Concept

Dérive de Stokes

Publications associées (64)

Antenna excitation of drift wave in a toroidal plasma

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli, Stefan Müller

In a magnetized toroidal plasma, an antenna tunable in vertical wave number is used to excite density perturbations. Coherent detection is performed by means of Langmuir probes to directly determine both the wave vector and the plasma response induced by t ...

American Institute of Physics2007

Nonlinear correlations in phase-space resolved fluctuations at drift wave frequencies

In an effort to better understand plasma transport, we measure fluctuations associated with drift instabilities resolved in the ion phase-space. Primary attention is given to fluctuations near the electron drift frequency where there are two general compon ...

2007

Development of electrostatic turbulence from drift-interchange instabilities in a toroidal plasma

Ambrogio Fasoli, Mario Ludovico Podesta, Francesca Maria Poli

Electrostatic instabilities develop on TORPEX (TORoidal Plasma EXperiment) [A. Fasoli et al., Phys. of Plasmas, 13, 55902 (2006)] in the bad curvature region and propagate consistently with the drift wave dispersion relation. The wave number and frequency ...

2007

Plasma production and transport in a simple magnetised toroidal plasma

Mario Ludovico Podesta

This Thesis addresses questions related to transport phenomena and the plasma production mechanisms by injection of microwaves in the electron-cyclotron frequency range in the simple magnetised toroidal plasma TORPEX. The second subject is investigated in ...

EPFL2007

On the stability of Reduced Basis methods for Stokes Equations in parametrized domains

Gianluigi Rozza

We present an application of reduced basis method for Stokes equations in domains with affine parametric dependence. The essential components of the method are (i) the rapid convergence of global reduced basis approximations – Galerkin projection onto a sp ...

2007

Experimental characterization of drift-interchange instabilities in a simple toroidal plasma

Ambrogio Fasoli, Ivo Furno, Stephan Brunner, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli, Gennady Plyushchev

Low frequency electrostatic instabilities are investigated on TORPEX [Fasoli, Labit, McGrath, Muller, Podesta, and Poli, Bull. Am. Phys. Soc. 48, 119 (2003)], a toroidal device for basic plasma physics experiments with a toroidal magnetic field 100 mT and ...

2006

Mathematical and numerical models for coupling surface and groundwater flows

Alfio Quarteroni, Marco Discacciati, Edie Miglio

We present some results on coupling Navier-Stokes with shallow water equations for surface flows, and with Darcy's equation for groundwater flows. We discuss suitable interface conditions and show the well-posedness of the coupled problem in the case of a ...

2002

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

Analysis of the Yosida Method for the Incompressible Navier-Stokes Equations

Alfio Quarteroni

The Yosida method was introduced in (Quarteroni et al., to appear) for the numerical approximation of the incompressible unsteady Navier-Stokes equations. From the algebraic viewpoint, it can be regarded as an inexact factorization of the matrix arising fr ...

1999

A Stability Analysis for the Arbitrary Lagrangian Eulerian Formulation with Finite Elements

Fabio Nobile, Luca Formaggia

In this paper we present some theoretical results on the Arbitrary Lagrangian Eulerian (ALE) formulation. This formulation may be used when dealing with moving domains and consists in recasting the governing differential equation and the related weak formu ...

1999

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