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Plasma blob formation by ion kinetic Kelvin–Helmholtz and interchange instabilities
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Gingell, Peter W., Chapman, Sandra C. and Dendy, R. O. (2014) Plasma blob formation by ion kinetic Kelvin–Helmholtz and interchange instabilities. Plasma Physics and Controlled Fusion, Volume 56 (Number 3). Article number 035012. doi:10.1088/0741-3335/56/3/035012
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Official URL: http://dx.doi.org/10.1088/0741-3335/56/3/035012
Abstract
The near-edge region of a tokamak is observed to generate radially propagating, coherent filamentary structures ('blobs'), which transport particles and heat from the confined region and across the scrape-off layer. The distribution of blob sizes may include a currently unresolvable population with radii comparable to the ion gyro-radius. Here, we conduct large-scale numerical simulations to study mechanisms for the creation of ion gyro-scale blobs via the ion kinetic Kelvin–Helmholtz and interchange instabilities, using a hybrid (kinetic ion, fluid electron) model. We present statistics of the sizes of blobs created by these instabilities, and radial particle displacement data. We find that ion gyro-scale blobs constitute a significant portion of the blob population, and that an increase in ion gyro-radius results in an increase in radial transport. Results are contrasted for pure proton plasmas and for 50 : 50 deuterium–tritium mix, relevant to burning plasmas. We conclude that ion kinetic physics plays a significant role in the transport of energy and particles by ion gyro-scale blobs in the near-edge region of low-field tokamaks.
| 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: | 2014 | ||||||||||
| Dates: |
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| Volume: | Volume 56 | ||||||||||
| Number: | Number 3 | ||||||||||
| Article Number: | Article number 035012 | ||||||||||
| DOI: | 10.1088/0741-3335/56/3/035012 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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