Publications by Antoine Pochelon

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

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

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

Stability limits for tokamak plasma with negative triangularity

Olivier Sauter, Laurent Villard, Holger Reimerdes, Antoine Pochelon, Andrei Martynov

Negative triangularity tokamak plasmas are subject of an increased interest both in existing experiments and in studies of core physics as well as power handling relevant to the fusion demonstration power reactor. The ideal MHD stability calculations for t ...

European Physical Society2014

Magnetohydrodynamic helical structures in nominally axisymmetric low-shear tokamak plasmas

Olivier Sauter, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Antoine Pochelon, 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

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, Trach-Minh Tran, 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 Publishing2013

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

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

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

Optimization of the snowflake diverted equilibria in the TCV tokamak

Olivier Sauter, Yves Martin, Laurent Villard, Jean-Marc Moret, Holger Reimerdes, Antoine Pochelon, Francesco Piras, Andrei Martynov

In support of the TCV experimental campaign aiming at studying H-mode plasmas with snowﬂake (SF) divertor, free boundary equilibrium and stability studies were performed with the SPIDER and KINX codes. Due to the high ﬂexibility of plasma sha ...

European Physical Society2012

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, David Pfefferlé, Federico David Halpern, Daniele Brunetti, Jonathan Rossel, Mattia Albergante

Tokamaks with weak to moderate reversed central shear in which the minimum rotational transform

q_{min}

is in the neighbourhood of unity can trigger bifurcated MagnetoHydrodynamic (MHD) equilibrium states, one of which is similar to a saturated ideal ...

2012

Multiple electron cyclotron power deposition location tracking by break-in-slope analysis in TCV plasmas

Timothy Goodman, Jean-Marc Moret, Federico Alberto Alfredo Felici, Joan Decker, Antoine Pochelon, James Paley, Loïc Curchod

Modulation of the amplitude of externally injected electron cyclotron (EC) power is a frequent method used to determine the radial power deposition profile in fusion plasmas. There are many tools to analyze the plasma response to the power modulations unde ...

Institute of Physics2011

Multiple EC power deposition locations tracking by break-in-slope analysis in TCV plasmas

Timothy Goodman, Jean-Marc Moret, Federico Alberto Alfredo Felici, Joan Decker, Antoine Pochelon, James Paley, Loïc Curchod

Modulation of the amplitude of externally injected electron cyclotron (EC) power is a frequent method used to determine the radial power deposition profile in fusion plasmas. There are many tools to analyze the plasma response to the power modulations unde ...

2011

Helical core tokamak MHD equilibrium states

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, Jonathan Rossel, Mattia Albergante

Bifurcated magnetohydrodynamic tokamak equilibrium states with axisymmetric or helical core structure are computed. When a peaked pressure profile is chosen, the helical core structures appear like the {em snakes} that are observed in the JET tokamak. They ...

Caroline Wilkinson2011

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

Stability limits for tokamak plasma with negative triangularity

Magnetohydrodynamic helical structures in nominally axisymmetric low-shear tokamak plasmas

Bifurcated Helical Core Equilibrium States in Tokamaks

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

Optimization of the snowflake diverted equilibria in the TCV tokamak

Bifurcated Helical Core Equilibrium States in Tokamaks

Multiple electron cyclotron power deposition location tracking by break-in-slope analysis in TCV plasmas

Multiple EC power deposition locations tracking by break-in-slope analysis in TCV plasmas

Helical core tokamak MHD equilibrium states

Magnetohydrodynamic helical structures in nominally axisymmetric low-shear tokamak plasmas

Multiple EC power deposition locations tracking by break-in-slope analysis in TCV plasmas

Optimization of the snowflake diverted equilibria in the TCV tokamak

Bifurcated Helical Core Equilibrium States in Tokamaks

Helical core tokamak MHD equilibrium states

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

Stability limits for tokamak plasma with negative triangularity

Multiple electron cyclotron power deposition location tracking by break-in-slope analysis in TCV plasmas

Bifurcated Helical Core Equilibrium States in Tokamaks

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