Shear reduction of collisional transport: Experiments and theory

C. F. Driscoll, F. Anderegg, D. H.E. Dubin, D. Z. Jin, J. M. Kriesel, E. M. Hollmann, T. M. O'Neil

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Abstract

Experiments and theory on collisional diffusion and viscosity in quiescent single-species plasmas demonstrate enhanced transport in the two-dimensional (2D) bounce-averaged regime, limited by shear in the plasma rotation. For long plasma columns, the measured diffusion agrees quantitatively with recent theories of three-dimensional long-range E×B drift collisions, and is substantially larger than predicted for classical velocity-scattering collisions. For short plasmas, diffusion is observed to be enhanced by N b, the number of times a thermal particle bounces axially before being separated by shear. Equivalently, recent theory in the 2D bounce-averaged regime shows how diffusion decreases with increasing shear, generalizing the zero-shear perspective which gives Bohm diffusion. Viscosity is similarly enhanced in the 2D regime, but there is presently only qualitative agreement with theory. These results apply to both non-neutral and neutral plasmas, and provide the first rigorous analysis of shear reduction of transport in a paradigmatic system.

Original languageEnglish (US)
Pages (from-to)1905-1914
Number of pages10
JournalPhysics of Plasmas
Volume9
Issue number5
DOIs
StatePublished - May 1 2002

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Driscoll, C. F., Anderegg, F., Dubin, D. H. E., Jin, D. Z., Kriesel, J. M., Hollmann, E. M., & O'Neil, T. M. (2002). Shear reduction of collisional transport: Experiments and theory. Physics of Plasmas, 9(5), 1905-1914. https://doi.org/10.1063/1.1454998