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Olivier Sauter

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Publications associées (471)

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

JET Snake Magnetohydrodynamic Equilibria

Wilfred Anthony Cooper, Olivier Sauter, Jonathan Graves

Magnetohydrodynamic (MHD) equilibrium states with a three-dimensional helical core that display the characteristics of a saturated ideal internal kink mode are computed to model snake structures that have been observed in the JET tokamak [A.~Weller et al. ...

IOP Publishing Ltd2011

A scoping study of the application of neutral beam heating on the TCV tokamak

René Chavan, Basil Duval, Olivier Sauter, Henri Weisen, Alexander Karpushov, Emiliano Fable

The TCV tokamak contributes to the physics understanding of fusion plasmas, broadening the parameter range of reactor relevant regimes, by investigations based on an extensive use of the existing main experimental tools: flexible shaping and high power rea ...

Elsevier B.V.2011

Helical ITER hybrid scenario equilibria

Wilfred Anthony Cooper, Olivier Sauter, Jonathan Graves

Numerical computations of ITER equilibria in the hybrid scenario using a three-dimensional (3D) magnetohydrodynamic equilibrium code with nested magnetic flux surfaces demonstrate the formation of internal 3D helical cores similar to saturated ideal intern ...

IOP2011

Recent Advances in Sawtooth Control

Olivier Sauter, Stefano Coda, Jonathan Graves, James Paley

Important advances have been made recently in the invention and application of experimental methods to control the sawtooth instability in tokamak plasmas. The primary means of control involves the application of either ion cyclotron resonance heating (ICR ...

American Nuclear Society2011

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Wilfred Anthony Cooper, Olivier Sauter, Jonathan Graves

Bifurcated magnetohydrodynamic (MHD) equilibrium states are computed for ITER hybrid scenario and RFX-mod SHAx configurations with very flat or reversed core magnetic shear conditions. In the ITER studies, the minimum inverse rotational transform qmin is n ...

IOP Publishing2011

Magnetohydrodynamic properties of nominally axisymmetric systems with 3D helical core

Wilfred Anthony Cooper, Olivier Sauter, Jonathan Graves

Magnetohydrodynamic equilibrium states with a three-dimensional helical core are computed to model the MAST spherical tokamak and the RFX-mod reversed field pinch. The boundary is fixed as axisymmetric. The MAST equilibrium state has the appearance of an i ...

2011

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

Basil Duval, Timothy Goodman, Jean-Marc Moret, Olivier Sauter, Stefano Coda, James Paley, Federico Alberto Alfredo Felici

A new paradigm is presented to reconstruct the plasma current density profile in a tokamak in real-time. The traditional method of basing the reconstruction on real-time diagnostics combined with a real-time Grad-Shafranov solver suffers from the difficult ...

IOP Publishing Ltd2011

Magentohydrodynamic Properties of Nominally Axisymmetric Systems with 3D Helical Core

Wilfred Anthony Cooper, Olivier Sauter, Jonathan Graves

IOP Publishing2011

On the heating mix of ITER

Olivier Sauter, Minh Quang Tran, Frank Rüdiger Wagner, Hartmut Zohm, Costanza Zucca

This paper considers the heating mix of ITER for the two main scenarios. Presently, 73MWof absorbed power are foreseen in the mix 20/33/20 for ECH, NBI and ICH. Given a sufficient edge stability, Q = 10 the goal of scenario 2 can be reached with 40MW power ...

IOP2010

Experimental demonstration of an up-down asymmetry effect on intrinsic rotation in the TCV tokamak

Basil Duval, Olivier Sauter, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon, Francesco Piras

A new mechanism has recently been proposed that generates a radial flux of parallel momentum in toroidal plasmas. Namely, by considering up-down asymmetric flux surfaces, the symmetry following the magnetic field can be broken and an additional contributio ...

Institute of Physics2010

Feedback control of ECRH polarization on LHD

Timothy Goodman, Olivier Sauter, Federico Alberto Alfredo Felici

The polarization of ECRH waves, set by the orientation of a pair of corrugated mirror polarizers in the transmission line, determines the degree of coupling to O- and X-modes in the plasma and has an important effect on the first-pass absorption. Existing ...

IOP Publishing Ltd2010

Tokamak Magnetohydrodynamic Equilibrium States with Axisymmetric Boundary and a 3D Helical Core

Wilfred Anthony Cooper, Antoine Pochelon, Olivier Sauter, Laurent Villard, Jonathan Graves

Magnetohydrodynamic (MHD) equilibrium states with imposed axisymmetric boundary are computed in which a spontaneous bifurcation develops to produce an internal three-dimensional (3D) configuration with a helical structure in addition to the standard axisym ...

American Physical Society2010

The role of ion and electron electrostatic turbulence in characterizing stationary particle transport in the core of tokamak plasmas

Olivier Sauter, Emiliano Fable

A general feature of particle transport in the core of tokamak plasmas is that when core particle sources are small, a stationary peaked density profile is provided by a balance of outward diffusion and inward convection, driven by either neoclassical or t ...

IOP2010

A generic data structure for integrated modelling of tokamak physics and subsystems

Jonathan Bryan Lister, Olivier Sauter

The European Integrated Tokamak Modelling Task Force (ITM-TF) is developing a new type of fully modular and flexible integrated tokamak simulator, which will allow a large variety of simulation types. This ambitious goal requires new concepts of data struc ...

www.elsevier.com/locate/cpc2010

On the effects of the equilibrium model in gyrokinetic simulatins: From s-alpha to diverted MHD equilibrium

Olivier Sauter, Emiliano Fable, Alice Burckel, Xavier Lapillonne

In order to better identify the role of the magnetic topology on ITG and TEM instabilities, different MHD equilibria with increasing complexity are calculated using the CHEASE code [1]. We start from the geometry of the s-alpha cyclone benchmark case [2], ...

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

Empirical scaling of sawtooth period for onset of neoclassical tearing modes

Olivier Sauter, Stefano Coda, Jonathan Graves

Experimental observations from a range of tokamaks show that neoclassical tearing modes (NTMs) are triggered at lower plasma pressure when the sawtooth period is longer. A multi-machine database from nine tokamaks has been established in order to extrapola ...

IOP Publishing Ltd2010

Experimental Evidence of Momentum Transport Induced by an Up-Down Asymmetric Magnetic Equilibrium in Toroidal Plasmas

Basil Duval, Olivier Sauter, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon, Francesco Piras

The first experimental evidence of parallel momentum transport generated by the up-down asymmetry of a toroidal plasma is reported. The experiments, conducted in the Tokamak a` Configuration Variable, were motivated by the recent theoretical discovery of i ...

2010

"Snowflake" H Mode in a Tokamak Plasma

Basil Duval, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Benoît Labit, János Márki, Andreas Pitzschke, Francesco Piras

An edge-localized mode (ELM) H-mode regime, supported by electron cyclotron heating, has been successfully established in a snowflake (second-order null) divertor configuration for the first time in the TCV tokamak. This regime exhibits 2 to 3 times lowe ...

The American Physical Society2010

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