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Full-wave calculations of the O-X mode conversion process

Published online by Cambridge University Press:  13 March 2009

F. R. Hansen ,
J. P. Lynov ,
C. Maroli  and
V. Petrillo
F. R. Hansen
Affiliation:
Association EURATOM - Risø National Laboratory, DK-4000 Roskilde, Denmark
J. P. Lynov
Affiliation:
Association EURATOM - Risø National Laboratory, DK-4000 Roskilde, Denmark
C. Maroli
Affiliation:
Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Via Bassini 15, I-20133 Milano, Italy
V. Petrillo
Affiliation:
Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Via Bassini 15, I-20133 Milano, Italy
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Abstract

A two-point boundary-value problem has been formulated that describes the conversion between ordinary (O) and extraordinary (X) wave modes in a cold inhomogeneous plasma. Numerical solutions to this problem have been obtained for various values of the WKB parameter k0L; where k0 is the vacuum wavenumber and L the density-gradient scale length. The results are compared with three different theoretical expressions for the O-X mode conversion efficiency derived by others in the WKB limit of k0 L ≫ l. Most of the results presented in this paper are obtained for a collisionless plasma with finite density near the plasma cut-off density. However, some examples are also given of wave propagation from vacuum. In these examples, collision effects are added to the equations in order to remove the singularity otherwise present at the position of the upper hybrid resonance layer.

Type
Research Article
Information
Journal of Plasma Physics , Volume 39 , Issue 2 , April 1988 , pp. 319 - 337
Copyright
Copyright © Cambridge University Press 1988

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