A5043867669- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Physics of Superconductivity and Magnetism
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Quantum and electron transport phenomena
École Polytechnique Fédérale de Lausanne
2022-2024
The effect of triangularity on tokamak boundary plasma turbulence is investigated by using global, flux-driven, three-dimensional, two-fluid simulations. simulations show that negative stabilizes turbulence, and linear investigations reveal this due to a reduction the magnetic curvature drive interchange instabilities, such as resistive ballooning mode. As consequence, pressure decay length $L_p$, related SOL power fall-off $\lambda_q$, found be affected triangularity. Leveraging...
Abstract Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for five-field period stellarator with an island divertor are presented. The numerical is carried out the GBS code, recently extended to simulate plasma in non-axisymmetric magnetic equilibria. vacuum field used generated theory Dommaschk potentials, and describes configuration central region nested flux surfaces, surrounded by chain islands, similar diverted configurations W7-X. heat...
Abstract The implementation of three-dimensional magnetic fields, such as the ones stellarators, in GBS code (Ricci et al 2012 Plasma Phys. Control. Fusion 54 124047; Giacomin 2022 J. Comput. 464 111294) is presented, and simulation results are discussed. geometrical operators appearing drif-reduced Braginskii equations evolved by expanded considering typical parameter ordering stellarator configurations. It turns out that most have a similar structure one implemented tokamak axisymmetric...
We present a validation of three-dimensional, two-fluid simulation plasma turbulence in the TJ-K stellarator, low temperature experiment ideally suited for measurements. The is carried out by GBS code, recently adapted to simulate 3D magnetic fields. comparison shows that retrieves main properties observed device, namely fact transport dominated fluctuations with poloidal mode number. dependence radial $\text{E}\times\text{B}$ turbulent flux compared on plane elliptical surfaces, where very...
Abstract The first results of three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulations a diverted tokamak configuration with applied resonant magnetic perturbations generated by set saddle coils are presented. an L-mode plasma show that the heat flux pattern on divertor targets is affected perturbations, as result interplay between turbulent cross field transport and parallel flows. simulation reveal potential to reduce wall. In fact, peak toroidally-...
A 0-D model for the time evolution of electron temperature T and current density j is derived (following a systematic procedure) from cylindrical 1-D heat transport diffusion equations. The stationary regimes (stable fixed points) deduced dynamical system are analysed it shown that reproduces well cases total (no sources), pure Ohmic (OH) discharge constant external heating scenario. Moreover, seen that, as fraction externally driven non-inductive applied off-axis increased, moves an OH...