Publications associées à MHD Stability and Energy Principle for Two-Dimensional Equilibria without Assumption of Nested Magnetic Surfaces

Edge Localized Mode Control in TCV

The Tokamak concept, based on magnetic confinement of a hydrogen plasma, is one of today's most promising paths to energy production by nuclear fusion. The experimental scenarios leading to the largest fusion rate are based on a high confinement plasma reg ...

EPFL2012

First fluctuation measurements in the new confined plasma configuration of the TORPEX device

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Joaquim Loizu Cisquella, Fabio Avino, Annamaria Mosetto, Alexandre Dominique Bovet

The basic plasma physics device TORPEX features some of the main ingredients of the Scrape-Off Layer (SOL) of fusion devices, including gradients of density and magnetic field, as well as magnetic field curvature. A simple magnetized torus configuration (S ...

2012

Ideal MHD stability of helically symmetric magnetic islands

Laurent Villard, Andrei Martynov

A new version of the MHD_NX code, that computes the ideal MHD stability of helically symmetric equilibria with arbitrary topology of magnetic surfaces, was applied to the investigation of equilibrium magnetic islands in tokamak-like conditions. Any helical ...

European Physical Society2012

Interpretation of the effects of electron cyclotron power absorption in pre-disruptive tokamak discharges in ASDEX Upgrade

Olivier Sauter, Daniele Brunetti, Hartmut Zohm

Tokamak disruptions are events of fatal collapse of the magnetohydrodynamic (MHD) confinement configuration, which cause a rapid loss of the plasma thermal energy and the impulsive release of magnetic energy and heat on the tokamak first wall components. T ...

Amer Inst Physics2012

Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

Basil Duval

Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coin ...

2012

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

Holger Reimerdes

DIII-D experiments yield the first proof-of-principle results in feedback control of the proximity to the resistive wall mode (RWM) stability boundary using an active MHD spectroscopic stability measurement and neutral beam injection heating. In contrast t ...

2012

Identification of the ubiquitous Coriolis momentum pinch in JET tokamak plasmas

Henri Weisen, Yann Camenen, Mikhail Maslov

A broad survey of the experimental database of neutral beam heated plasmas in the JET tokamak has established the theoretically expected ubiquity, in rotating plasmas, of a convective transport mechanism which has its origin in the vertical particle drift ...

2012

Global scrape-off layer electromagnetic fluid turbulence simulations

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

Electromagnetic effects play a key role in tokamak edge turbulence. It has been suggested that the density limit and the L to H mode transition may both be due to an interplay between electromagnetic effects, diamagnetic flows and collisionality. (See, e.g ...

2012

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

Three-dimensional phase-field simulation of micropore formation during solidification: Morphological analysis and pinching effect

Michel Rappaz, Alain Jacot, Jean-Luc Desbiolles, Hossein Meidani

A three-dimensional (3-D) multiphase-field model has been developed in order to study the formation of a micropore constrained to grow in a solid network (i.e. pinching effect). The model accounts for the pressure difference due to capillarity between liqu ...

Elsevier2012

MHD Stability and Energy Principle for Two-Dimensional Equilibria without Assumption of Nested Magnetic Surfaces

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Edge Localized Mode Control in TCV

First fluctuation measurements in the new confined plasma configuration of the TORPEX device

Ideal MHD stability of helically symmetric magnetic islands

Interpretation of the effects of electron cyclotron power absorption in pre-disruptive tokamak discharges in ASDEX Upgrade

Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

Identification of the ubiquitous Coriolis momentum pinch in JET tokamak plasmas

Global scrape-off layer electromagnetic fluid turbulence simulations

Bifurcated Helical Core Equilibrium States in Tokamaks

Three-dimensional phase-field simulation of micropore formation during solidification: Morphological analysis and pinching effect

Edge Localized Mode Control in TCV

First fluctuation measurements in the new confined plasma configuration of the TORPEX device

Ideal MHD stability of helically symmetric magnetic islands

Global scrape-off layer electromagnetic fluid turbulence simulations

Three-dimensional phase-field simulation of micropore formation during solidification: Morphological analysis and pinching effect

Interpretation of the effects of electron cyclotron power absorption in pre-disruptive tokamak discharges in ASDEX Upgrade

Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

Identification of the ubiquitous Coriolis momentum pinch in JET tokamak plasmas

Bifurcated Helical Core Equilibrium States in Tokamaks