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Triangularity effects on global flux-driven gyrokinetic simulations
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Giannatale, Giovanni Di, Donnel, Peter, Villard, Laurent, Bottino, Alberto, Brunner, Stephan, Lanti, Emmanuel, McMillan, Ben F., Mishchenko, Alexey, Murugappan, Moahan and Hayward-Schneider, Thomas (2022) Triangularity effects on global flux-driven gyrokinetic simulations. In: Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas, Varenna, Italy, 11-16 Sep 2022 . Published in: Journal of Physics: Conference Series, 2397 (1). doi:10.1088/1742-6596/2397/1/012002 ISSN 1742-6596.
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Official URL: http://dx.doi.org/10.1088/1742-6596/2397/1/012002
Abstract
On the road to fusion energy production, many alternative scenarios have been investigated in order to address certain well-known problems of tokamak devices; among which, anomalous transport, ELMs and disruptions. The studies on plasma shaping fall into this effort.
In particular, it has been experimentally observed that when operating in L mode, negative triangularity (NT) features better confinement properties than positive triangularity (PT). However, even though the trend is quite clear, a complete and satisfying theoretical explanation for this experimental findings is still lacking.
With the aim of understanding and describing these improvements starting from first principles, we present the first comparison between PT and NT with global flux-driven gyrokinetic simulations performed with the ORB5 code.
The numerical setup includes: electrostatic turbulence, kinetic trapped electrons, non-linear collisional operator, ECRH source, limiter and wall as boundary conditions. The simulations have been performed on ideal MHD equilibria and kinetic profiles inspired by TCV experiments, in a mixed ITG-TEM regime.
First analysis reveal a strong reduction of transport in NT; while at the edge PT shows superdiffusivity, NT does not. The limiter plays an important role that has to be further clarified.
Item Type: | Conference Item (Paper) | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Tokamaks, Plasma (Ionized gases), Nuclear physics, Nuclear fusion, Plasma (Ionized gases) -- Turbulence | ||||
Journal or Publication Title: | Journal of Physics: Conference Series | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 1742-6596 | ||||
Official Date: | 2022 | ||||
Dates: |
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Volume: | 2397 | ||||
Number: | 1 | ||||
Article Number: | 012002 | ||||
DOI: | 10.1088/1742-6596/2397/1/012002 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 6 February 2023 | ||||
Date of first compliant Open Access: | 6 February 2023 | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas | ||||
Type of Event: | Workshop | ||||
Location of Event: | Varenna, Italy | ||||
Date(s) of Event: | 11-16 Sep 2022 |
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