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Problem of Increasing the Operating Frequency in Cherenkov Plasma Sources of Electromagnetic Radiation

  • STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS
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Abstract

We analyze the possibility of increasing the operating frequency of available plasma Cherenkov microwave emitters operating on relativistic high-density electron beams. We consider high- and low-frequency surface waves of a high-density nonmagnetized tubular plasma in a waveguide and determine conditions for their pumping by electron beams. The coefficients of spatial amplification of surface waves in the regimes of one-particle and collective Cherenkov effects are calculated. Nonlinear equation of spatial enhancement of waves are derived, and the efficiencies of surface wave amplification are calculated. It is shown that an increase in the operating frequency of operating plasma emitters by an order of magnitude is quite feasible and can be attained by increasing only the density of the plasma.

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Notes

  1. It is known [18, 22] that the instability and amplification occur only in the case of resonance of a plasma wave with a slow beam wave.

  2. For a very high electron beam density, the factor of closeness of the frequencies of the high- and low-frequency surface waves can become decisive. In this case, the expansion of the left-hand side of dispersion equation (28) to within the terms linear in δk is insufficient. A more complex analysis is required, which will be given in a separate publication.

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ACKNOWLEDGMENTS

The authors are grateful to O.T. Loza, who initiated theoretical investigations, for fruitful discussions and his interest in this research.

Funding

This study was performed under the contract no. 313/1689-D from 16.09.2019 with the State Corporation Rosatom.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    I. N. Kartashov & M. V. Kuzelev

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  1. I. N. Kartashov
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  2. M. V. Kuzelev
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Correspondence to I. N. Kartashov or M. V. Kuzelev.

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Translated by N. Wadhwa

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Kartashov, I.N., Kuzelev, M.V. Problem of Increasing the Operating Frequency in Cherenkov Plasma Sources of Electromagnetic Radiation. J. Exp. Theor. Phys. 134, 235–248 (2022). https://doi.org/10.1134/S1063776122020054

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  • DOI: https://doi.org/10.1134/S1063776122020054

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