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Stephan Brunner

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Related publications (134)

Integrated modelling of Ion Cyclotron Resonant Heating in toroidal system

Stephan Brunner, Wilfred Anthony Cooper, Nicolas Mellet, Martin Jucker, Jonathan Graves

An integrated model capable of self-consistent Ion Cyclotron Resonant Heating (ICRH) simulations has been developed. This model includes both full shaping and pressure effects, warm contributions to the dielectric tensor, pressure anisotropy and finite orb ...

Elsevier B.V2011

Two-dimensional Vlasov simulation of electron plasma wave trapping, wavefront bowing, self-focusing, and sideloss

Stephan Brunner

Two-dimensional Vlasov simulations of nonlinear electron plasma waves are presented, in which the interplay of linear and nonlinear kinetic effects is evident. The plasma wave is created with an external traveling wave potential with a transverse envelope ...

American Institute of Physics (AIP)2011

Global Nonlinear Electromagnetic Simulations of Tokamak Turbulence

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

The particle-in-cell code ORB5 is a global gyrokinetic turbulence simulation code in tokamak geometry. It has been developed at CRPP, Lausanne, Switzerland, with major contributions from IPP, Garching, Germany, and IPP, Greifswald, Germany, under a long-st ...

Institute of Electrical and Electronics Engineers2010

Toroidal Universal Drift Instability: A Global Gyrokinetic Study

Stephan Brunner, Laurent Villard

An electron density gradient driven instability identified as the toroidal branch of the universal drift instability is studied using a global gyrokinetic model treating both electrons and ions fully nonadiabatically and valid at all orders in the ratio of ...

American Institute of Physics (AIP)2010

Gyrokinetic simulations of turbulent transport: size scaling and chaotic behaviour

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

Important steps towards the understanding of turbulent transport have been made with the development of the gyrokinetic framework for describing turbulence and with the emergence of numerical codes able to solve the set of gyrokinetic equations. This paper ...

IOP Publishing2010

Nonlinear quasisteady state benchmark of global gyrokinetic codes

Stephan Brunner, Laurent Villard, Xavier Lapillonne, Ben McMillan

Two global gyrokinetic codes are benchmarked against each other by comparing simulation results in the case of ion temperature gradient driven turbulence, in the adiabatic electron response limit The two codes are the Eulerian code GENE and the Lagrangian ...

American Institute of Physics2010

Neoclassical equilibria as starting point for global gyrokinetic microturbulence simulations

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

The implementation of linearized operators describing inter- and like-species collisions in the global gyrokinetic particle-in-cell code ORB5 [ S. Jolliet, Comput. Phys. Commun. 177, 409 (2007) ] is presented. A neoclassical axisymmetric equilibrium with s ...

American Institute of Physics2010

Global collisional gyrokinetic simulations of ITG microturbulence starting from a neoclassical equilibrium

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

Linearized operators describing inter-species and like-species collisions have been discretized and implemented in the gyrokinetic Particle-In-Cell (PIC) code ORB5 [S. Jolliet, Comp. Phys. Comm. 177, 409 ( 2007)] based on the delta-f approach. Simulation r ...

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2010

Clarifications to the limitations of the s-alpha equilibrium model for gyrokinetic computations of turbulence

Stephan Brunner, Laurent Villard, Sébastien Jolliet, Alessandro Marinoni, Xavier Lapillonne

In the context of gyrokinetic flux-tube simulations of microturbulence in magnetized toroidal plasmas, different treatments of the magnetic equilibrium are examined. Considering the Cyclone DIII-D base case parameter set [Dimits et al., Phys. Plasmas 7, 96 ...

American Institute of Physics2009

The effect of plasma triangularity on turbulent transport:modelling TCV experiments by linear and non linear gyrokinetic simulations

Stephan Brunner, Antoine Pochelon, Olivier Sauter, Laurent Villard, Stefano Coda, Yann Camenen, Jonathan Graves, Alessandro Marinoni, Xavier Lapillonne

The effect of plasma shape on confinement has been experimentally explored in the TCV tokamak revealing that the core electron heat transport is significantly reduced by a negative triangularity configuration, which could indicate a (partial) stabilization ...

2009

A comprehensive gyrokinetic description of global electrostatic microinstabilities in a tokamak

Stephan Brunner, Laurent Villard, Paolo Angelino

It is believed that low frequency microinstabilities such as ion temperature gradient (ITG) driven modes and trapped electron modes (TEMs) are largely responsible for the experimentally observed anomalous transport via the ion and electron channels in a to ...

American Institute of Physics (AIP)2009

Mechanism for blob generation in the TORPEX toroidal plasma

Stephan Brunner, Ambrogio Fasoli, Ivo Furno, Jonathan Graves, Mario Ludovico Podesta, Francesca Maria Poli, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler

The mechanism for blob generation is detailed in the toroidal magnetized plasma of the TORPEX device [ Fasoli et al., Phys. Plasmas 13, 055902 (2006) ] using an experimental configuration, which features a plasma region dominated by a coherent wave and a r ...

2008

Role of nonadiabatic untrapped electrons in global electrostatic ion temperature gradient driven modes in a tokamak

Stephan Brunner, Laurent Villard, Paolo Angelino

In this work, role of nonadiabatic untrapped electrons in the context of a global ion temperature gradient driven mode has been investigated. In past studies, untrapped electrons have been assumed to be able to respond "instantaneously" to a disturbance. I ...

American Institute of Physics2008

Stephan Brunner, Stefano Alberti, Roland Behn, Basil Duval, Ambrogio Fasoli, Timothy Goodman, Antoine Pochelon, Ivo Furno, Holger Reimerdes, Stefano Coda, Alberto Bottino, Andrea Scarabosio, Yann Camenen, Jonathan Graves, Alessandro Bortolon, Alessandro Marinoni

2007

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Stephan Brunner

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Integrated modelling of Ion Cyclotron Resonant Heating in toroidal system

Two-dimensional Vlasov simulation of electron plasma wave trapping, wavefront bowing, self-focusing, and sideloss

Global Nonlinear Electromagnetic Simulations of Tokamak Turbulence

Toroidal Universal Drift Instability: A Global Gyrokinetic Study

Gyrokinetic simulations of turbulent transport: size scaling and chaotic behaviour

Nonlinear quasisteady state benchmark of global gyrokinetic codes

Neoclassical equilibria as starting point for global gyrokinetic microturbulence simulations

Global collisional gyrokinetic simulations of ITG microturbulence starting from a neoclassical equilibrium

Clarifications to the limitations of the s-alpha equilibrium model for gyrokinetic computations of turbulence

The effect of plasma triangularity on turbulent transport:modelling TCV experiments by linear and non linear gyrokinetic simulations

A comprehensive gyrokinetic description of global electrostatic microinstabilities in a tokamak

Mechanism for blob generation in the TORPEX toroidal plasma

Role of nonadiabatic untrapped electrons in global electrostatic ion temperature gradient driven modes in a tokamak

High- and Low-Confinement Modes in Simple Magnetized Toroidal Plasmas

The impact of triangularity on plasma confinement: TCV experiments vs non-linear gyrokinetic modelling

The impact of triangularity on plasma confinement: TCV experiments vs non-linear gyrokinetic modelling

Physics insight from plasma shaping experiments in the TCV tokamak

The role of electron-driven microinstabilities in particle transport observed during electron ITBs

Development of a Semi-Lagrangian Gyrokinetic Simulation Code

3D warm effects for low-frequency wave propagation in magnetically confined plasmas