Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak
A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L[subscript T[subscript e]][superscript -1]=|∇T[subscrip...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/78304 https://orcid.org/0000-0003-2951-9749 |
| _version_ | 1811073723960131584 |
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| author | White, Anne E. Hillesheim, J. C. DeBoo, J. C. Peebles, W. A. Carter, T. A. Wang, G. Rhodes, T. L. Schmitz, L. McKee, G. R. Yan, Z. Staebler, G. M. Burrell, K. H. Doyle, E. J. Holland, C. Petty, C. C. Smith, S. P. White, A. E. Zeng, L. |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering White, Anne E. Hillesheim, J. C. DeBoo, J. C. Peebles, W. A. Carter, T. A. Wang, G. Rhodes, T. L. Schmitz, L. McKee, G. R. Yan, Z. Staebler, G. M. Burrell, K. H. Doyle, E. J. Holland, C. Petty, C. C. Smith, S. P. White, A. E. Zeng, L. |
| author_sort | White, Anne E. |
| collection | MIT |
| description | A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L[subscript T[subscript e]][superscript -1]=|∇T[subscript e]|/T[subscript e] and toroidal rotation were varied, long wavelength (k[subscript θρs]≲0.4) electron temperature fluctuations exhibit a threshold in L[subscript T[subscript e]][superscript -1]: below, they change little; above, they steadily increase. The increase in δT[subscript e]/T[subscript e] is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T[subscript e]-driven trapped electron mode turbulence. |
| first_indexed | 2024-09-23T09:37:35Z |
| format | Article |
| id | mit-1721.1/78304 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:37:35Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/783042022-09-30T15:44:16Z Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak White, Anne E. Hillesheim, J. C. DeBoo, J. C. Peebles, W. A. Carter, T. A. Wang, G. Rhodes, T. L. Schmitz, L. McKee, G. R. Yan, Z. Staebler, G. M. Burrell, K. H. Doyle, E. J. Holland, C. Petty, C. C. Smith, S. P. White, A. E. Zeng, L. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering White, Anne E. A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L[subscript T[subscript e]][superscript -1]=|∇T[subscript e]|/T[subscript e] and toroidal rotation were varied, long wavelength (k[subscript θρs]≲0.4) electron temperature fluctuations exhibit a threshold in L[subscript T[subscript e]][superscript -1]: below, they change little; above, they steadily increase. The increase in δT[subscript e]/T[subscript e] is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T[subscript e]-driven trapped electron mode turbulence. United States. Dept. of Energy (Grant DE-FG03-01ER54615) United States. Dept. of Energy (Grant DE-FG02-08ER54984) United States. Dept. of Energy (Grant DE-FC02-04ER54698) United States. Dept. of Energy (Grant DE-FG02-95ER54309) United States. Dept. of Energy (Grant DE-FG02-89ER53296) United States. Dept. of Energy (Grant DE-FG02-08ER54999) United States. Dept. of Energy (Grant DE-FG02-06ER54871) United States. Dept. of Energy (Grant DE-FG02-07ER54917) United States. Dept. of Energy (Grant DE-FC02-93ER54186) 2013-04-09T18:56:53Z 2013-04-09T18:56:53Z 2013-01 2012-05 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/78304 Hillesheim, J. C. et al. “Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak.” Physical Review Letters 110.4 (2013). ©2013 American Physical Society https://orcid.org/0000-0003-2951-9749 en_US http://dx.doi.org/10.1103/PhysRevLett.110.045003 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | White, Anne E. Hillesheim, J. C. DeBoo, J. C. Peebles, W. A. Carter, T. A. Wang, G. Rhodes, T. L. Schmitz, L. McKee, G. R. Yan, Z. Staebler, G. M. Burrell, K. H. Doyle, E. J. Holland, C. Petty, C. C. Smith, S. P. White, A. E. Zeng, L. Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title | Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title_full | Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title_fullStr | Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title_full_unstemmed | Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title_short | Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak |
| title_sort | observation of a critical gradient threshold for electron temperature fluctuations in the diii d tokamak |
| url | http://hdl.handle.net/1721.1/78304 https://orcid.org/0000-0003-2951-9749 |
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