Effect of triangularity on plasma turbulence and the SOL-width scaling in L-mode diverted tokamak configurations

被引：7
|
作者：
Lim, K. [1 ]
Giacomin, M. [2 ]
Ricci, P. [1 ]
Coelho, A. [1 ]
Fevrier, O. [1 ]
Mancini, D. [1 ]
Silvagni, D. [3 ]
Stenger, L. [1 ]
机构：
[1] Ecole Polytech Fed Lausanne EPFL, Swiss Plasma Ctr, SB, SPC, Stn 13, CH-1015 Lausanne, Switzerland
[2] Univ York, York Plasma Inst, York YO10 5DD, England
[3] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2023年 / 65卷 / 08期
关键词：
negative triangularity; edge plasma turbulence; SOL width scaling; ENERGY CONFINEMENT; POWER; MAST; JET;
D O I：
10.1088/1361-6587/acdc52
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The effect of triangularity on tokamak boundary plasma turbulence is investigated using global, flux-driven, three-dimensional, two-fluid simulations. The simulations show that negative triangularity (NT) stabilizes boundary plasma turbulence, and linear investigations reveal that this is due to a reduction of the magnetic curvature driven by interchange instabilities, such as the resistive ballooning mode (RBM). As a consequence, the pressure decay length L ( p ), related to the scrape-off layer (SOL) power fall-off length lambda ( q ), is found to be affected by triangularity. Leveraging considerations on the effect of triangularity on the linear growth rate and nonlinear evolution of the RBM, the analytical theory-based scaling law for L ( p ) in L-mode plasmas, derived by Giacomin et al (2021 Nucl. Fusion 61 076002), is extended to include the effect of triangularity. The scaling is in agreement with nonlinear simulations and a multi-machine experimental database, which includes recent TCV discharges dedicated to the study of the effect of triangularity in L-mode diverted discharges. Overall, the present results highlight that NT narrows the L ( p ) and considering the effect of triangularity is important for a reliable extrapolation of lambda ( q ) from present experiments to larger devices.
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页数：17
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