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Experimental studies of instabilities and confinement of energetic particles on JET and MAST

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MHD spectroscopy

Ambrogio Fasoli, Duccio Testa

Experiments are conducted on the JET tokamak to demonstrate the diagnostic potential of Magneto-Hydro-Dynamics (MHD) spectroscopy, for the plasma bulk and its suprathennal components, using Alfven eigenmodes (AEs) excited by external antennas and by energe ...

2002

Control of neoclassical tearing modes by sawtooth control

Olivier Sauter

The onset of a neoclassical tearing mode (NTM) depends on the existence of a large enough seed island. It is shown in the Joint European Torus that NTMs can be readily destabilized by long-period sawteeth, such as obtained by sawtooth stabilization from io ...

2002

Neutral beam stabilization of sawtooth oscillations in JET

Olivier Sauter, Antoine Pochelon

Recent experiments in the Joint European Torus (JET) have provided evidence of sawtooth stabilization by fast ions arising from deuterium neutral beam injection (NBI). A possible theoretical basis for the interpretation of the observed sawtooth period beha ...

2002

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

Physics of the compact advanced stellarator NCSX

Wilfred Anthony Cooper

Compact optimized stellarators offer novel solutions for confining high-beta plasmas and developing magnetic confinement fusion. The three-dimensional plasma shape can be designed to enhance the magnetohydrodynamic (MHD) stability without feedback or nearb ...

2001

Overview of JET results in support of the ITER physics basis

Ambrogio Fasoli, Duccio Testa, Dalziel Joseph Wilson, Denis Martin, Hairun Guo

The JET experimental campaign has focused on studies in support of the ITER physics basis. An overview of the results obtained is given for the reference ELMy H mode and advanced scenarios, which in JET are based on internal transport barriers. JET studies ...

2001

Gyrokinetic modelling of macro-instabilities in high performance tokamak plasmas

Ambrogio Fasoli, Laurent Villard, Duccio Testa

The modelling of Alfvenic instabilities is discussed from the point of view of mode-conversion, showing how the development of the theory affects the predictions as the limitations of the models are gradually relaxed. Conventional tokamak plasmas are relat ...

2001

Stability of Alfven eigenmodes in optimized tokamaks

Ambrogio Fasoli, Laurent Villard

Alfven eigenmodes (AEs) with intermediate toroidal mode numbers are modelled using the global gyrokinetic PENN code to determine the stability of high performance tokamak discharges in the presence of energetic particles. A large plasma pressure and a weak ...

2000

Global Alfven eigenmode stability in thermonuclear tokamak plasmas

Ambrogio Fasoli, Laurent Villard

Relying on the good agreement observed between the gyrokinetic PENN model and the low toroidal mode number n damping measurements from JET, the stability of Alfven eigenmodes (AEs) is predicted for reactor relevant conditions. Full non-local wave-particle ...

1999

Threshold for metastable tearing modes in DIII-D

Olivier Sauter

At sufficiently high poloidal beta beta(theta) and low collisionality, m/n = 3/2 tearing modes are excited in the DIII-D tokamak by a q = 1 sawtooth crash perturbation. The resulting islands of full radial width w are long lived and reduce global confineme ...

1998