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Stability of global drift-kinetic Alfven eigenmodes in DIII-D

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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

Effects of global MHD instability on operational high beta-regime in LHD

Wilfred Anthony Cooper, Kenji Tanaka

In the Large Helical Device (LHD), the highest operational averaged beta value has been expanded from 3.2% to 4% in the last 2 years by increasing the heating capability and exploring a new magnetic configuration with a high aspect ratio. Although the magn ...

2005

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

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

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

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

Global linear gyrokinetic simulations in quasi-symmetric configurations

Laurent Villard, Wilfred Anthony Cooper, Kurt Appert, Trach-Minh Tran

First global linear study of electrostatic drift waves in two realistic quasisymmetric configurations, namely the Quasi-Axially symmetric Stellarator with three fields periods (QAS3) [P. Garabian and L. P. Ku, Phys. Plasma 6, 645 (1999)] and the Helically ...

2001

MHD characteristics in the high beta regime of the Large Helical Device

Wilfred Anthony Cooper, Kenji Tanaka

The highest volume averaged beta values beta (t) of 2.2% at B-t = 0.75 T (gas puff) and 2.4% at D-t = 1.3 T (pellet) in helical devices have been achieved in LHD. The beta (t) dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 ...

2001

Quasi-two-dimensional waves in three-dimensional magnetic confinement systems

Wilfred Anthony Cooper

A reduced scalar magnetohydrodynamic (MHD) description for linear perturbations of arbitrary aspect-ratio, fully three-dimensional plasma configurations is derived for perturbations with short scale-length perpendicular to the magnetic field. The applicati ...

1998

MHD calculations for MHH2

Wilfred Anthony Cooper

A survey of the magnetohydrodynamic (MHD) properties of the quasi-axisymmetric configuration MHH2 has been performed using a suite of MHD codes: the PIES code at Princeton for studying loss of equilibrium flux surfaces; three-dimensional Mercier and balloo ...

1997