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The effects of nonuniform magnetic field strength on density flux and test particle transport in drift wave turbulence
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Dewhurst, J. M., Hnat, B. and Dendy, R. O. (2009) The effects of nonuniform magnetic field strength on density flux and test particle transport in drift wave turbulence. Physics of Plasmas, Vol.16 (No.7). Article no. 072306. doi:10.1063/1.3177382
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Official URL: http://dx.doi.org/10.1063/1.3177382
Abstract
The extended Hasegawa-Wakatani equations generate fully nonlinear self-consistent solutions for coupled density n and vorticity del(2)phi, where phi is electrostatic potential, in a plasma with background density inhomogeneity kappa=-partial derivative ln n(0)/partial derivative x and magnetic field strength inhomogeneity C=-partial derivative ln B/partial derivative x. Finite C introduces interchange effects and del B drifts into the framework of drift turbulence through compressibility of the ExB and diamagnetic drifts. This paper addresses the direct computation of the radial ExB density flux Gamma(n)=-n partial derivative phi/partial derivative y, tracer particle transport, the statistical properties of the turbulent fluctuations that drive Gamma(n) and tracer motion, and analytical underpinnings. Systematic trends emerge in the dependence on C of the skewness of the distribution of pointwise Gamma(n) and in the relative phase of density-velocity and density-potential pairings. It is shown how these effects, together with conservation of potential vorticity Pi=del(2)phi-n+(kappa-C)x, account for much of the transport phenomenology. Simple analytical arguments yield a Fickian relation Gamma(n)=(kappa-C)D-x between the radial density flux Gamma(n) and the radial tracer diffusivity D-x, which is shown to explain key trends in the simulations.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | July 2009 | ||||
| Dates: |
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| Volume: | Vol.16 | ||||
| Number: | No.7 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | Article no. 072306 | ||||
| DOI: | 10.1063/1.3177382 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Euratom, EPSRC CASE |
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