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How accurate are flux-tube (local) gyrokinetic codes in modeling energetic particle effects on core turbulence?

Publications associées (72)

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Ideal MHD stability of tokamak plasmas with moderate and low aspect ratio

The need of durable and abundant energy sources for future ages stimulates the studies of thermonuclear energy sources, based on hot plasma confinement by magnetic fields. The most developed concept of hot plasma trap is the tokamak, where the plasma confi ...

EPFL2005

First principles based simulations of instabilities and turbulence

Olivier Sauter, Laurent Villard, Trach-Minh Tran, Alberto Bottino, Paolo Angelino

It is now widely believed that low frequency turbulence developing from smallscale instabilities is responsible for the phenomenon of anomalous transport generally observed in magnetic confinement fusion experiments. The microinstabilities are driven by gr ...

Institute of Physics2004

Physics of transport in tokamaks

Henri Weisen, Adriano Manini

This paper is an overview of recent results relating to turbulent particle and heat transport, and to the triggering of internal transport barriers (ITBs). The dependence of the turbulent particle pinch velocity on plasma parameters has been clarified and ...

2004

Global-gyrokinetic study of finite beta effects on linear microinstabilities

Laurent Villard

Electromagnetic microinstabilities in tokamak plasmas are studied by means of a linear global eigenvalue numerical code. Ion dynamics is described by the gyrokinetic equation, so that finite ion Larmor radius effects are taken into account to all orders. N ...

2003

Modelling of Alfven waves in JET plasmas with the CASTOR-K code

Ambrogio Fasoli, Duccio Testa

A hybrid magnetohydrodynamic (M H D)-gyro-kinetic model CASTOR-K developed for the study of Alfven eigenmode (AE) stability in the presence of energetic ions has been applied to the interpretation of recent measurements of Alfven waves in JET. These includ ...

2002

MHD stability limits in the TCV tokamak

Holger Reimerdes

Magnetohydrodynamic (MHD) instabilities can limit the performance and degrade the confinement of tokamak plasmas. The Tokamak à Configuration Variable (TCV), unique for its capability to produce a variety of poloidal plasma shapes, has been used to analyse ...

EPFL2001

Modelling of electron transport and of sawtooth activity in tokamaks

Transport phenomena in tokamak plasmas strongly limit the particle and energy confinement and represent a crucial obstacle to controlled thermonuclear fusion. Within the vast framework of transport studies, three topics have been tackled in the present the ...

EPFL2001

Decorrelation of edge plasma turbulence at the transition from low- to high-confinement mode in the DIII-D Tokamak

Stefano Coda

The modification of turbulence in the edge plasma of the DIII-D tokamak at the transition from the low to the high mode of confinement is investigated with a phase-contrast imaging diagnostic. The amplitude and radial correlation length of the turbulence i ...

2000

Effect on confinement of edge-localized modes in TCV

Yves Martin, Jean-Marc Moret, Henri Weisen, Richard Pitts, Antoine Pochelon

The effect of ELMs on confinement in ohmic H-modes has been investigated by analysing the rates of change of global parameters such as the electron content and the stored energy as a function of ELM frequency. In double-null H-modes, ELMs are found to expe ...

1996

Global Marginal Stability of Taes in the Presence of Fast Ions

Laurent Villard, Stephan Brunner

The global stability of toroidicity induced Alfven eigenmodes (TAEs) in the presence of fast ions in realistic tokamak fusion-grade plasmas is analysed with a global, perturbative approach. Volume averaged fast particle betas for marginal stability are obt ...

1995