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The effect of plasma triangularity on turbulent transport: modeling TCV experiments by linear and non-linear gyrokinetic simulations

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Marinoni, A., Brunner, S., Camenen, Y., Coda, S., Graves, J. P., Lapillonne, X., Pochelon, A., Sauter, O., Villard, L. and Team, T. C. V. (2009) The effect of plasma triangularity on turbulent transport: modeling TCV experiments by linear and non-linear gyrokinetic simulations. Plasma Physics and Controlled Fusion, Vol.51 (No.5). Article no. 055016. doi:10.1088/0741-3335/51/5/055016

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Official URL: http://dx.doi.org/10.1088/0741-3335/51/5/055016

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Abstract

The effect of plasma shape on confinement has been experimentally explored in the TCV tokamak revealing that the core electron heat transport is significantly reduced by a negative triangularity configuration, which could indicate a (partial) stabilization of the microinstabilities at play in a conventional positive triangularity configuration.

This work is a theoretical investigation of the effect exerted by triangularity on plasma turbulence. In particular, it compares the TCV experimental results with non-linear local gyrokinetic simulations performed on the basis of actual MHD equilibrium reconstructions.

In both the linear and non-linear phases, negative triangularity is found to have a stabilizing influence on ion-scale instabilities, specifically on the so-called trapped electron mode (TEM) which is the dominant instability in the conditions of the TCV experiments considered; more specifically, the variation of the heat flux with triangularity calculated by the non-linear simulations is in fair agreement with the experimental results.

The resulting stabilization is a result of a rather complex modification of the toroidal precessional drift of trapped particles exerted by negative triangularity.

Item Type: Journal Article
Subjects: Q Science > QC Physics
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: May 2009
Dates:
DateEvent
May 2009Published
Volume: Vol.51
Number: No.5
Number of Pages: 19
Page Range: Article no. 055016
DOI: 10.1088/0741-3335/51/5/055016
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

Data sourced from Thomson Reuters' Web of Knowledge

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