Commun. Comput. Phys., 5 (2009), pp. 413-425.


Modes of a Plasma-Filled Waveguide Determined by a Numerical hp Method

K. Appert 1*, M. Azaiez 2, R. Gruber 3

1 Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland.
2 TREFLE, (UMR CNRS 8505), Ecole Nationale Superieure de Chimie et de Physique de Bordeaux, Pessac, France.
3 Laboratory of Computational Engineering, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland.

Received 28 September 2007; Accepted (in revised version) 8 January 2008
Available online 1 August 2008

Abstract

We present the application of the recent physics-conforming COOL method \cite{agas07,Azaiez07} to the eigenvalue problem of a cylindrical waveguide filled with unmagnetized plasma. Using the Fourier transform only along the waveguide and not in poloidal direction, this is a relevant test case for a numerical discretization method in two dimensions (radial and poloidal). Analytically, the frequency spectrum consists of discrete electromagnetic parts and, depending on the electron density profile of the plasma, of infinitely degenerate and/or continuous, essentially electrostatic parts. If the plasma is absent, the latter reduces to the infinitely degenerate zero eigenvalue of electrostatics. A good discretization method for the Maxwell equations must reproduce these properties. It is shown here that the COOL method meets this demand properly and to very high precision.


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PACS: 02.60.Lj, 02.70.Hm, 03.50.De, 41.20.Jb
Key words: COOL method, physics-conforming, continuous spectrum, plasma waveguide, spectral method.

*Corresponding author.
Email: Kurt.Appert@epfl.ch (K. Appert), azaiez@enscpb.fr (M. Azaiez), Ralf.Gruber@epfl.ch (R. Gruber)
 

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