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Anomalous parallel momentum transport due to E x B flow shear in a tokamak plasma
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Casson, F. J. (Francis James), Peeters, A. G., Camenen, Y., Hornsby, W. A., Snodin, A. P., Strintzi, D. and Szepesi, Gabor (2009) Anomalous parallel momentum transport due to E x B flow shear in a tokamak plasma. Physics of Plasmas, Vol.16 (No.9). Article no.092303. doi:10.1063/1.3227650 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.3227650
Abstract
Nondiffusive anomalous momentum transport in toroidal plasmas occurs through symmetry breaking mechanisms. In this paper the contribution of sheared E X B flows to parallel momentum transport [R. R. Dominguez and G. M. Staebler, Phys Fluids B 5, 3876 (1993)] is investigated with nonlinear gyrokinetic simulations in toroidal geometry. The background perpendicular shear is treated independently from the parallel velocity shear to isolate a nondiffusive, nonpinch contribution to the parallel momentum flux. It is found that the size of the term depends strongly on the magnetic shear, with the sign reversing for negative magnetic shear. Perpendicular shear flows are responsible for both symmetry breaking and suppression of turbulence, resulting in a shearing rate at which there is a maximum contribution to the momentum transport. The E X B momentum transport is shown to be quenched by increasing flow shear more strongly than the standard linear quench rule for turbulent heat diffusivity. (C) 2009 American Institute of Physics. [doi:10.1063/1.3227650]
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | September 2009 | ||||
| Dates: |
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| Volume: | Vol.16 | ||||
| Number: | No.9 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | Article no.092303 | ||||
| DOI: | 10.1063/1.3227650 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) |
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