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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 ISSN 0741-3335.

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Official URL: http://dx.doi.org/10.1088/0741-3335/56/3/035012

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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, Engineering and Medicine > Science > Physics
Journal or Publication Title: Plasma Physics and Controlled Fusion
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0741-3335
Official Date: 2014
Dates:
DateEvent
2014Published
18 February 2014Available
27 January 2014Accepted
22 November 2013Submitted
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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