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Decrease in the Mode Purity of Microwave Beams in the L-2M Stellarator Peripheral Plasma

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Abstract

The linear coupling (transformation) of two wave modes in a peripheral layer of inhomogeneous plasma confined by a magnetic field is theoretically analyzed. This transformation is a cause of a decrease in the purity of the X-mode introduced into plasma, which is optimum for electron—cyclotron plasma heating at the second harmonic of gyrofrequency. It is shown that the mode purity defect in radiation power under L-2M stellarator conditions can be no more than 6%. An increase in the mode purity defect because of the arbitrarily large steepness of the electron density profile in the peripheral layer appears insignificant.

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Funding

This is one of the studies supported by the State contract “High-Temperature Plasma Physics. Fundamental Problems of Plasma Dynamics, Confinement, and Heating in Three-Dimensional Magnetic Configurations” no. АААА-А19-119121790086-9.

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991, Moscow, 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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Translated by A. Kazantsev

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Tereshchenko, M.A. Decrease in the Mode Purity of Microwave Beams in the L-2M Stellarator Peripheral Plasma. Bull. Lebedev Phys. Inst. 47, 399–404 (2020). https://doi.org/10.3103/S1068335620120167

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  • DOI: https://doi.org/10.3103/S1068335620120167

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