Concept

Cycle solaire

Publications associées (175)

Toroidally asymmetric ELM precursors in TCV

Coherent magnetic oscillations precede edge localized modes (ELMs) in TCV. The precursor has been detected prior to ELMs considered to be of type III and others previously referred to as TCV large: ELMs. This permits the identification of both as type III ...

1998

Finite element approach to global gyrokinetic Particle-In-Cell simulations using magnetic coordinates

Olivier Sauter, Laurent Villard, Stephan Brunner, Kurt Appert, Trach-Minh Tran

We present a fully-global linear gyrokinetic simulation code (GYGLES) aimed at describing the unstable spectrum of the ion-temperature-gradient modes in toroidal geometry. We formulate the Particle-In-Cell method with finite elements defined in magnetic co ...

1998

Role of urban and suburban aerosols on solar UV radiation over Athens, Greece

Hubert van den Bergh, Bertrand Calpini

The scope of this paper is to provide an exptl. and modeling contribution on the role of suspended lower tropospheric particles to the UV spectral irradiance reaching the ground in urban environments. The UV spectral irradiance was measured with a UV spect ...

1998

Calculation of global modes via ballooning formalisms

Wilfred Anthony Cooper

Ballooning theory is an asymptotic method for treating modes with short wavelength across the magnetic field lines but essentially no phase variation along the lines. The latter constraint leads to problems with maintaining the physically required poloidal ...

1997

Global approach to the spectral problem of microinstabilities in tokamak plasmas using a gyrokinetic model

Stephan Brunner

Ion temperature gradient (ITG) -related instabilities are studied in tokamak-like plasmas with the help of a new global eigenvalue code. Ions are modeled in the frame of gyrokinetic theory so that finite Larmor radius effects of these particles are retaine ...

EPFL1997

The effect of partial poloidal wall sections on the wall stabilization of external kink modes

An analysis of the effect on the wall stabilization of external kink modes due to toroidally continuous gaps in the resistive wall is performed. The effects both with and without toroidal rotation are studied. For a high-beta equilibrium, the mode structur ...

1996

CO2 Mitigation Through the Use of Hybrid Solar-Combined Cycles.

Daniel Favrat

The integration of a solar collector field generating steam into a conventional combined cycle in order to partially replace the fossil fuel required by the latter results in a substantial reduction in greenhouse gases, in an increase in the return on inve ...

1996

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

X-ray tomography on the TCV tokamak

René Chavan, Henri Weisen, Philippe Marmillod, Blaise Marlétaz

The TCV tokamak offers outstanding variability of the plasma shape. Using x-ray tomography, the shape of the inner flux surfaces of a poloidal cross section of the plasma can be reconstructed, including fast variations due to MHD activity. Both the hardwar ...

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

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