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Laurent Villard

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Publications associées (144)

Tokamaks with Reversed Current Density: Current Holes, AC Operation and Axisymmetric Stability

Laurent Villard, Andrei Martynov

2007

Edge kink/ballooning mode stability in tokamaks with separatrix

Yves Martin, Olivier Sauter, Laurent Villard, Andrei Martynov

Stability limits against external kink modes driven by large current density and pressure gradient values in the pedestal region are investigated for tokamak plasmas with separatrix. Stability diagrams for modes with different toroidal wave numbers under v ...

Institute of Physics2006

On the definition of a kinetic equilibrium in global gyrokinetic simulations

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino

Nonlinear electrostatic global gyrokinetic simulations of collisionless ion temperature gradient (ITG) turbulence and ExB zonal flows in axisymmetric toroidal plasmas are examined for different choices of the initial distribution function. Using a local Ma ...

American Institute of Physics2006

Global nonlinear gyrokinetic simulations of ETG turbulence using particles

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino, Emanuele Poli

2006

Three-dimensional warm plasma simulations for low-frequency waves

Stephan Brunner, Wilfred Anthony Cooper, Laurent Villard, Nicolas Mellet, Pavel Popovitch

2006

Plasma Shape Effects on Geodesic Acoustic Oscillations

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino, Ben McMillan

2006

Conservative gyrokinetic Vlasov simulation using Morinishi scheme

Laurent Villard

2006

A drift-kinetic Semi-Lagrangian 4D code for ion turbulence simulation

Olivier Sauter, Laurent Villard

A new code is presented here, named Gyrokinetic SEmi-LAgragian (GYSELA) code, which solves 4D drift-kinetic equations for ion temperature gradient driven turbulence in a cylinder (r, theta, z). The code validation is performed with the slab ITG mode that o ...

Elsevier2006

Edge Stability of TCV Plasma

Roland Behn, Jonathan Bryan Lister, Yves Martin, Olivier Sauter, Laurent Villard, Andrei Martynov

2006

Integrated tokamak modeling taskforce: the integrated modeling project onequilibrium and linear MHD stability

Jonathan Bryan Lister, Olivier Sauter, Laurent Villard

2006

Ion and Electron Dynamics in Nonlinear PIC simulations

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino, Ben McMillan, Emanuele Poli

2006

Plasma elongation and magnetic shear effects in nonlinear simulations of ITG-zonal flow turbulence

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino

2006

Effects of plasma current on nonlinear interactions of ITG turbulence, zonal flows and geodesic acoustic modes

Olivier Sauter, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino

The mutual interactions of ion temperature gradient (ITG) driven modes, zonal flows and geodesic acoustic modes (GAM) in tokamak plasmas are investigated using a global nonlinear gyrokinetic formulation with totally unconstrained evolution of temperature g ...

Institute of Physics2006

A full-wave solver of the Maxwell's equations in 3D cold plasmas

Wilfred Anthony Cooper, Laurent Villard, Pavel Popovitch

A new solver for Maxwell's equations in three-dimensional (3D) plasma configurations is presented. The new code LEMan (Low-frequency ElectroMagnetic wave propagation) determines a global solution of the wave equation in a realistic stellarator geometry at ...

2006

Axisymmetric Mode Stability in Tokamaks with Reversed Current Density

Laurent Villard, Andrei Martynov

2006

Comparing magnetic triggering of ELMs in ASDEX Upgrade and TCV with the DINA-CH tokamak simulator

Jonathan Bryan Lister, Yves Martin, Laurent Villard

2005

Recent advances in non-linear PIC simulaions in magnetic coordinates

Olivier Sauter, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino

2005

Reversed current density in tokamaks - equilibrium and stability issues

Jonathan Bryan Lister, Yves Martin, Olivier Sauter, Laurent Villard, Andrei Martynov

2005

A spectral global gyrokinetic approach to plasma linear microinstability analysis

Laurent Villard, Alberto Bottino, Paolo Angelino

With the term microinstabilities, we indicate a class of plasma drift waves such as the ion temperature gradient (ITG) mode, the trapped electron mode (TEM), and the electromagnetic Alfvenic ion temperature gradient (AITG) mode. They are usually driven by ...

2005

Fine-scale structures and negative-density regions: Comparison of numerical methods for solving the advection equation

Olivier Sauter, Laurent Villard

A common feature of the Vlasov equation is that it develops fine-scale filamentation as time evolves, as observed, for example, in global nonlinear simulations of the ion-temperature-gradient instability. From a numerical point of view, it is not trivial t ...

2005

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