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Blob dynamics in an inhomogeneous plasma

Phys. Plasmas 15, 102304 (2008); doi:10.1063/1.2993211

Published 8 October 2008

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K. Bodi,1 S. I. Krasheninnikov,1 and A. I. Smolyakov2
1Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, California 92093-0411, USA
2Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Convective blob propagation in the scrape-off-layer and/or limiter shadow region is analyzed analytically and numerically with emphasis on effects of a gradient in the equilibrium plasma density. The gradient of the equilibrium plasma density is taken into account beyond the Boussineque approximation. It is shown that the vorticity modification due to the plasma density gradient leads to the acceleration for the blobs propagating into the region of lower density and de-acceleration for the blobs propagating toward the regions of higher density. Analytical estimates are corroborated by direct numerical simulations. ©2008 American Institute of Physics
History: Received 1 August 2008; accepted 11 September 2008; published 8 October 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/102304/1
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1070-664X (print)   1089-7674 (online)
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