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Propagation of microwave beams through the stagnation zone in an inhomogeneous plasma

  • Oscillations and Waves in Plasma
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Abstract

A study is made of the microwave beam evolution due to passing through the stagnation zone, where the group velocity vanishes, thus making the paraxial approximation for the wavefield inappropriate. An extension to the standard beam tracing technique is suggested that allows one to calculate the microwave beam parameters on either branch of its path apart from the stagnation zone, omitting the calculation of the wavefield inside it. Application examples of the extended technique are presented for the case of microwave reflection from the upper hybrid resonance layer in a tokamak plasma.

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    M. A. Tereshchenko

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  1. M. A. Tereshchenko
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Correspondence to M. A. Tereshchenko.

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Original Russian Text © M.A. Tereshchenko, 2017, published in Fizika Plazmy, 2017, Vol. 43, No. 1, pp. 9–20.

The article was translated by the author.

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Tereshchenko, M.A. Propagation of microwave beams through the stagnation zone in an inhomogeneous plasma. Plasma Phys. Rep. 43, 18–28 (2017). https://doi.org/10.1134/S1063780X17010123

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  • DOI: https://doi.org/10.1134/S1063780X17010123

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