Turbulent transport studies in alcator C-Mod ohmic plasmas

M. Porkolab, J. Dorris, P. Ennever, C. Fiore, A. Hubbard, M. Greenwald, Y. Ma, Y. Podpaly, M. L. Reinke, J. Rice, J. C. Rost, N. Tsujii, J. Candy, G. M. Staebler, R. Waltz, P. Diamond

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Extensive gyrokinetic studies of low density ohmic plasmas in Alcator C-Mod revealed the important role of deuterium depletion in the presence of a second (impurity) ion species with moderate Zi, resulting in reduced ion transport and dominant electron transport in the outer half of the plasma column. Additional examination of linear growth rates is in agreement with this observation. The radial electric field shear does not play a dominant role in the stability of these plasmas. Transport in the inner half of the plasma core is not explained by the gyrokinetic codes. Potential physical mechanisms to give the enhanced transport in the plasma core include mild sawteeth (although the inversion radius is typically r/a < 0.35), or drift waves driven by ohmic electron drift which at the lowest densities considered here can attain values as high as U/Cs = 6 near the center, and diminish radially in accordance with the electron temperature profile [4].

Original languageEnglish
Title of host publication38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts
Pages1724-1727
Number of pages4
StatePublished - 2011
Externally publishedYes
Event38th EPS Conference on Plasma Physics 2011, EPS 2011 - Strasbourg, France
Duration: Jun 27 2011Jul 1 2011

Publication series

Name38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts
Volume35 2

Conference

Conference38th EPS Conference on Plasma Physics 2011, EPS 2011
Country/TerritoryFrance
CityStrasbourg
Period06/27/1107/1/11

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