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Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV

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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

Enhancing the control of tokamaks via a continuous nonlinear control law

Jean-Yves Favez

The control of the current, position and shape of an elongated cross-section tokamak plasma is complicated by the instability of the plasma vertical position. In this case the control becomes a significant problem when saturation of the power supplies is c ...

EPFL2004

On the form of NTM onset scalings

Olivier Sauter

Theoretically, the normalized plasma pressure (beta) at which a neoclassical tearing mode (NTM) is triggered is expected to depend on normalized Larmor radius (rho*) and normalized collisionality (nu), and this has formed the basis for the way in which NTM ...

2004

Edge localized modes in DIII-D high performance discharges

Olivier Sauter, Hartmut Zohm

A new understanding of edge localized modes (ELMs) in tokamak discharges is emerging (Snyder P B et al 2002 Phys. Plasmas 9 2037), in which the ELM is an essentially ideal magnetohydrodynamic (MHD) instability and the ELM severity is determined by the radi ...

2003

Magnetic triggering of ELMs in TCV

Yves Martin, Laurent Villard, Jonathan Bryan Lister

Experiments on the TCV tokamak have shown that rapid vertical movement of diverted ELMy H-mode plasmas can affect the time sequence of edge localized modes. The effect is attributed to the induction of an edge current during the movement of the plasma colu ...

2003

Integrated scenario in JET using real-time profile control

Olivier Sauter

The recent development of real-time measurements and control tools in JET has enhanced the reliability and reproducibility of the relevant ITER scenarios. Diagnostics such as charge exchange, interfero-polarimetry, electron cyclotron emission have been upg ...

2003

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 macroscopic magnetic islands in tokamaks

Olivier Sauter, Ivo Furno, Andrei Martynov

The article presents experimental and theoretical investigations on the dynamics of saw-teeth and neoclassical tearing modes in tokamak plasmas. The main findings of these investigations are: (1) The experimental validation, on the basis of FTU and TCV dat ...

2001

Effect of triangular and elongated plasma shape on the sawtooth stability

Olivier Sauter, Timothy Goodman, Holger Reimerdes, Antoine Pochelon, Andrei Martynov

In the TCV tokamak the sawtooth period and the sawtooth amplitude are observed to depend strongly on the shape of the poloidal plasma cross section. Systematic scans of plasma elongation and triangularity show small sawteeth with short periods at high elon ...

2000

Model for humpback relaxation oscillations

Olivier Sauter, Timothy Goodman, Ivo Furno, Holger Reimerdes, Antoine Pochelon, Roland Behn

An interpretation of non-standard, central MHD events in the TCV tokamak during localized ECRH is presented. It is shown that the non-standard behaviour is a consequence of specific features in the electron temperature profile produced when ECRH power is d ...

2000