Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions
A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent L-mode state ill...
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| creator | I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan |
| description | A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent L-mode state illuminate the source of the long known but as yet unexplained “favorable-unfavorable” geometric asymmetry of the power threshold for transition to the turbulence-suppressed H mode. Results from the recently discovered I mode point to a competition between zonal flow (ZF) and geodesic-acoustic modes (GAM) for turbulent energy, while showing new evidence that the I-to-H transition is still dominated by ZFs. The availability of nonlinear drive for the GAM against net heat flux through the edge corresponds very well to empirical scalings found experimentally for accessing the I mode. |
| doi_str_mv | 10.7910/dvn/wt1xgr |
| format | Dataset |
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The availability of nonlinear drive for the GAM against net heat flux through the edge corresponds very well to empirical scalings found experimentally for accessing the I mode.</description><subject>confinement</subject><subject>edge transport barrier</subject><subject>edge turbulence</subject><subject>H-modes</subject><subject>I-mode</subject><subject>nonlinear effects</subject><subject>Physics</subject><fulltext>true</fulltext><rsrctype>dataset</rsrctype><creationdate>2018</creationdate><recordtype>dataset</recordtype><sourceid>PQ8</sourceid><recordid>eNotjz1PwzAURb0woMLCL_CMFOqPtEnHKoKCFNGBzETPfi-t1cRGjgvk35Oq6A73LvdIh7EHKZ6KjRRL_PbLnyR_D_GWfTbnaM49eUv8PfjeeYLokqORfxwJee0Ox8SD5zsKA6XoLN-O03CZE3eeN-EEA5x4FXw3fwfyiTcR_Dgzgh_v2E0H_Uj3_71gzctzU71m9X73Vm3rDAsZs9JqMqrLJXW5FSsjpDJzEHVRgkGZAyhJWquNRLFWK1gb1AplZ6xVJQq9YI9XLEIC6xK1X9ENEKdWivbi3M7O7dVZ_wG6zVSF</recordid><startdate>2018</startdate><enddate>2018</enddate><creator>I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan</creator><general>Harvard Dataverse</general><scope>DYCCY</scope><scope>PQ8</scope></search><sort><creationdate>2018</creationdate><title>Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions</title></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-d71r-8c3eb2f41ef4c05b012b2b2dd378abd14aa21e33291d0625a6bd32d1fbcc28d03</frbrgroupid><rsrctype>datasets</rsrctype><prefilter>datasets</prefilter><language>eng</language><creationdate>2018</creationdate><topic>confinement</topic><topic>edge transport barrier</topic><topic>edge turbulence</topic><topic>H-modes</topic><topic>I-mode</topic><topic>nonlinear effects</topic><topic>Physics</topic><toplevel>online_resources</toplevel><creatorcontrib>I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan</creatorcontrib><collection>DataCite (Open Access)</collection><collection>DataCite</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><aucorp>I. Cziegler, A. E. Hubbard, J.W. Hughes, J. L. Terry, G. R. Tynan</aucorp><format>book</format><genre>unknown</genre><ristype>DATA</ristype><title>Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions</title><date>2018</date><risdate>2018</risdate><abstract>A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent L-mode state illuminate the source of the long known but as yet unexplained “favorable-unfavorable” geometric asymmetry of the power threshold for transition to the turbulence-suppressed H mode. Results from the recently discovered I mode point to a competition between zonal flow (ZF) and geodesic-acoustic modes (GAM) for turbulent energy, while showing new evidence that the I-to-H transition is still dominated by ZFs. The availability of nonlinear drive for the GAM against net heat flux through the edge corresponds very well to empirical scalings found experimentally for accessing the I mode.</abstract><pub>Harvard Dataverse</pub><doi>10.7910/dvn/wt1xgr</doi><oa>free_for_read</oa></addata></record> |
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| identifier | DOI: 10.7910/dvn/wt1xgr |
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| language | eng |
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| subjects | confinement edge transport barrier edge turbulence H-modes I-mode nonlinear effects Physics |
| title | Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions |
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