Effects of Plasma Shaping on Nonlinear Gyrokinetic Turbulence

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The effects of flux surface shape on the gyrokinetic stability and transport of tokamak plasmas are studied using the GS2 code [M. Kotschenreuther, G. Rewoldt, and W.M. Tang, Comput. Phys. Commun. 88, 128 (1995); W. Dorland, F. Jenko, M. Kotschenreuther, and B.N. Rogers, Phys. Rev. Lett. 85, 5579 (2000)]. Studies of the scaling of nonlinear turbulence with shaping parameters are performed using analytic equilibria based on interpolations of representative shapes of the Joint European Torus (JET) [P.H. Rebut and B.E. Keen, Fusion Technol. 11, 13 (1987)]. High shaping is found to be a stabilizing influence on both the linear ion-temperature-gradient ... continued below

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E.A. Belli, G.W. Hammett and W. Dorland August 19, 2008.

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The effects of flux surface shape on the gyrokinetic stability and transport of tokamak plasmas are studied using the GS2 code [M. Kotschenreuther, G. Rewoldt, and W.M. Tang, Comput. Phys. Commun. 88, 128 (1995); W. Dorland, F. Jenko, M. Kotschenreuther, and B.N. Rogers, Phys. Rev. Lett. 85, 5579 (2000)]. Studies of the scaling of nonlinear turbulence with shaping parameters are performed using analytic equilibria based on interpolations of representative shapes of the Joint European Torus (JET) [P.H. Rebut and B.E. Keen, Fusion Technol. 11, 13 (1987)]. High shaping is found to be a stabilizing influence on both the linear ion-temperature-gradient (ITG) instability and the nonlinear ITG turbulence. For the parameter regime studied here, a scaling of the heat flux with elongation of χ ∼ ℵ-1.5 or ℵ-2.0, depending on the triangularity, is observed at fixed average temperature gradient. While this is not as strong as empirical elongation scalings, it is also found that high shaping results in a larger Dimits upshift of the nonlinear critical temperature gradient due to an enhancement of the Rosenbluth-Hinton residual zonal flows.

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  • Report No.: PPPL-4342
  • Grant Number: DE-AC02-76CHO3073
  • DOI: 10.2172/939431 | External Link
  • Office of Scientific & Technical Information Report Number: 939431
  • Archival Resource Key: ark:/67531/metadc899329

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  • August 19, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 18, 2016, 10 p.m.

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E.A. Belli, G.W. Hammett and W. Dorland. Effects of Plasma Shaping on Nonlinear Gyrokinetic Turbulence, report, August 19, 2008; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc899329/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.