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An asymptotic analysis of the radiation pattern of ion cyclotron resonance heating antennas

Published online by Cambridge University Press:  13 March 2009

R. Koch ,
V. P. Bhatnagar  and
R. R. Weynants
R. Koch
Affiliation:
Laboratoire de Physique des Plasmas, Laboratorium voor Plasmafysica, Association ‘Euratom-Etat belge’, Associatie ‘Euratom-Belgische Staat’, Ecole Royale Militaire, Koninklijke Militaire School, B 1040 Brussels.
V. P. Bhatnagar
Affiliation:
Laboratoire de Physique des Plasmas, Laboratorium voor Plasmafysica, Association ‘Euratom-Etat belge’, Associatie ‘Euratom-Belgische Staat’, Ecole Royale Militaire, Koninklijke Militaire School, B 1040 Brussels.
R. R. Weynants
Affiliation:
Laboratoire de Physique des Plasmas, Laboratorium voor Plasmafysica, Association ‘Euratom-Etat belge’, Associatie ‘Euratom-Belgische Staat’, Ecole Royale Militaire, Koninklijke Militaire School, B 1040 Brussels.
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Abstract

Using the stationary phase method, a simple asymptotic analysis of a two-dimensional model of the coupling of the cold-plasma magnetosonic wave excited by an ion-cyclotron resonance heating (ICRH) antenna is presented. Such an analysis allows quick evaluation of the basic characteristics of the ICRH antenna radiation pattern and shows how the power spectrum radiated by the antenna and plasma dispersion properties combine to produce the power flux distribution observed in the far-field region. The results of the present simplified analysis are found to be in reasonably good agreement with more sophisticated coupling codes. This development thus serves as a simple analytic tool for quick investigation of the most fundamental features of coupling for antenna design studies. With a view to spectrum shaping for improved heating and tokamak RF current drive, the case of a phased antenna array is also analysed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 32 , Issue 2 , October 1984 , pp. 291 - 308
Copyright
Copyright © Cambridge University Press 1984

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References

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