermal energy, usually directed towards dedicated plasma facing components, to soft X-ray and ultraviolet radiation, spread over a much larger surface area. Recent enhanced D-α H-mode experiments on Alcator C-Mod varied the ICRF input power and radiative power losses via impurity seeding to demonstrate that normalized energy confinement depends strongly on the difference between input power and the radiated power inside the LCFS. These investigations also show that when seeded with either Ne or N2, a factor of two and higher reduction in outer divertor heat flux is achieved while maintaining H[subscript 98,y2] ∼ 1.0. Conversely, when seeding with Ar, confinement is limited to H[subscript 98,y2] ∼ 0.8 for a similar level of exhaust power. United States. Dept. of Energy (DOE Contract Number DEFC0299ER54512) 2016-08-24T19:30:31Z 2016-08-24T19:30:31Z 2011-01 Article http://purl.org/eprint/type/JournalArticle 00223115 http://hdl.handle.net/1721.1/103967 Reinke, M.L., J.W. Hughes, A. Loarte, D. Brunner, I.H. Hutchinson, B. LaBombard, J. Payne, and J.L. Terry. “Effect of N2, Ne and Ar Seeding on Alcator C-Mod H-Mode Confinement.” Journal of Nuclear Materials 415, no. 1 (August 2011): S340–S344. https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 en_US http://dx.doi.org/10.1016/j.jnucmat.2010.10.055 Journal of Nuclear Materials Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Prof. Hutchinson via Chris Sherratt |
| spellingShingle | Reinke, Matthew Logan Hughes, John F. Loarte, A. Brunner, Daniel Frederic Labombard, Brian Payne, Joshua E. Hutchinson, Ian Horner Terry, James L Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title | Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title_full | Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title_fullStr | Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title_full_unstemmed | Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title_short | Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement |
| title_sort | effect of n subscript 2 ne and ar seeding on alcator c mod h mode confinement |
| url | http://hdl.handle.net/1721.1/103967 https://orcid.org/0000-0002-8753-1124 https://orcid.org/0000-0002-7841-9261 |
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