Journal of Radio Electronics. eISSN 1684-1719. 2025. ¹10

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DOI: https://doi.org/10.30898/1684-1719.2025.10.8

 

 

 

Multi-beam gyrotrons with nested cavities

 

M.Yu. Glyavin 1, A.S. Zuev 1, V.N. Manuilov 1,2, V.A. Skalyga 1

 

1 A.V. Gaponov-Grekhov IAP RAS, 603950, Russia, Nizhny Novgorod, 46 Ul'yanov Street

2 Lobachevsky State University, 603022, Russia, Nizhny Novgorod, 23 Prospekt Gagarina

 

The paper was received July 15, 2025.

 

Abstract. Some applications require powerful multi-frequency sources in the centimeter and millimeter wavelength range. In particular, an additional signal is required in ECR sources of multiply charged ions to suppress cyclotron plasma instabilities. The paper proposes a concept of a double-beam technological gyrotron that provides two-frequencies output radiation at 28 GHz with a power of up to 10 kW for ECR plasma heating and at 14.4 GHz with a power of up to 6 kW for plasma stabilization. The possibility of radiation at two frequencies is realized by using an original electrodynamic system with nested cavities. This approach makes it possible to get a radiation source at close frequencies when operating at one cyclotron harmonic and/or at multiple frequencies when operating at different harmonics. Various combinations of electron-optical and electrodynamic gyrotron subsystems are possible in combination with standard or complex magnetic systems. Designs of a new type of gyrotron and concepts of a double-beam electron-optical system, double-beam EOS, are discussed. One of the promising concepts is an electron-optical system with counter-propagating electron beams, in which the first beam is formed by a standard magnetron-injection gun (MIG), and the second beam by an inverted MIG. Another promising modification is the introduction of several electron beams into one or each cavity for mode selection or multi-frequency operation. The EOS modifications with voltage regulation on electrodes are attractive for beam parameter control. In addition, separate heating of each emitter in some EOS concepts allows to independently switched on/off any of the beams during the operation. Another promising modification is the introduction of an additional solenoid, located in the bore of the main magnetic system, which allows changing the frequency ratio of the output signal. The considered gyrotron concepts require the use of magnetic systems with a large bore.

Key words: gyrotron, high cyclotron harmonic, magnetron-injection gun, electron beams.

Financing: The work was carried out with the financial support of projects FFUF-2022-0007.

Corresponding author: Zuev Andrey Sergeevich, andrey.zuev@ipfran.ru

 

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For citation:

Glyavin M.Yu., Zuev A.S., Manuilov V.N., Skalyga V.A. Multi-beam gyrotrons with nested cavities // Journal of Radio Electronics. – 2025. – ¹. 10. https://doi.org/10.30898/1684-1719.2025.10.8 (In Russian)