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- W1569294518 abstract "Measurements of test-particle diffusion in pure ion plasmas show 2D enhancements over the 3D rates, limited by shear in the plasma rotation ωE(r). The diffusion is due to “long-range” ion-ion collisions in the quiescent, steady-state Mg+ plasma. For short plasma length Lp and low shear S≡r∂ωE/∂r, thermal ions bounce axially many times before shear separates them in θ, so the ions move in (r,θ) as bounce averaged “rods” of charge (i.e. 2D point vortices). Experimentally, we vary the number of bounces over the range 0.2⩽Nb⩽10,000. For long plasmas with Nb⩽1, we observe diffusion in quantitative agreement with the 3D theory of long-range E×B drift collisions. For shorter plasmas or lower shear, with Nb>1, we measure diffusion rates enhanced by up to 100×. For exceedingly small she0ar, i.e. Nb⩾1000, we observe diffusion rates consistent with the Taylor-McNamara estimates for a shear-free thermal plasma. Overall, the data shows fair agreement with Dubin’s new theory of 2D diffusion in shear, which predicts an ..." @default.
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- W1569294518 date "2002-01-01" @default.
- W1569294518 modified "2023-09-25" @default.
- W1569294518 title "Shear-limited test particle diffusion in 2-dimensional plasmas" @default.
- W1569294518 doi "https://doi.org/10.1063/1.1454310" @default.
- W1569294518 hasPublicationYear "2002" @default.
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