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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
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: |
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| 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 |
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