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Olivier Sauter

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Publications associées (471)

High density experiments in TCV ohmically heated and L-mode plasmas

Roland Behn, Basil Duval, Timothy Goodman, Antoine Pochelon, Olivier Sauter, Stefano Coda, Alexander Karpushov, Laurie Porte, Benoît Labit

Recent experiments have been performed on the Tokamak a configuration variable (TCV) to investigate the confinement properties of high density plasmas and the mechanism behind the density limit. In a limiter configuration with plasma elongation kappa = 1.3 ...

Iop Publishing Ltd2015

Effects of central electron cyclotron power on plasma rotation and on triggerless onset of NTMs in the TCV tokamak

Basil Duval, Olivier Sauter, Holger Reimerdes, Jonathan Rossel, Alexander Karpushov, Duccio Testa, Lucia Isabel Federspiel, Dávid Wágner, Doohyun Kim, Donghyun Kim

Experiments on the TCV tokamak show that high power central electron cyclotron heating (ECH) and current drive (ECCD) produce significant direct modification of the plasma rotation profile, as well as the effect on the equilibrium current density. These ef ...

IOP Publishing Ltd2015

Status of the benchmark activity of ICRF full-wave codes within EUROfusion WPCD and beyond

Olivier Sauter, Laurent Villard

As follow-up of the benchmark activity of ICRF full-wave codes within the EUROfusion Code Development for Integrated Modelling project (WPCD), a simple-to-complex approach has been devised for verification of the European ICRF codes, imported in the Europe ...

Amer Inst Physics2015

2014 Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas (Varenna, Italy, 1-5 September 2014) Preface

Olivier Sauter

Iop Publishing Ltd2015

Free boundary equilibrium in 3D tokamaks with toroidal rotation

Wilfred Anthony Cooper, Olivier Sauter, Minh Tâm Tran, Jonathan Graves, David Pfefferlé, Daniele Brunetti, Jonathan Marc Philippe Faustin, Madhusudan Raghunathan

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 the simulation of JET snakes and MAST long-lived modes under free boundary ...

IOP Publishing Ltd2015

Turbulence and zonal flow structures in the core and L-mode pedestal of tokamak plasmas

Stephan Brunner, Olivier Sauter, Trach-Minh Tran, Laurent Villard, Ben McMillan, Julien Stanislas Pierre Dominski, Gabriele Merlo

Zonal flows (ZF) play a crucial role in regulating ion temperature gradient (ITG) turbulence. In previous global gyrokinetic simulations [1] using the ORB5 code with the adiabatic electron model, it was observed that long-lived ZF structures, leading to a ...

IOP Publishing2014

Distributed digital real-time control system for TCV tokamak

Basil Duval, Damien Fasel, Philippe Marmillod, Jean-Marc Moret, Olivier Sauter, Stefano Coda, James Paley, Federico Alberto Alfredo Felici, Hoang Bao Le

A new digital feedback control system (named the SCD "Systeme de Controle Distribue") has been developed, integrated and used successfully to control TCV (Tokamak a Configuration Variable) plasmas. The system is designed to be modular, distributed, and sca ...

Elsevier Science Sa2014

Progress of the ECRH Upper Launcher design for ITER

René Chavan, Timothy Goodman, Olivier Sauter, Jean-Daniel Landis, Francisco Sanchez, Emanuele Poli

The design of the ITER ECRH system provides 20 MW millimeter wave power for central plasma heating and MHD stabilization. The system consists of an array of 24 gyrotrons with power supplies coupled to a set of transmission lines guiding the beams to the fo ...

Elsevier Science Sa2014

On the non-stiffness of edge transport in L-mode tokamak plasmas

Stephan Brunner, Roland Behn, Basil Duval, Timothy Goodman, Olivier Sauter, Stefano Coda, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Doohyun Kim, Gabriele Merlo, Antoine Pierre Emmanuel Alexis Merle, Donghyun Kim

Transport analyses using first-principle turbulence codes and 11/2-D transport codes usually study radial transport properties between the tokamak plasma magnetic axis and a normalized minor radius around 0.8. In this region, heat transport shows significa ...

Amer Inst Physics2014

The European Integrated Tokamak Modelling (ITM) effort: achievements and first physics results

Olivier Sauter, Emanuele Poli, Antonio José Pereira de Figueiredo

A selection of achievements and first physics results are presented of the European Integrated Tokamak Modelling Task Force (EFDA ITM-TF) simulation framework, which aims to provide a standardized platform and an integrated modelling suite of validated num ...

IOP Publishing Ltd2014

Real-time sawtooth control and NTM preemption in ITER

Timothy Goodman, Olivier Sauter, Doohyun Kim, Donghyun Kim

Real-time control of multiple plasma actuators is a requirement in advanced tokamaks; for example, for burn control, plasma current profile control and MHD stabilization electron cyclotron (EC) wave absorption is ideally suited especially for the latter. O ...

American Institute of Physics (AIP)2014

The European Integrated Tokamak Modelling (ITM) effort: achievements and first physics results (vol 54, 043018, 2014)

Olivier Sauter, Emanuele Poli, Antonio José Pereira de Figueiredo

IOP Publishing Ltd2014

Tokamak coordinate conventions: COCOS

Olivier Sauter

Dealing with electromagnetic fields, in particular current and related magnetic fields, yields "natural" physical vector relations in 3-D. However, when it comes to choosing local coordinate systems, the "usual" right-handed systems are not necessarily the ...

Elsevier Science Bv2013

Preliminary design of the ITER ECH Upper Launcher

René Chavan, Timothy Goodman, Olivier Sauter, Jean-Daniel Landis, Hartmut Zohm, Francisco Sanchez, Emanuele Poli

The design of the ITER electron cyclotron launchers recently reached the preliminary design level - the last major milestone before design finalization. The ITER ECH system contains 24 installed gyrotrons providing a maximum ECH injected power of 20 MW thr ...

Elsevier Science Sa2013

Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER

Timothy Goodman, Olivier Sauter, Stefano Coda, Martin Jucker, Jonathan Graves, Costanza Zucca, Otto Asunta

13 MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirically predicted to trigger neoclassical tearing modes (NTMs). However, since t ...

IOP Publishing Ltd2013

Magnetohydrodynamic helical structures in nominally axisymmetric low-shear tokamak plasmas

Wilfred Anthony Cooper, Antoine Pochelon, Olivier Sauter, Holger Reimerdes, Jonathan Graves, Federico David Halpern, Daniele Brunetti

The primary goal of hybrid scenarios in tokamaks is to enable high performance operation with large plasma currents whilst avoiding MHD instabilities. However, if a local minimum in the safety factor is allowed to approach unity, the energy required to ove ...

Iop Publishing Ltd2013

Bifurcated Helical Core Equilibrium States in Tokamaks

Wilfred Anthony Cooper, Basil Duval, Antoine Pochelon, Olivier Sauter, Trach-Minh Tran, Holger Reimerdes, Stefano Coda, Jonathan Graves, Benoît Labit, David Pfefferlé, Federico David Halpern, Daniele Brunetti

Tokamaks with weak to moderate reversed central shear in which the minimum inverse rotational transform (safety factor) qmin is in the neighbourhood of unity can trigger bifurcated magnetohydrodynamic equilibrium states, one of which is similar to a satura ...

IOP Publishing Ltd2013

Non-linear magnetic perturbations during edge-localized modes in TCV dominated by low n mode components

Olivier Sauter, Holger Reimerdes, Hartmut Zohm

Edge-localized modes (ELMs) are instabilities in the edge of tokamak plasmas in the high confinement regime (H-mode). Despite beneficial aspects of ELMs, in a future device the size of the energy loss per ELM must be controlled, in order to avoid intolerab ...

IOP Publishing Ltd2013

Development of real-time plasma analysis and control algorithms for the TCV tokamak using SIMULINK

Basil Duval, Timothy Goodman, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Lucia Isabel Federspiel, Alessandro Bortolon, Andreas Pitzschke, James Paley, Francesco Piras, Federico Alberto Alfredo Felici, Wouter Vijvers, Hoang Bao Le

One of the key features of the new digital plasma control system installed on the TCV tokamak is the possibility to rapidly design, test and deploy real-time algorithms. With this flexibility the new control system has been used for a large number of new e ...

Elsevier2013

Fast seeding of NTMs by sawtooth crashes in TCV and their preemption using ECRH

Basil Duval, Timothy Goodman, Antoine Pochelon, Olivier Sauter, Holger Reimerdes, Jonathan Graves, Duccio Testa

Many tokamaks have observed that sawteeth of sufficient duration may trigger neoclassical tearing modes (NTMs) that lead to plasma performance degradation. In this paper, TCV's ability to accurately control the period of individual sawteeth is exploited, u ...

IOP Publishing Ltd2013

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