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Multispecies Density and Temperature Gradient Dependence of Quasilinear Particle and Energy Fluxes.

DE2004828597

Publication Date	2004
Personal Author	Rewoldt, G.; Budny, R. V.; Tang, W. M.
Page Count	32
Abstract	The variations of the normalized quasilinear particle and energy fluxes with artificial changes in the density and temperature gradients, as well as the variations of the linear growth rates and real frequencies, for ion temperature gradient and trapped-electron modes, are calculated. The quasilinear fluxes are normalized to the total energy flux, summed over all species. Here, realistic cases for tokamaks and spherical torii are considered which have two impurity species. For situations where there are substantial changes in the normalized fluxes, the 'diffusive approximation,' in which the normalized fluxes are taken to be linear in the gradients, is seen to be inaccurate. Even in the case of small artificial changes in density or temperature gradients, changes in the fluxes of different species ('off-diagonal') generally are significant, or even dominant, compared to those for the same species ('diagonal').
Keywords	Particle interactions Temperature gradients Ion temperature Electron density Tokamak devices Plasma microinstabilities Flux density
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200513

Multispecies Density and Temperature Gradient Dependence of Quasilinear Particle and Energy Fluxes.

Multispecies Density and Temperature Gradient Dependence of Quasilinear Particle and Energy Fluxes.
DE2004828597

Publication Date	2004
Personal Author	Rewoldt, G.; Budny, R. V.; Tang, W. M.
Page Count	32
Abstract	The variations of the normalized quasilinear particle and energy fluxes with artificial changes in the density and temperature gradients, as well as the variations of the linear growth rates and real frequencies, for ion temperature gradient and trapped-electron modes, are calculated. The quasilinear fluxes are normalized to the total energy flux, summed over all species. Here, realistic cases for tokamaks and spherical torii are considered which have two impurity species. For situations where there are substantial changes in the normalized fluxes, the 'diffusive approximation,' in which the normalized fluxes are taken to be linear in the gradients, is seen to be inaccurate. Even in the case of small artificial changes in density or temperature gradients, changes in the fluxes of different species ('off-diagonal') generally are significant, or even dominant, compared to those for the same species ('diagonal').
Keywords	Particle interactions Temperature gradients Ion temperature Electron density Tokamak devices Plasma microinstabilities Flux density
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200513