Most present Ion Cyclotron Resonant Frequency (ICRF) heating codes and antenna codes assume the antenna sitting in a vacuum region and consider the fast wave only, which implicitly performs an abrupt density transition from vacuum to above lower hybrid (LH) resonance. We studied the impact of densities that decay continuously inside the antenna box on near field patterns and power coupling. A new full wave code based on the COMSOL Finite Element Solver has been developed to investigate this topic. It is shown that: up to the memory limits of the adopted workstation, the local RF field pattern in low-density regions below the LH resonance changes with the grid size. Interestingly and importantly, however, the total coupled spectrum is independent to the mesh size and is weakly affected by the presence of the density profile inside the antenna box in dipole phasing. Thus one can drop out this density for coupling studies. Simulation also shows that varying the density gradient in the fast wave evanescence region has no significant effect on wave coupling.
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10 December 2015
RADIO FREQUENCY POWER IN PLASMAS: Proceedings of the 21st Topical Conference
27–29 April 2015
California, USA
Research Article|
December 10 2015
Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box
L. Lu;
L. Lu
a)
1
CEA
, IRFM, F-13108 Saint-Paul-Lez-Durance, France
2
Institut Jean Lamour
, University of Lorraine, Nancy, France
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K. Crombé;
K. Crombé
3
EURATOM-Belgian State
, LPP-ERM-KMS, TEC partner, Brussels, Belgium
4Department of Applied Physics,
Gent University
, Belgium
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D. Van Eester;
D. Van Eester
3
EURATOM-Belgian State
, LPP-ERM-KMS, TEC partner, Brussels, Belgium
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L. Colas;
L. Colas
1
CEA
, IRFM, F-13108 Saint-Paul-Lez-Durance, France
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J. Jacquot
J. Jacquot
5
Max-Planck-Institut für Plasmaphysik
, EURATOM-Assoziation, Garching, Germany
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a)
Corresponding author: ling-feng.lu@cea.fr
AIP Conf. Proc. 1689, 050003 (2015)
Citation
L. Lu, K. Crombé, D. Van Eester, L. Colas, J. Jacquot; Wave coupling in the magnetized plasma edge: Impact of a finite, inhomogeneous density inside the antenna box. AIP Conf. Proc. 10 December 2015; 1689 (1): 050003. https://doi.org/10.1063/1.4936491
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