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Determining advection mechanism of plasma filaments in the scrape-off layer of MAST

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Higgins, D. , Hnat, B., Kirk, A., Tamain, P. and Ben Ayed, N. (2011) Determining advection mechanism of plasma filaments in the scrape-off layer of MAST. Plasma Physics and Controlled Fusion, Vol. 54 (No. 1). 015002. doi:10.1088/0741-3335/54/1/015002

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Official URL: http://dx.doi.org/10.1088/0741-3335/54/1/015002

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Abstract

The scrape-off layer (SOL) of fusion devices is typically composed of filamentary structures that propagate with a high radial velocity away from the bulk plasma. When radial and parallel transport times are comparable, these coherent structures constitute an intermittent heat and particle flux which can reach the material wall; in time causing wear to plasma facing components. Qualitative models predict that the parallel currents, driven by the divertor sheath, have a direct impact on this radial velocity. In this work, the predictions for radial velocity of plasma filaments in the SOL from models are tested against data from the MAST tokamak and simulation. We apply a statistical method of window averaging to MAST Langmuir probe data in order to examine the scaling of the radial velocity of filaments with the plasma density inside the filaments. Our analysis strongly suggests that the radial dynamics emerge from the competition of multiple mechanisms and not from a single process. At intermediate distances from the bulk plasma, a new model proposed here, in which the parallel current depends on a constant target density appears to be the most relevant for the MAST plasma. This is confirmed using a TOKAM2D simulation with a modified parallel current term.

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: 2011
Dates:
DateEvent
2011Published
Volume: Vol. 54
Number: No. 1
Page Range: 015002
DOI: 10.1088/0741-3335/54/1/015002
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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