Publications related to Low frequency electromagnetic wave propagation in 3D plasma configurations

A vector field method on the distorted Fourier side and decay for wave equations with potentials

We study the Cauchy problem for the one-dimensional wave equation

\partial_t^2 u(t,x)-\partial_x^2 u(t,x)+V(x)u(t,x)=0.

The potential

V

is assumed to be smooth with asymptotic behavior

V(x)\sim -\tfrac14 |x|^{-2}\mbox{ as } |x|\to \infty.

...

2016

ICRH induced particle losses in Wendelstein 7-X

Jonathan Graves, Wilfred Anthony Cooper, David Pfefferlé, Jonathan Marc Philippe Faustin

Fast ions in W7-X will be produced either by neutral beam injection (NBI) or by ion-cyclotron resonant heating (ICRH). The latter presents the advantage of depositing power locally and does not suffer from core accessibility issues (Drevlak et al 2014 Nucl ...

Plasma Physics and Controlled Fusion2016

Energetic ion dynamics and confinement in 3D saturated MHD configurations

David Pfefferlé

In the following theoretical and numerically oriented work, a number of findings have been assembled. The newly devised VENUS-LEVIS code, designed to accurately solve the motion of energetic particles in the presence of 3D magnetic fields, relies on a non- ...

EPFL2015

Extended MHD simulations of infernal mode dynamics and coupling to tearing modes

Jonathan Graves, Wilfred Anthony Cooper, Federico David Halpern, Daniele Brunetti

A numerical study of pressure driven magnetohydrodynamic (MHD) instabilities in a low-shear tight aspect ratio configuration is presented. When the magnetic shear is sufficiently small over an extended region in the core, enhanced instability occurs due to ...

Iop Publishing Ltd2015

Interaction between the Lower Hybrid wave and density fluctuations in the scrape-off layer

Joan Decker

In the present paper, the perturbation of the launched power spectrum of the Lower Hybrid wave at the separatrix by electron density fluctuations in the scrape-off layer is investigated. Considering a slab geometry with magnetic field lines parallel to the ...

Amer Inst Physics2015

Modeling of ion-cyclotron resonant heating in Wendelstein 7-X equilibrium

Jonathan Graves, Wilfred Anthony Cooper, David Pfefferlé, Jonathan Marc Philippe Faustin

W7X stellarator 3D equilibrium has been computed with the equilibrium code ANIMEC (Anisotropic Neumann Inverse Moments Equilibrium Code). This equilibrium was used to model ICRH minority heating in 4He(H) plasma with the 3D full-wave code LEMan (Low freque ...

2014

The flux-coordinate independent approach applied to X-point geometries

A Flux-Coordinate Independent (FCI) approach for anisotropic systems, not based on magnetic flux coordinates, has been introduced in Hariri and Ottaviani [Comput. Phys. Commun. 184, 2419 (2013)]. In this paper, we show that the approach can tackle magnetic ...

Amer Inst Physics2014

Finite element heterogeneous multiscale method for the wave equation: long-time effects

Assyr Abdulle

A new finite element heterogeneous multiscale method (FE-HMM) is proposed for the numerical solution of the wave equation over long times in a rapidly varying medium. Our new FE-HMM-L method captures not only the short-time behavior of the wave field, well ...

Siam Publications2014

Field enhancement and saturation of milimeter waves inside a metallic nanogap

Hoài-Minh Nguyên

This paper investigates the millimeter electromagnetic waves passing through a metal nanogap. Based upon the study of a perfect electrical conductor model, we show that the electric field enhancement inside the gap saturates as the gap size approaches zero ...

2014

Tokamak coordinate conventions: COCOS

Olivier Sauter

Dealing with electromagnetic fields, in particular current and related magnetic fields, yields "natural" physical vector relations in 3-D. However, when it comes to choosing local coordinate systems, the "usual" right-handed systems are not necessarily the ...

Elsevier Science Bv2013

Low frequency electromagnetic wave propagation in 3D plasma configurations

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A vector field method on the distorted Fourier side and decay for wave equations with potentials

ICRH induced particle losses in Wendelstein 7-X

Energetic ion dynamics and confinement in 3D saturated MHD configurations

Extended MHD simulations of infernal mode dynamics and coupling to tearing modes

Interaction between the Lower Hybrid wave and density fluctuations in the scrape-off layer

Modeling of ion-cyclotron resonant heating in Wendelstein 7-X equilibrium

The flux-coordinate independent approach applied to X-point geometries

Finite element heterogeneous multiscale method for the wave equation: long-time effects

Field enhancement and saturation of milimeter waves inside a metallic nanogap

Tokamak coordinate conventions: COCOS

Interaction between the Lower Hybrid wave and density fluctuations in the scrape-off layer

Finite element heterogeneous multiscale method for the wave equation: long-time effects

A vector field method on the distorted Fourier side and decay for wave equations with potentials

Extended MHD simulations of infernal mode dynamics and coupling to tearing modes

Tokamak coordinate conventions: COCOS

Energetic ion dynamics and confinement in 3D saturated MHD configurations

Modeling of ion-cyclotron resonant heating in Wendelstein 7-X equilibrium

The flux-coordinate independent approach applied to X-point geometries

ICRH induced particle losses in Wendelstein 7-X

Field enhancement and saturation of milimeter waves inside a metallic nanogap