A5011899604- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Particle accelerators and beam dynamics
- Fluid Dynamics and Turbulent Flows
- Parallel Computing and Optimization Techniques
- Advanced Data Storage Technologies
- Granular flow and fluidized beds
- Radiation Effects in Electronics
- Computational Fluid Dynamics and Aerodynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Atmospheric and Environmental Gas Dynamics
- Gas Dynamics and Kinetic Theory
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Physics of Superconductivity and Magnetism
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2021-2024
CEA Cadarache
2021-2024
Institut de Recherche sur la Fusion par Confinement Magnétique
2023-2024
CEA Grenoble
2021
Japan Atomic Energy Agency
2021
Kyoto University
2015-2017
Culham Science Centre
2012
Culham Centre for Fusion Energy
2012
Abstract We utilize the global full-F gyrokinetic code GYSELA to analyze nonlocal transport in presence of modulated heat source, period which is range a timescale. In submarginal stable case, it observed that localized and time-modulated source can trigger both diffusive avalanche-like transport. When source-stimulated occurs, propagation turbulence faster than pulse. addition, speed correlated with intensity source. This correlation also identified from analytic expression derived...
The new JET ITER-like wall (made of beryllium and tungsten) is more fragile than the former carbon fiber composite requires active protection to prevent excessive heat loads on plasma facing components (PFC). Analog CCD cameras operating in near infrared wavelength are used measure surface temperature PFCs. Region interest (ROI) analysis performed real time maximum measured each ROI sent vessel thermal map. system started October 2011 has already successfully led a safe landing when hot...
Abstract Reynolds stress is a key facet of turbulence self-organization. In the magnetized plasmas controlled fusion devices, zonal flows that are driven by averaged modify confinement performance. We address this problem with full- f gyrokinetic simulations ion temperature gradient-driven turbulence. From detailed analysis three-dimensional electric potential and transverse pressure fields, we show diamagnetic contribution to stress—stemming from finite Larmor radius effects—exceeds...
Abstract A reduced model for trapped electron mode stability has been developed, which incorporates the basic effects of magnetic surface shaping, in particular, elongation and triangularity. This shows that while is stabilising, though weakly, negative triangularity usually leads to a more unstable plasma. marked contrast with experimental evidence better confinement at triangularity, recent gyrokinetic linear simulations. paradox solved when finite orbit and/or extent along field lines...
This work introduces a new full-f toroidal gyrokinetic (GK) Vlasov simulation code that uses real space field solver. solver enables us to compute the gyro-averaging operators in allow proper treatment of finite Larmor radius (FLR) effects without requiring any particular hypothesis and magnetic configuration (X-point, D-shaped etc). The was well verified through benchmark tests such as Ion Temperature Gradient (ITG) instability collisionless damping zonal flow.
Tracer impurity transport in ion temperature gradient-driven (ITG) turbulence is investigated using a global full-f gyrokinetic simulation including kinetic electrons, bulk ions, and low to medium Z tracer impurities, where the charge number. It found that addition turbulent particle transport, enhanced neoclassical due new synergy effect between transports makes significant contribution transport. Bursty excitation of ITG mode generates non-ambipolar fluxes electrons leading fast growth...
Abstract Impurity transport is numerically investigated for different types of impurity, such as helium (He), argon (Ar), and tungsten (W). Both turbulent neoclassical transports are treated self-consistently using the full- f gyrokinetic software GYSELA. For a light impurity mainly controlled by turbulence, while found to be dominant in case heavy The impact poloidal asymmetry density also studied detail it strong high charge due its Boltzmann-type response. Such might lead core...
In absence of external torque, plasma rotation in tokamaks results from a balance between collisional magnetic braking and turbulent drive. The outcome this competition cooperation is essential to determine the flow. A reduced model, supported by gyrokinetic simulations, first used explain quantify only. ripple amplitude above which drag overcomes viscosity obtained. synergetic impact on toroidal Reynolds stress explored. Simulations show that main effect comes an enhancement radial electric...
This paper presents the performance portable implementation of a kinetic plasma simulation code with C++ parallel algorithm to run across multiple CPUs and GPUs. Relying on language standard parallelism stdpar proposed multi-dimensional array support mdspan, we demonstrate that is possible without harming readability productivity. We obtain good overall for mini-application in range 20 % Kokkos version Intel Icelake, NVIDIA V100, A100 Our conclusion can be candidate develop productive...
Abstract The effect of magnetic field ripple on tokamak plasma without turbulence is studied numerically and augmented with a reduced analytical model that includes neoclassical processes in the presence non-axisymmetric perturbation stochastic transport. For this study, has been implemented GYSELA gyrokinetic code. This implementation verified thanks to test toroidal angular momentum conservation. code was then successfully benchmarked against NEO code, which solves drift kinetic equation,...
Abstract This study is motivated by experiments on Tore Supra and WEST tokamaks where a deepening of the E × B velocity—governed radial electric field r —near edge observed when safety factor decreases in L-mode plasmas. Flux-driven global simulations ion temperature gradient turbulence recover qualitatively trend experiments, i.e. velocity increases decreasing factor. From these simulations, multiple clues point out role establishment even though turbulent intensity with The proposed...