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The Physical Limitations of the Efficiency of High Power Multibeam Klystrons

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Moscow University Physics Bulletin Aims and scope

Abstract

Three-dimensional simulation of the motion of a multibeam electron flow in high power multibeam klystrons for high values of the efficiency (70\(\%\) and higher) is necessary. The value of the efficiency calculated earlier in terms of the one-dimensional and two-dimensional models only for one partial beam is higher than that experimentally measured, usually by 10–15\(\%\) of the absolute value. An increase in the number of partial beams and a transversely developed configuration of ring cavities (an ‘‘oversized’’ cavity), as a rule, lead to an increase in the inhomogeneity of the microwave field distribution along the drift tubes of the ring cavity and generate a phase difference of microwave fields (phase incursions).

It is shown here that energy extraction even from identical electron bunches of a multibeam flow depends on the location of the partial drift tube relative to the energy output. The use of the BAC method of electron bunching can increase the efficiency of klystrons. The results of 3D simulation of the interaction of a multibeam electron flow in the output ring cavity of a BAC-klystron with an output pulse power of 6 MW have made it possible to estimate quantitatively the influence of the phase incursions of the waves. It has been shown that the phase difference of the microwave fields in the output cavity significantly reduces the interaction efficiency and, consequently, the efficiency of multibeam klystrons. Thus, the phase delay of the waves excited in different drifts tubes of the gap of an ‘‘oversized’’ output ring cavity is one of the physical reasons for limitation of the efficiency of multibeam klystrons.

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ACKNOWLEDGMENTS

The authors are grateful to I.A. Guzilov and O.V. Gerashchenko for a detailed discussion of the materials of this paper and for useful remarks that allowed us to significantly improve it.

Funding

This work was supported by the Basic and applied research in the domain of digital quantum technologies, photonics, and microelectronics Scientific school.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    R. V. Egorov & V. L. Savvin

  2. R&P Enterprise Toriy, 119991, Moscow, Russia

    B. V. Prokofiev & A. V. Konnov

Authors
  1. R. V. Egorov
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  2. V. L. Savvin
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  3. B. V. Prokofiev
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  4. A. V. Konnov
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Corresponding authors

Correspondence to R. V. Egorov or B. V. Prokofiev.

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Translated by E. Smirnova

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Egorov, R.V., Savvin, V.L., Prokofiev, B.V. et al. The Physical Limitations of the Efficiency of High Power Multibeam Klystrons. Moscow Univ. Phys. 75, 451–458 (2020). https://doi.org/10.3103/S0027134920050094

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