Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas
Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear...
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| Materialtyp: | Artikel |
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American Institute of Physics (AIP)
2013
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| Länkar: | http://hdl.handle.net/1721.1/80275 https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-0026-6939 |
| _version_ | 1826215822934147072 |
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| author | Podpaly, Y. A. Diamond, P. H. Ma, Y. Cziegler, Istvan Duval, B. P. Gao, Chi Rice, John E. Greenwald, Martin J. Reinke, Matthew Logan Hughes, Jerry W. Howard, Nathaniel Thomas Ennever, Paul Chappell Ernst, Darin R. Fiore, Catherine L. Irby, James Henderson Marmar, Earl S. Porkolab, Miklos Tsujii, Naoto Wolfe, Stephen M. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Podpaly, Y. A. Diamond, P. H. Ma, Y. Cziegler, Istvan Duval, B. P. Gao, Chi Rice, John E. Greenwald, Martin J. Reinke, Matthew Logan Hughes, Jerry W. Howard, Nathaniel Thomas Ennever, Paul Chappell Ernst, Darin R. Fiore, Catherine L. Irby, James Henderson Marmar, Earl S. Porkolab, Miklos Tsujii, Naoto Wolfe, Stephen M. |
| author_sort | Podpaly, Y. A. |
| collection | MIT |
| description | Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality. |
| first_indexed | 2024-09-23T16:37:38Z |
| format | Article |
| id | mit-1721.1/80275 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:37:38Z |
| publishDate | 2013 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/802752022-09-29T20:25:20Z Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas Podpaly, Y. A. Diamond, P. H. Ma, Y. Cziegler, Istvan Duval, B. P. Gao, Chi Rice, John E. Greenwald, Martin J. Reinke, Matthew Logan Hughes, Jerry W. Howard, Nathaniel Thomas Ennever, Paul Chappell Ernst, Darin R. Fiore, Catherine L. Irby, James Henderson Marmar, Earl S. Porkolab, Miklos Tsujii, Naoto Wolfe, Stephen M. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Porkolab, Miklos Rice, John E. Greenwald, Martin J. Podpaly, Y. A. Reinke, Matthew Logan Hughes, Jerry W. Howard, Nathaniel Thomas Ma, Y. Cziegler, Istvan Ennever, Paul Chappell Ernst, Darin R. Fiore, Catherine L. Gao, Chi Irby, James Henderson Marmar, Earl S. Porkolab, Miklos Tsujii, Naoto Wolfe, Stephen M. Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality. United States. Dept. of Energy (Contract DE-FC02-99ER54512) 2013-08-26T19:03:56Z 2013-08-26T19:03:56Z 2012-03 2011-11 Article http://purl.org/eprint/type/JournalArticle 1070664X 1089-7674 http://hdl.handle.net/1721.1/80275 Rice, J. E., M. J. Greenwald, Y. A. Podpaly, M. L. Reinke, P. H. Diamond, J. W. Hughes, N. T. Howard, et al. “Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas.” Physics of Plasmas 19, no. 5 (2012): 056106. https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-0026-6939 en_US http://dx.doi.org/10.1063/1.3695213 Physics of Plasmas Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf American Institute of Physics (AIP) Prof. Porkolab via Chris Sherratt |
| spellingShingle | Podpaly, Y. A. Diamond, P. H. Ma, Y. Cziegler, Istvan Duval, B. P. Gao, Chi Rice, John E. Greenwald, Martin J. Reinke, Matthew Logan Hughes, Jerry W. Howard, Nathaniel Thomas Ennever, Paul Chappell Ernst, Darin R. Fiore, Catherine L. Irby, James Henderson Marmar, Earl S. Porkolab, Miklos Tsujii, Naoto Wolfe, Stephen M. Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title_full | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title_fullStr | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title_full_unstemmed | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title_short | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
| title_sort | ohmic energy confinement saturation and core toroidal rotation reversal in alcator c mod plasmas |
| url | http://hdl.handle.net/1721.1/80275 https://orcid.org/0000-0003-3234-8733 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0002-9604-204X https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0002-0026-6939 |
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