A5068186964- Magnetic confinement fusion research
- Fusion materials and technologies
- Fluid Dynamics and Turbulent Flows
- Physics of Superconductivity and Magnetism
- Gas Dynamics and Kinetic Theory
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- Statistical Mechanics and Entropy
- Dust and Plasma Wave Phenomena
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Meteorological Phenomena and Simulations
- Metallurgical Processes and Thermodynamics
- Fractional Differential Equations Solutions
- Quantum chaos and dynamical systems
- Computational Fluid Dynamics and Aerodynamics
- Plasma Diagnostics and Applications
- Advanced Data Storage Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Laser-induced spectroscopy and plasma
- Cosmology and Gravitation Theories
- Plasma and Flow Control in Aerodynamics
- Lattice Boltzmann Simulation Studies
Physique des interactions ioniques et moléculaires
2021-2024
Centre National de la Recherche Scientifique
2021-2022
Aix-Marseille Université
2021-2022
Institute for Plasma Research
2019
École Polytechnique Fédérale de Lausanne
2014-2018
Max Planck Institute for Plasma Physics - Greifswald
2018
Indian Institute of Science Education and Research Pune
2013-2014
This contribution presents the recent effort at CEA and French federation for fusion to simulate edge plasma transport with new code SOLEDGE3X. The latter can be used both as a 2D or 3D turbulence code. It makes possible simulating up first wall including complex geometry. also includes neutral recycling impurity sputtering, seeding transport. In order improve description in simulation, reduced model intensity prediction has been derived implemented, based on 'k-epsilon' like models from...
Abstract The multi-component fluid closure derived by Zhdanov (2002 Transport Processes in Multicomponent Plasma (London: Taylor and Francis)) is implemented the code SOLEDGE3X-EIRENE to deal with arbitrary edge plasma composition. assumes no distinction between species such as light versus heavy separation. work of rewritten a matricial form order clearly link friction forces heat fluxes different velocities temperature gradients.
The derivation of the multi-temperature generalized Zhdanov closure is provided starting from most general form left hand side moment averaged kinetic equation with Sonine-Hermite polynomial ansatz for an arbitrary number moments. process arriving at reduced higher-order equations, its assumptions and approximations, explicitly outlined. multi-species, coefficients authors' previous article are used to compute values higher order moments such as heat flux in terms lower Transport friction...
Abstract Experimental data, together with interpretive modeling tools, are examined to study trends in the tungsten (W) source all-W environment of WEST tokamak, both from divertor and main chamber. In particular, a poloidal limiter protecting an ion cyclotron resonance heating (ICRH) antenna is used as proxy for chamber sourcing. The key carried out by stepping up lower hybrid current drive (LHCD) power, only auxiliary power source. Limiter W sources exhibit qualitatively similar...
In the past, long-time evolution of an initial perturbation in collisionless Maxwellian plasma (q = 1) has been simulated numerically. The controversy over nonlinear fate such electrostatic perturbations was resolved by Manfredi [Phys. Rev. Lett. 79, 2815–2818 (1997)] using simulations up to t=1600ωp−1. oscillations were found continue indefinitely leading Bernstein-Greene-Kruskal (BGK)-like phase-space vortices (from here on referred as “BGK structures”). Using a newly developed, high...
Grad's method is used on the linearized Boltzmann collision operator to derive most general expressions for coefficients a multi-component, multi-temperature plasma up rank-2. In doing so, then get expressed as series sum of pure temperature and mass ratios multiplied by cross-section dependent Chapman-Cowling integrals. These collisional are compared previously obtained Zhdanov et al [Zhdanov V.M., Transport processes in multi-component plasma, Taylor Francis (2002)] 13N-moment scheme....
Free boundary magnetohydrodynamic equilibrium states with spontaneous three dimensional deformations of the plasma-vacuum interface are computed for first time. The structures obtained have appearance saturated ideal external kink/peeling modes. High edge pressure gradients yield toroidal mode number n = 1 corrugations a high bootstrap current and larger distortions when this is small. Deformations in plasma region induce nonaxisymmetric Pfirsch-Schlüter driving field-aligned ribbon...
In future tokamaks like ITER with tungsten walls, it is imperative to control accumulation in the core of operational plasmas, especially since can lead radiative collapse and disruption.We investigate behaviour trace impurities a JET-like hybrid-scenario both axisymmetric saturated 1/1 ideal helical-core presence strong plasma rotation.For this purpose, we obtain equilibria from VMEC use VENUS-LEVIS, guiding-centre orbit-following code, follow heavy impurity particles.In work, VENUS-LEVIS...
The contamination of core plasma by high-Z impurities, especially tungsten (W), is the main reason very high level radiated power in WEST experiments.Intrinsic light mainly oxygen and carbon, play a dominant role sputtering W on facing components.In this contribution, we present detailed analysis experiments supported numerical modeling performed with transport code SOLEDGE-EIRENE providing clear picture impurities poloidal distribution.Moreover, making use SOLEDGE-ERO2.0simulations,...
Three dimensional free boundary magnetohydrodynamic equilibria that recover saturated ideal kink/peeling structures are obtained numerically. Simulations model the JET tokamak at fixed with a large edge bootstrap current flattens q-profile near plasma demonstrate radial parallel density ribbon dominant m /n = 5/1 Fourier component MA develops into broadband spectrum when toroidal It is increased to 2.5 MA.
An approximate model for a single fluid three-dimensional (3D) magnetohydrodynamic (MHD) equilibrium with pure isothermal toroidal flow imposed nested magnetic flux surfaces is proposed. It recovers the rigorous rotation description in axisymmetric limit. The approximation valid under conditions of nearly rigid or vanishing regions significant 3D deformation surfaces. Bifurcated helical core simulations long-lived modes MAST device demonstrate that structure only weakly affected by but...
The three-dimensional VMEC equilibrium solver has been adapted to numerically investigate the approximate toroidal rotation model we have derived. We concentrate our applications on simulation of JET snakes and MAST long-lived modes under free boundary conditions. Helical core solutions are triggered when 〈β〉 exceeds a threshold value, typically 2.7% in JET-like plasmas. A large plasma current edge bootstrap can drive helical formations at arbitrarily small which ideal saturated internal...
Abstract We aim to simulate the bootstrap current for a MAST-like spherical tokamak using two approaches magnetic equilibria including externally caused 3D effects such as resonant perturbations (RMPs), effect of toroidal ripple, and intrinsic non-resonant internal kink modes. The first approach relies on known neoclassical coefficients in ideal MHD equilibria, Sauter (Sauter et al 1999 Phys. Plasmas 6 2834) expression valid all collisionalities axisymmetry, second being quasi-analytic...
Abstract Strongly peaked tungsten accumulation is a common feature of high performance plasma scenarios in JET with the ITER-like wall, particularly during MHD activity induced by <?CDATA $m/n = 1/1$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>m</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> </mml:math> continuous modes. This study investigates effect $1/1$?> long living internal kink modes...
We demonstrate using high resolution, long time simulations, the existence of BGK structures in 1D collisionless plasmas governed by non-extensive velocity distributions, namely q-distributions. show that are supported only for certain range q-values around q = 1 (Maxwellian). In particular, it is shown values < where distributions have tails, strong Landau damping inhibits formation while on other limit > distribution has a sharp fall velocity, rendered difficult due to wave number imposed...
This thesis concentrates on investigating the presence of 3D ideal MHD instabilities, particularly a saturated 1/1 internal kink, neoclassical phenomena such as bootstrap current and heavy impurity transport. The equilibria are generated using equilibrium solver \texttt{VMEC} under free-boundary conditions is used basis for calculations performed. parallel flows examined Shaing-Callen formulation\cite{ShaingReview}. examination with response to perturbations toroidal field ripple resonant...