Gyrotrons with echelette resonators

Vlasov, S. N.; Koposova, E. V.; Pavel'ev, A.B.; Khizhnyak, V. I.

doi:10.1007/bf02122392

Cited by 16 publications

(8 citation statements)

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“…In the echelette cavity, the presence of a stepwise wall with step height equal to approximately λ/2 ensures high selection of modes since modes with another wavelength are weakly resonant in such a system [6][7][8]. It was mentioned in [6][7][8] that the Q-factor of the operating mode in echelette cavities can significantly be reduced compared with condition (1) with the preservation of a fairly high selectivity with respect to both longitudinal and transverse indices.…”

Section: Institute Of Appliedmentioning

confidence: 95%

“…It was mentioned in [6][7][8] that the Q-factor of the operating mode in echelette cavities can significantly be reduced compared with condition (1) with the preservation of a fairly high selectivity with respect to both longitudinal and transverse indices. The results of theoretical and experimental studies of echelette-cavity gyrotrons show that such devices ensure the diminishing of the diffraction Q-factor with the preservation of sufficient selection.…”

Section: Institute Of Appliedmentioning

confidence: 97%

“…The efficiency of gyrotrons with echelette and CCMC cavities at high modes was fairly small [3,6,7]. One reason is that theoretical knowledge of such cavities is insufficient.…”

Section: Institute Of Appliedmentioning

confidence: 99%

“…The results of theoretical and experimental studies of echelette-cavity gyrotrons show that such devices ensure the diminishing of the diffraction Q-factor with the preservation of sufficient selection. In the echelette-cavity gyrotron operated at the second harmonic of the gyrofrequency (at the wavelength λ = 1.6 mm), an output power P ≈ 100 kW was experimentally obtained in the submillisecond-pulse system [6].…”

Section: Institute Of Appliedmentioning

confidence: 99%

“…1 The present paper is devoted to a theoretical study of gyrotrons with such multistage cavities. Earlier variants and particular types of such cavities are, on the one hand, coupled cavities with mode conversion (CCMC) [3,5] and, on the other hand, cavities of echelette type [6][7][8]. The profiles of these cavities * vlasov@hydro.appl.sci-nnov.ru 1 Of course, this notion can be extended to a more general class of similar electrodynamic structures.…”

Section: Introductionmentioning

confidence: 97%

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Axisymmetric multistage cavity resonators

Vlasov

Zavolsky

Zapevalov

et al. 2009

Radiophys Quantum El

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We study theoretically multistage cavity resonators as well as the gyrotrons manufactured on their basis. Coupled cavities with mode conversion and echelette cavities are particular cases of such devices. The possibilities of reducing the diffraction Q-factor of the operating mode of a cavity, with the preservation of its selective properties and significant increase in the gyrotron radiation power, and provision of high efficiency and acceptable heat ohmic load of the cavity at the first harmonic of the gyrofrequency are considered. Achievable parameters of the gyrotrons at the second and third harmonics with typical electron guns and cryomagnetic systems are analyzed.

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Section: Institute Of Appliedmentioning

confidence: 95%

Section: Institute Of Appliedmentioning

confidence: 97%

“…The efficiency of gyrotrons with echelette and CCMC cavities at high modes was fairly small [3,6,7]. One reason is that theoretical knowledge of such cavities is insufficient.…”

Section: Institute Of Appliedmentioning

confidence: 99%

Section: Institute Of Appliedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Axisymmetric multistage cavity resonators

Vlasov

Zavolsky

Zapevalov

et al. 2009

Radiophys Quantum El

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State-of-the-Art of High-Power Gyro-Devices and Free Electron Masers

Thumm

2020

J Infrared Milli Terahz Waves

296

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STATE-OF-THE-ART OF HIGH POWER GYRO-DEVICES AND FREE ELECTRON MASERSAt present, gyrotron oscillators are mainly used as high power millimeter wave sources for electron cyclotron resonance heating (ECRH) and diagnostics of magnetically confmed plasmas for generation of energy by controlled thermonuclear fusion. 140 GHz gyrotrons with output power Pout = 0.58 MW, pulse length 't = 2.0 s and efficiency 11 = 34 % are commercially available. Diagnostic gyrotrons deliver P out = 40 kW with 't = 40 J-lS at frequencies up to 650 GHz (11 2_ 4 %). Recently, gyrotron oscillators have also been successfully used in matedal processing and plasma chemistry. Such technological applications require gyrotrons with the following parameters: f 2. 28 GHz , Pout = 10-30 kW, CW, 11 2. 30 %. This paper reports on achievements and problems related to the development of very high power mm-wave gyrotrons for long pulse or CW operation and describes the microwave technological pecularities of the different development steps. In addition, this work gives a short overview of the present development of gyrotrons for technological applications, quasi-optical gyrotrons, cyclotron autoresonance masers (CARMs), gyro-ldystrons, gyro-TWT amplifiers, gyro-BWO's and free electron masers (FEMs). The most impressive FEM output parameters are: Pout = 2GW, 't = 20 ns, 11 = 13 % at 140 GHz (LLNL) and Pout = 15 kW, 't = 20 J-tS, 11 = 5 % in the range from 120 to 900 GHz (UCSB). ENTWICKLUNGSSTAND VON HOCHLEISTUNGS-GYRO-RÖHREN UND FREI-ELEKTRONEN-MASERN Übersiebt Gyrotronoszillatoren werden derzeit vorwiegend als Hochleistungsmillimeterwellenquellen für die Elektron-Zyklotron-Resonanzheizung (ECRH) und Diagnostik von magnetisch eingeschlossenen Plasmen zur Erforschung der Energiegewinnung durch kontrollierte Kernfusion eingesetzt. 140 GHz Gyrotrons mit einer Ausgangsleistung von Pout = 0.58 MW bei Pulslängen von 't = 2.0 s und Wirkungsgraden von • 11 = 34% sind kommerziell erhältlich. Gyrotrons zur Plasmadiagnostik erreichen Frequenzen bis zu 650 GHz bei P out = 40 kW und 't = 40 ~-ts (11 2. 4 %). In jüngster Zeit jedoch finden Gyrotronoszillatoren auch für technologische Prozesse und in der Plasmachemie erfolgreich Verwendung. Dabei werden Röhren mit folgenden Parametern eingesetzt: f 2_ 28 GHz, Pout = 10-30 kW, CW, 11 2. 30 %. In diesem Beitrag wird auf den aktuellen Stand und die Probleme bei der Entwicklung von Hochleistungs-mm-Wellen-Gyrotrons für Langpuls-und Dauerstrichbetrieb sowie auf die mikrowellentechnischen Besonderheiten der einzelnen Entwicklungsphasen eingegangen: Außerdem wird auch kurz über den neuesten Stand der Entwicklung von Gyrotrons für technologische Anwendungen, quasi-optischen Gyrotrons, Zyklotron-Autoresonanz-Masern (CARMs), Gyroklystrons, Gyro-TWT-Verstärkern, Gyro-Rückwärtswellenoszillatoren (BWOs) und Frei-Elektronen-Maser (FEM) berichtet. FEM-Rekordausgangsparameter sind hier: Pout = 2 GW, 't = 20 ns, 11 = 13 % bei 140 GHz (LLNL) und Pout = 15 kW, 't = 20 J-lS, 11 = 5 % im Bereich von 120 bis 900 GHz (UCSB). Contents

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Enhancement of cavity selectivity in relativistic gyrotrons operated at axisymmetric modes

Денисов

Zaitsev

Kuzikov

et al. 2008

Radiophys Quantum El

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Mode selection is a key problem from the viewpoint of maintaining the single-mode generation regime in high-power gyrotrons operated at axisymmetric modes. In this paper, we propose several electrodynamic methods of mode selection, which allow separating the electrically strong axisymmetric higher-order mode from spurious modes. The possibility of suppressing the nearest spurious modes efficiently, by using either wide slits in the cavity, or azimuthal corrugations on the walls of the tapered cavity, is shown. A method of mode selection at cyclotron frequency harmonics is proposed. The results of studying two types of gyrotron cavities experimentally at a low power level confirmed their high selective properties. The cavities were calculated aiming at using them as the basis for creation of a gyrotron operated at the TE 0.3 mode and producing a power of 5-10 MW in 1 µs long pulses at a wavelength of 1 cm.

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Gyrotrons with echelette resonators

Cited by 16 publications

References 1 publication

Axisymmetric multistage cavity resonators

Axisymmetric multistage cavity resonators

State-of-the-Art of High-Power Gyro-Devices and Free Electron Masers

Enhancement of cavity selectivity in relativistic gyrotrons operated at axisymmetric modes

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