Development of the Concept of High-Power Microwave Oscillators with Phase Locking by an External Signal

Sharypov, K. A.; Shunaĭlov, S. A.; Zotova, I. V.; Romanchenko, I. V.; Rostov, V. V.; Ul’masculov, M. R.; Shpak, V. G.; Yalandin, M. I.

doi:10.1007/s11141-020-09990-2

Cited by 4 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aside from the operation as a simple BWO, our system offers the possibility to feed a locking signal. This makes it possible to operate a phase-locked oscillator instead of a freerunning oscillator [29], [30], [31]. Due to the high frequency stability requirements of many spectroscopy applications, this could be an important feature.…”

Section: Backward Wave Oscillatormentioning

confidence: 99%

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Marek

Avramidis

Illy

et al. 2020

IEEE Trans. Electron Devices

View full text Add to dashboard Cite

A new type of high-power pulsed source in the millimeter and sub-millimeter frequency range, utilizing the method of passive mode locking, was proposed in 2015 by the Institute of Applied Physics (IAP-RAS) in Nizhny Novgorod. This principle, well known from laser physics, allows the generation of a periodic series of powerful, coherent, ultra-short pulses. In the millimeter and sub-millimeter wavelength range this can be realized using an amplifier and a saturable absorber coupled in a feedback loop. For the coupling of the two devices, a sophisticated feedback system is required. Such a system, based on simple overmoded waveguide components, was previously proposed by the authors. The present article shows how the proposed feedback system can be extended, allowing for a wide range of possible operation regimes for two coupled gyro-devices. Particularly noteworthy is the application of the modified feedback system for the realization of a two-stage amplifier in the sub-THz range. Furthermore, it seems to be possible to use two helical gyrodevices coupled in the proposed way as a source of coherent pulses, as a free-running or locked CW source, and as a twostage amplifier. In all cases, no design changes of the feedback system are required. Index Terms-sub-THz, high power, ultra-short pulses, passive mode locking, feedback system, quasi-optical.

show abstract

Section: Backward Wave Oscillatormentioning

confidence: 99%

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Marek

Avramidis

Illy

et al. 2020

IEEE Trans. Electron Devices

View full text Add to dashboard Cite

show abstract

“…A critical issue for the coherent power summation is phase and frequency locking. Both injection locking [4,6,10,14,[17][18][19] and peer-to-peer locking [2][3][4][7][8][9]20,21] techniques have been widely studied. The injection locking [22,23] and peer-to-peer [24] locking of gyrotrons is currently a subject of active investigation.…”

Section: Introductionmentioning

confidence: 99%

Theory of Peer-to-Peer Locking of High-Power Gyrotron Oscillators Coupled with Delay

Adilova

Ryskin

2022

Electronics

View full text Add to dashboard Cite

Peer-to-peer locking is a promising way to combine the power of high-power microwave oscillators. The peer-to-peer locking of gyrotrons is especially important because arrays of coupled gyrotrons are of special interest for fusion and certain other applications. However, in case of coupled microwave oscillators, the effect of delay in coupling is very significant and should be taken into account. In this article, we present the model of two delay-coupled gyrotrons. We develop an approximate theory of phase locking based on the generalized Adler’s equation, which allows for the treatment of in-phase and anti-phase locking modes. We also present a more rigorous bifurcation analysis of phase locking by using XPPAUT software under the limitation of small delay time. The structure of the phase-locking domains on the frequency-mismatch–coupling-strength plane of parameters is examined. Finally, we verify the results by numerical simulations in the case of finite delay time. The simulations reveal various regimes, including peer-to-peer locking, the suppression of one gyrotron by another, as well as the excitation of one gyrotron by another.

show abstract

Multi-pass relativistic traveling-wave tube with simultaneous operation on symmetric and asymmetric modes

et al. 2020

View full text Add to dashboard Cite

The advantages of using symmetrical and asymmetric eigenmodes of a slow-wave system (SWS) in a relativistic traveling-wave tube (TWT) with multi-pass amplification are discussed. The nonlinear theory of such a TWT amplifier is developed. The parameters of the SWS of the Ka-band TWT amplifier based on a combination of the lower symmetric E01 mode and the asymmetric hybrid HE11 mode are calculated. The calculated efficiency of the amplifier reaches 28% with a gain of about 40 dB. The results of the calculations are confirmed by 3D particle-in-cell (PIC) simulation, in which an output power of 200 MW and a total gain of about 40 dB are obtained when the amplifier is driven by a 500 keV/2 kA hollow electron beam with a total pulse duration of 25 ns. Amplification of short millimeter-wave pulses is also demonstrated in PIC simulations, in which an output peak power of about 180 MW with a pulse duration of the order of 1 ns is obtained.

show abstract

Development of the Concept of High-Power Microwave Oscillators with Phase Locking by an External Signal

Cited by 4 publications

References 24 publications

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Theory of Peer-to-Peer Locking of High-Power Gyrotron Oscillators Coupled with Delay

Multi-pass relativistic traveling-wave tube with simultaneous operation on symmetric and asymmetric modes

Contact Info

Product

Resources

About