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Physics of the conceptual design of the ITER plasma control system

Publications associées (118)

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Kinetic Alfven eigenmodes in a hot tokamak plasma

Ambrogio Fasoli, Laurent Villard, Jonathan Bryan Lister, Kurt Appert

Kinetic effects such as finite ion Larmor excursions and resonant Landau interactions are studied in the toroidicity Alfven eigenmode (TAE) range of frequencies. A new Alfven mode conversion mechanism is described taking place away from the resonances thro ...

1997

Kinetic Alfvén eigenmodes in a hot tokamak plasma

Ambrogio Fasoli, Laurent Villard, Jonathan Bryan Lister, Kurt Appert

Global Alfven eigenmodes are studied using fluid and kinetic plasma models to determine how the finite Larmor excursions of the bulk species and the resonant Landau interactions modify the spectrum in the toroidicity Alfven eigenmode (TAE) range of frequen ...

IAEA1997

Spectrum of ballooning instabilities in a stellarator

Wilfred Anthony Cooper

The recent revival of interest in the application of the ''ballooning formaiism'' to low-frequency plasma instabilities has prompted a comparison of the Wentzel-Kramers-Brillouin (WKB) ballooning approximation with an (in principle) exact normal mode calcu ...

1996

Resistive interchange modes in negative central shear tokamaks with peaked pressure profiles

Olivier Sauter

Resistive interchange modes can be driven unstable by large pressure gradients in the negative central magnetic shear (NCS) region of advanced tokamaks. Localized stability analysis reveals that the resistive interchange stability criterion (D-R less than ...

1996

Global Waves in Resistive and Hot Tokamak Plasmas

Laurent Villard, Kurt Appert

Maxwell's equations are solved in a toroidal axisymmetric plasma. The numerical method implemented in the PENN code is based on a formulation in terms of the electromagnetic potentials and a discretization with standard bilinear or bicubic Hermite finite e ...

1995

Transport Studies for Ignition Experiments

The results of a predictive study of plasma energy confinement in Ignitor, performed with a 1 1/2-dimensional transport code and the Tang-Redi transport model, are reported. For comparison, performance predictions for the Next European Torus (NET), adoptin ...

1993

The Properties of the Frequency Splitting of the Axisymmetrical Magnetoacoustic Wave and an Application to Current Profile Diagnosis

In the presence of finite plasma current, the axisymmetric (m = 0) magnetoacoustic wave resonance exhibits a frequency splitting for finite toroidal mode number (n not-equal 0) between oppositely directed traveling waves. Calculations are presented that de ...

1991

Cold Boronization in Tca

Basil Duval, Christoph Hollenstein

Boronisation of the TCA vacuum vessel was performed at ambient temperature. The paper presents detailed surface analysis of the coating and a description of the tokamak performance after boronisation. The obtained coatings showed a film composition close t ...

1990