Efficient Excitation of Hybrid Modes in a THz Clinotron

Various regimes of hybrid, bulk-surface , modes being excited in the clinotron oscillator with a sheet electron beam and nonuniform grating have been studied theoretically. It is shown that higher output power of the hybrid mode in comparison with pure surface or bulk modes is due to an increase of...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2021-06, Vol.42 (6), p.671-683
Main Authors: Khutoryan, Eduard, Kuleshov, Alexei, Ponomarenko, Sergey, Lukin, Konstantin, Tatematsu, Yoshinori, Tani, Masahiko
Format: Article
Language:English
Subjects:
Classical Electrodynamics
Electrical Engineering
Electron beams
Electronics and Microelectronics
Electrons
Engineering
Hybrid modes
Instrumentation
Waveguides
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Summary:Various regimes of hybrid, bulk-surface , modes being excited in the clinotron oscillator with a sheet electron beam and nonuniform grating have been studied theoretically. It is shown that higher output power of the hybrid mode in comparison with pure surface or bulk modes is due to an increase of a feedback and efficiency of the radiation output caused by radiating harmonic and due to high coupling factor caused by the surface harmonic. 2D PIC simulations predicted output power of dozens of Watts in 0.5–0.7 THz range provided by the 0.2 A, 17 kV beam with the output efficiency of up to 1%. The simulated frequency tuning range was about 5%. Mode competition has been discussed, in particular; it is shown that single or two mode operation, hysteresis effect, etc. are controlled by the waveguide height.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-021-00800-y