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Development of statistical analysis tools for global observable of fluctuation data towards optimised real-time control applications
Related publications (146)
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 ...
EPFL2024Re-design of EU DEMO with a low aspect ratio
The design point that had been chosen for EU DEMO in 2016 is reviewed here and a modification is proposed with a lower aspect ratio. Previously the same aspect ratio, A, was chosen for EU DEMO as in major tokamak experiments including ITER (A = 3.1), and, ...
2024Shedding light on the MRI-driven dynamo in a stratified shearing box
We study the magneto-rotational instability (MRI) dynamo in a geometrically thin disc (H/R < 1) using stratified zero net (vertical) flux shearing box simulations. We find that mean fields and electromotive forces (EMFs) oscillate with a primary frequency ...
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 ...
EPFL2023Full-discharge simulation and optimization with the RAPTOR code, from present tokamaks to ITER and DEMO
Tokamak devices aim to magnetically confine a hydrogen plasma at sufficiently high pressure to achieve net energy production from nuclear fusion of light isotopes. Predictive modeling and optimization is crucial for reliable operation of tokamak reactors, ...
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 ...
EPFL2023Shafranov shift correction to the Furth-Yoshikawa scaling of tokamak adiabatic compression
In 1970, Furth and Yoshikawa (1970 Phys. Fluids 13 2593-6) introduced the scalings of adiabatic plasma compression. Basically, if the shape of the external plasma boundary and the aspect ratio are preserved during the compression, then the density, kinetic ...
IOP Publishing Ltd2023How accurate are flux-tube (local) gyrokinetic codes in modeling energetic particle effects on core turbulence?
Olivier Sauter, Alberto Bottino, Emanuele Poli
Flux-tube (local) gyrokinetic codes are widely used to simulate drift-wave turbulence in magnetic confinement devices. While a large number of studies show that flux-tube codes provide an excellent approximation for turbulent transport in medium-large devi ...
IOP Publishing Ltd2023Excitation of toroidal Alfvén eigenmodes with counter-current NBI in the TCV tokamak
Laurie Porte, Alexander Karpushov, Matteo Vallar, Samuele Mazzi
In TCV, unstable modes excited by resonant interaction between the shear Alfvèn waves in con- tinuum gaps and energetic particles have been observed in scenarios with Neutral Beam Injection (NBI). TCV is a middle-size device (R 0 /a = 0.88/0.25) equipped w ...
2023Solar Wind Protons in the Diamagnetic Cavity at Comet 67P/Churyumov-Gerasimenko
The plasma environment at a comet can be divided into different regions with distinct plasma characteristics. Two such regions are the solar wind ion cavity, which refers to the part of the outer coma that does not contain any solar wind ions anymore; and ...
AMER GEOPHYSICAL UNION2023