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Stephan Brunner

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Publications associées (134)

Complete multi-field characterization of the geodesic acoustic mode in the TCV tokamak

Stephan Brunner, Laurent Villard, Stefano Coda, Laurie Porte, Thibaut Vernay, Cornelis Adrianus de Meijere, Julien Stanislas Pierre Dominski, Zhouji Huang, Gabriele Merlo

The geodesic acoustic mode (GAM) is a coherently oscillating zonal flow that may regulate turbulence in toroidal plasmas. Uniquely, the complete poloidal and toroidal structure of the magnetic component of the turbulence-driven GAM has been mapped in the T ...

Iop Publishing Ltd2014

Role of trapped electrons on global gyrokinetic linear stability of collisinless microtearing modes

Stephan Brunner, Laurent Villard

2014

Electron and ion kinetic effects on non-linearly driven electron plasma and ion acoustic waves

Stephan Brunner

Fully non-linear kinetic simulations of electron plasma and ion acoustic waves (IAWs) have been carried out with a new multi-species, parallelized Vlasov code. The numerical implementation of the Vlasov model and the methods used to compute the wave freque ...

Amer Inst Physics2013

Kinetic Simulations of the Self-Focusing and Dissipation of Finite-Width Electron Plasma Waves

Stephan Brunner

Two-dimensional simulations, both Vlasov and particle-in-cell, are presented that show the evolution of the field and electron distribution of finite-width, nonlinear electron plasma waves. The intrinsically intertwined effects of self-focusing and dissipa ...

Amer Physical Soc2013

Kinetic Theory and Vlasov Simulation of Nonlinear Ion-Acoustic Waves in Multi-Ion Species Plasmas

Stephan Brunner

The theory of damping and nonlinear frequency shifts from particles resonant with ion-acoustic waves (IAWs) is presented for multi-ion species plasma and compared to driven wave Vlasov simulations. Two distinct IAW modes may be supported in multi-ion speci ...

Amer Physical Soc2013

Global and local gyrokinetic simulations of high-performance discharges in view of ITER

Stephan Brunner, Olivier Sauter, Laurent Villard

One of the key challenges for plasma theory and simulation in view of ITER is to enhance the understanding and predictive capability concerning high-performance discharges. This involves, in particular, questions about high-beta operation, ion temperature ...

IOP Publishing Ltd2013

Global Gyrokinetic Simulations of TEM Microturbulence

Stephan Brunner, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Thibaut Vernay, Ben McMillan

Institute of Physics2013

Global Gyrokinetic ITG Turbulence Simulations of ITER

Stephan Brunner, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino, Thibaut Vernay, Ben McMillan

Global gyrokinetic simulations of ion temperature gradient (ITG) driven turbulence in an ideal MHD ITER equilibrium plasma are performed with the ORB5 code. The noise control and field-aligned Fourier filtering procedures implemented in ORB5 are essential ...

Institute of Physics2013

Identifying the role of non-adiabatic passing electrons in ITG/TEM microturbulence by comparing fully kinetic and hybrid electron simulations

Stephan Brunner, Julien Stanislas Pierre Dominski

The response of passing electrons in Ion Temperature Gradient (ITG) and Trapped Electron Mode (TEM) microinstability regimes is investigated in tokamak geometry making use of the flux-tube version of the gyrokinetic code GENE [Jenko et al. 2000 Phys. Plasm ...

IOP Publishing Ltd2012

Synergy between ion temperature gradient turbulence and neoclassical processes in global gyrokinetic particle-in-cell simulations

Stephan Brunner, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Thibaut Vernay, Ben McMillan

Based on the CYCLONE case, simulations of collisional electrostatic ion temperature gradient (ITG) microturbulence carried out with the global gyrokinetic particle-in-cell (PIC) code ORB5 are presented. Considering adiabatic electrons, an increase in ion h ...

American Institute of Physics (AIP)2012

Locality and universality in gyrokinetic turbulence

Stephan Brunner, Laurent Villard

The nature of nonlinear interactions in gyrokinetic (GK) turbulence, driven by the ion-temperature gradient instability, is investigated using direct numerical simulations in toroidal flux tube geometry. To account for the level of separation existing betw ...

American Physical Society2012

Short wavelength ion temperature gradient turbulence

Stephan Brunner, Laurent Villard, Xavier Lapillonne

The ion temperature gradient (ITG) mode in the high wavenumber regime (k(y)rho(s) > 1), referred to as short wavelength ion temperature gradient mode (SWITG) is studied using the nonlinear gyrokinetic electromagnetic code GENE. It is shown that, although t ...

American Institute of Physics2012

Recent TCV results – innovative plasma shaping to improve plasma properties and insight

Stephan Brunner, Basil Duval, Timothy Goodman, Jean-Marc Moret, Antoine Pochelon, Olivier Sauter, Laurent Villard, Holger Reimerdes, Stefano Coda, Alberto Bottino, Sébastien Jolliet, Jonathan Rossel, Alexander Karpushov, Laurie Porte, Paolo Angelino, Benoît Labit, Alessandro Marinoni, Mikael Rancic, Andreas Pitzschke, Dávid Wágner, David Nicholas Wagner

2012

Parallel filtering in global gyrokinetic simulations

Stephan Brunner, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Paolo Angelino, Thibaut Vernay, Ben McMillan

In this work, a Fourier solver [B.F. McMillan, S. Jolliet, A. Bottino, P. Angelino, T.M. Tran, L Villard, Comp. Phys. Commun. 181 (2010) 7151 is implemented in the global Eulerian gyrokinetic code GT5D [Y. Idomura, H. Urano, N. Aiba, S. Tokuda, Nucl. Fusio ...

Elsevier2012

Global simulations of tokamak microturbulence: finite beta effects and collisions

Stephan Brunner, Trach-Minh Tran, Laurent Villard, Alberto Bottino, Sébastien Jolliet, Thibaut Vernay, Ben McMillan

In this paper, we present global nonlinear gyrokinetic simulations including finite beta effects and collisions in tokamak geometry. Global electromagnetic simulations using conventional delta-f particle in cell methods are very demanding, with respect to ...

Institute of Physics2011

Convolution and iterative methods applied to low frequency waves in 3D configurations

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

Kinetic effects have been implemented in the three-dimensional full-wave code LEMan. These allow modeling Landau damping as well as the Kinetic Alfvén Wave (KAW). Special attention has been taken on the exact computation of the parallel wave vector as it c ...

Elsevier2011

Non-Linear Gyrokinetic Simulations of Microturbulence in TCV Electron Internal Transport Barriers

Stephan Brunner, Olivier Sauter, Laurent Villard, Emiliano Fable, Xavier Lapillonne

Using the local (flux-tube) version of the Eulerian code GENE (Jenko et al 2000 Phys. Plasmas 7 1904), gyrokinetic simulations of microturbulence were carried out considering parameters relevant to electron-internal transport barriers (e-ITBs) in the TCV t ...

IOP Publishing2011

Flux- and gradient-driven global gyrokinetic simulation of tokamak turbulence

Stephan Brunner, Olivier Sauter, Laurent Villard, Xavier Lapillonne, Ben McMillan

The Eulerian gyrokinetic turbulence code GENE has recently been extended to a full torus code. Moreover, it now provides Krook-type sources for gradient-driven simulations where the profiles are maintained on average as well as localized heat sources for a ...

2011

The global version of the gyrokinetic turbulence code GENE

Stephan Brunner, Xavier Lapillonne

The understanding and prediction of transport due to plasma microturbulence is a key open problem in modern plasma physics, and a grand challenge for fusion energy research. Ab initio simulations of such small-scale, low-frequency turbulence are to be base ...

2011

Full-field drift Hamiltonian particle orbits in 3D geometry

Stephan Brunner, Wilfred Anthony Cooper, Jonathan Graves

A Hamiltonian/Lagrangian theory to describe guiding centre orbit drift motion which is canonical in the Boozer coordinate frame has been extended to include full electromagnetic perturbed fields in anisotropic pressure 3D equilibria with nested magnetic fl ...

IOP2011

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