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First global simulations of plasma turbulence in a stellarator with an island divertor
Publications associées (240)
Global fluid simulations of plasma turbulence in stellarators
António João Caeiro Heitor Coelho
In order to cope with the decarbonization challenge faced by many countries, fusion is one of the few alternatives to fossil fuels for the production of electricity. Two devices invented in the middle of the previous century have emerged as the most promis ...
EPFL2024Global fluid simulation of plasma turbulence in stellarators with the GBS code
Paolo Ricci, Joaquim Loizu Cisquella
The implementation of three-dimensional magnetic fields, such as the ones of stellarators, in the GBS code (Ricci et al 2012 Plasma Phys. Control. Fusion54 124047; Giacomin et al 2022 J. Comput. Phys.464 111294) is presented, and simulation results are dis ...
2024Divertor turbulent transport in the single null and snowflake in the TCV tokamak
Davide Galassi, Cedric Kar-Wai Tsui, Curdin Tobias Wüthrich
The relative importance of divertor radial turbulent particle fluxes is considered by comparing it against the fluxes in the main-chamber outer midplane (OMP) in a variety of conditions and divertor geometries in the tokamak à configuration variable. Withi ...
2024Equilibrium pressure limits in stellarators
This thesis delves into the potential of magnetic fusion energy, and in particular focuses on the stellarator concept. Stellarators use external coils to produce 3-dimensional (3D) magnetic fields that confine a thermonuclear plasma in a topologically toro ...
EPFL2023An experimental and computational study of tokamak plasma turbulence
Turbulence driven by small-scale instabilities results in strong heat and particle transport, which significantly shortens the confinement time and prevents the formation of a self-sustained plasma reaction in magnetic confinement devices. Control and poss ...
EPFL2023Equilibrium β-limits dependence on bootstrap current in classical stellarators
Jonathan Graves, Joaquim Loizu Cisquella, Antoine Baillod
While it is important to design stellarators with high magnetohydrodynamic stability β-limit, it is also crucial to ensure that good magnetic surfaces exist in a large range of β values. As β increases, pressure-driven currents perturb the vacuum magnetic ...
2023Plasma turbulence simulations in a diverted tokamak with applied resonant magnetic perturbations
Paolo Ricci, Joaquim Loizu Cisquella, Théophile Boinnard, António João Caeiro Heitor Coelho
The first results of three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulations of a diverted tokamak configuration with applied resonant magnetic perturbations generated by a set of saddle coils are presented. The simulations ...
2023Occam's razor on the mechanism of resistive-wall-mode-induced beta limits in diverted tokamaks
Jonathan Graves, Daniele Brunetti
External kink modes, believed to be the drive of the 0-limiting resistive wall mode, are strongly stabilized by the presence of a separatrix. We thus propose a novel mechanism explaining the appearance of long-wavelength global instabilities in free bounda ...
2023Optimization of X-mode electron cyclotron current drive in high-electron-temperature plasma in the EAST tokamak
Joan Decker, Chunmin Zhang, Fang Liu
A discharge with electron temperature up to 14 keV has been achieved in EAST. Analysis of the electron cyclotron current drive (ECCD) efficiency at high electron temperature under EAST parameters is presented using C3PO/LUKE code. Simulation results show t ...
IOP Publishing Ltd2023Ultra long turbulent eddies, magnetic topology, and the triggering of internal transport barriers in tokamaks
Stephan Brunner, Justin Richard Ball, Arnas Volcokas
Local nonlinear gyrokinetic simulations of tokamak plasmas demonstrate that turbulent eddies can extend along magnetic field lines for hundreds of poloidal turns when the magnetic shear is very small. By accurately modeling different field line topologies ...
IOP Publishing Ltd2023