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Experiments on magneto-hydrodynamics instabilities with ECH/ECCD in FTU using a minimal real-time control system

Publications associées (79)

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Active control of MHD instabilities by ECCD in ASDEX upgrade

Olivier Sauter, Timothy Goodman, Hartmut Zohm

The modification of the stability and the behaviour of core MHD with local electron cyclotron current drive (ECCD) is presented. Starting from the innermost resonant surface, the q = 1 surface, the stability and hence the sawtooth period and the size of sa ...

2005

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

Compact torsatron with improved alpha-particle confinement

Wilfred Anthony Cooper

The compact conventional six-period torsatron L-V with an aspect ratio of A = 3 has been considered as a starting point for further computational optimization of the collisionless confinement of the guiding center orbits of fusion a particles. The configur ...

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

Development of a two-term model for the confinement in ELMy H-modes using the global confinement and pedestal databases

Yves Martin

The overlap of pulses in the pedestal database and the global H-mode confinement database has been increased. This has resulted in a new improved combined dataset with core and pedestal energy data. Regression analysis of this dataset indicates that in ELM ...

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

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

Configuration flexibility and extended regimes in Large Helical Device

Wilfred Anthony Cooper, Kenji Tanaka

Recent experimental results in the Large Helical Device have indicated that a large pressure gradient can be formed beyond the stability criterion for the Mercier (high-n) mode. While the stability against an interchange mode is violated in the inward-shif ...

2001

Ideal MHD stability calculations for compact stellarators

Wilfred Anthony Cooper

Stability results for high-n ideal local pressure-driven instabilities (ballooning and interchange: modes) are calculated from the COBRA and TERPSICHORE codes and compared for several low aspect ratio stellarators. Such a comparison is important because of ...

2001

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