High-harmonic gyrotron with sectioned cavity

Bandurkin, I. V.; Kalynov, Yu. K.; Savilov, A. V.

doi:10.1063/1.3449593

Cited by 47 publications

(9 citation statements)

References 16 publications

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“…3(b)]. Having reverted to the third-harmonic LOG, one should notice that the measured efficiency in this experiment (less than 1%) is significantly lower than the expected efficiency (several percent [11]). The reason is that the profile of the sectioned cavity had been designed for the operation at a frequency of 1 THz (λ = 0.3 mm), whereas the wavelength of the excited mode was longer, λ ≈ 0.4 mm.…”

Section: Resultsmentioning

confidence: 78%

“…Fig. 1 shows results of numerical simulations of the third-harmonic LOG at a current of 0.5 A and the average pitch-factor 1.55 provided on the basis of the formalism described in [11]. At the optimal value of the magnetic field, the lowest axial mode is established.…”

Section: Resultsmentioning

confidence: 99%

“…However, in the first experiment, we used the closed variant, as it was easier to create and less sensitive to manufacturing errors. According to the analysis described in [11], the closed section was designed so that the excitation of parasitic modes at the fundamental and the second cyclotron harmonics should be absent within the range of the magnetic field (close to 13.6 T), which was optimal for the operation at the third-harmonic mode TE 3,7 . Indeed, the excitation of lowharmonic modes at the operation magnetic fields was absent.…”

Section: Resultsmentioning

confidence: 99%

“…1 was designed to improve the operation of the 1-THz third-harmonic gyrotron at the TE 3,7 operating mode [11]. Although it is very long (its total length is over 40 wavelengths), its diffraction Q factor is not extremely high, as the combined length of the input and output near-cutoff sections, L 1 + L 3 , is <20 wavelengths.…”

Section: Methodsmentioning

confidence: 99%

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Experimental Realization of the High-Harmonic Gyrotron Oscillator With a Klystron-Like Sectioned Cavity

Bandurkin

Kalynov

Savilov

2015

IEEE Trans. Electron Devices

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High-harmonic terahertz-frequency-range gyrotrons require long-length operating cavities due to both weak electron-wave coupling and relatively low electron currents. Since diffraction Q-factors of such cavities are very high, a great share of the radiated RF power is spent to ohmic losses. A sectioned klystron-like cavity was proposed as a way to combine a long electron-wave interaction region with a relatively low diffraction Q-factor. In this brief, results of the first experiment under the high-harmonic gyrotron with the klystron-like cavity are reported. In this experiment, selective operation of the gyrotron at the second (0.55 THz) and the third (0.74 THz) cyclotron harmonics has been observed.Index Terms-Large-orbit gyrotron (LOG), terahetrzfrequency-range electromagnetic radiation.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Realization of the High-Harmonic Gyrotron Oscillator With a Klystron-Like Sectioned Cavity

Bandurkin

Kalynov

Savilov

2015

IEEE Trans. Electron Devices

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“…According to calculations [27], using the sectioned electrodynamic system in the already realized pulsed 1-THz third-harmonic LOG [16] should increase several times the output power and significantly decrease ohmic losses. In this system, the spurious oscillations inside the closed drift section of the operating waveguide are avoided due to selective properties of the axis-encircling electron beam, a relatively low electron current, and a short length of the section.…”

Section: Capabilities For Power Enhancementmentioning

confidence: 99%

Terahertz Gyrotrons at IAP RAS: Status and New Designs

Bratman

Glyavin

Kalynov

et al. 2010

J Infrared Milli Terahz Waves

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Powerful gyrotrons with radiation frequencies in the range 0.33-0.65 THz were demonstrated at the IAP as early as in the 1970-1980s. This trend has recently been renewed in connection with a significant increase in interest in terahertz frequency range. In the course of new experiments, the radiation frequency of pulsed gyrotrons was increased up to 1.3 THz and 1 THz at the fundamental and third cyclotron harmonics, respectively. In addition, gyrotrons operated in CW regime with a frequency of 0.3 THz for technological applications (in collaboration with the University of Fukui, Japan) and 0.26 THz for the dynamic nuclear polarization at a high-field NMR were implemented. Designs of a pulsed fundamental-harmonic gyrotron with MW-level power at 0.3 THz and a CW kW-level third-harmonic gyrotron with a frequency of 0.4 THz are currently developed. Estimates show that modern techniques for the creation of strong magnetic fields now make it possible to realize gyrotrons with an operating frequency at least up to 1-1.5 THz. Such generators utilize a relatively low particle energy and can provide higher average power than the existing FELs.

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Improvement of Mode Selectivity of High-Harmonic Gyrotrons by Using Operating Cavities with Short Output Reflectors

Oparina

Savilov

2018

J Infrared Milli Terahz Waves

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High-harmonic gyrotron with sectioned cavity

Cited by 47 publications

References 16 publications

Experimental Realization of the High-Harmonic Gyrotron Oscillator With a Klystron-Like Sectioned Cavity

Experimental Realization of the High-Harmonic Gyrotron Oscillator With a Klystron-Like Sectioned Cavity

Terahertz Gyrotrons at IAP RAS: Status and New Designs

Improvement of Mode Selectivity of High-Harmonic Gyrotrons by Using Operating Cavities with Short Output Reflectors

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