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Transport and evolution of ion gyro-scale plasma blobs in perpendicular magnetic fields
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Gingell, Peter W., Chapman, Sandra C., Dendy, R. O. and Brady, Christopher S. (2012) Transport and evolution of ion gyro-scale plasma blobs in perpendicular magnetic fields. Plasma Physics and Controlled Fusion, Volume 54 (Number 6). Article number 065005. doi:10.1088/0741-3335/54/6/065005
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Official URL: http://dx.doi.org/10.1088/0741-3335/54/6/065005
Abstract
Strongly localized concentrations or depressions of plasma density and magnetic field strength ('blobs') are ubiquitous in the edge region of tokamak fusion experiments. The existing fusion plasma literature in this area focuses primarily on blobs sufficiently large that a fluid description is appropriate. However, the blob population may include some—not necessarily easily detectable—whose characteristic lengthscales are on the order of the ion gyro-scales. This implies that a description at the fluid level is unlikely to capture the full dynamics. Here, therefore, we report hybrid (particle ions, fluid electrons) simulations of ion gyro-scale blobs, which enable us to examine the effects of finite Larmor radius on their dynamics and evolution. We find that ion gyro-scale blobs are advected with the background flow, and develop a twin-celled vortex structure. Asymmetry then arises from finite ion Larmor radius kinetics, manifesting in the size of the internal vortices, the shape of tails forming from blob ejecta, and the growth of a Kelvin–Helmholtz instability.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0741-3335 | ||||
| Official Date: | 2012 | ||||
| Dates: |
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| Volume: | Volume 54 | ||||
| Number: | Number 6 | ||||
| Page Range: | Article number 065005 | ||||
| DOI: | 10.1088/0741-3335/54/6/065005 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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