A high-power periodic nanosecond pulse source of coherent 8-cm electromagnetic radiation

Afanas’ev, K. V.; Bykov, N. M.; Gubanov, V. P.; Elchaninov, A. A.; Klimov, A. I.; Korovin, S. D.; Rostov, V. V.; Степченко, А. С.

doi:10.1134/s1063785006110058

Cited by 33 publications

(11 citation statements)

References 3 publications

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“…S-band [26] and X-band [27] SR experiments demonstrated high stability of pulse-to-pulse phase distribution of the radiation. The root-mean-square (RMS) phase deviation on the time scale is found to approximate the rise time dispersion of the supply voltage.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 93%

“…The results [26]- [28] let rise to investigations of advanced HPM systems like phased antenna arrays on the basis of X-band SR BWOs without electrodynamic coupling [29], [30]. As in [31], SR BWOs are capable of operating at high-pulse repetition rates and demonstrating stability of both microwave pulse amplitude and shape.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 97%

“…Section I describes the theoretical and experimental studies of Cherenkov mechanisms of SR in the process of interaction of an electron bunch with a backward wave. Recent experiments with phase synchronization of several SR pulse generators [26]- [32] are also discussed. Section II describes the simulation and experimental observation of amplification of SR pulses during propagation along quasi-stationary electron beams [33], [34].…”

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confidence: 99%

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Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract-Superradiance (SR) of electron bunches can be considered an effective method of production of ultrashort electromagnetic pulses. Different types of SR associated with different mechanisms (cyclotron, Cherenkov, and bremsstrahlung) of stimulated emission are observed experimentally in the millimeter and centimeter wavelength bands. Progress in this research has enabled a new type of generator to be created capable of generating unique short (under 200-300 ps) electromagnetic pulses at super high peak powers exceeding 1 GW in the millimeter and 3 GW in the centimeter waveband. Some new methods for further increasing of the SR pulse peak power along with the promotion of such sources to higher frequency bands are discussed. These new methods include phase synchronization of several SR pulse generators, the amplification of an SR pulse during its propagation along a quasi-stationary electron beam and nonlinear compression in the process of induced selftransparency.

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Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 93%

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 97%

mentioning

confidence: 99%

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Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

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“…Until now, SR pulses whose peak power exceeds the power of a feeding electron beam have been obtained [34][35][36][37][38]. Simultaneously, improving the accelerator technique allowed one to realize regimes of periodic repetition of SR pulses with high (kilohertz) clock rate [17,19,[39][40][41][42][43][44]. The modern state-of-the-art of this class of oscillators is analyzed in Sec.…”

Section: Introductionmentioning

confidence: 99%

Generation of high-power ultrashort electromagnetic pulses on the basis of effects of superradiance of electron bunches

Zotova

Pegel

Rostov

et al. 2007

Radiophys Quantum El

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One of the promising methods for generation of ultrashort electromagnetic pulses (with duration of about ten periods of high-frequency oscillations) is radiation from spatially localized electron ensembles (bunches), which can be considered a classical analog of Dicke superradiance known in quantum electronics. In classical electronics, superradiance can be related to various mechanisms of stimulated radiation. Until now, cyclotron, undulator, andČerenkov (in the case of interaction with both copropagating and counterpropagating waves) superradiance of electron bunches as well as superradiance during stimulated scattering of a pump wave have been studied theoretically and experimentally. As a result of these studies based on high-current RADAN and SINUS accelerators and their modifications, a new class of oscillators producing pulsed electromagnetic radiation has been created. They have such unique characteristics as pulses of high peak power (up to 1 GW and 3 GW in the millimeter-and centimeter-wave ranges, respectively) and ultrashort duration (from 300 ps to 1 ns, respectively). In this case, regimes with a peak radiation power exceeding the electron-beam power are experimentally realized. Regimes with high (kilohertz) pulse repetition rate and high average power (up to 2.5 kW) are obtained.

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“…With allowance for possible frequency deviation δω (ω is the carrying frequency) during time τ m from pulse to pulse, it is necessary to satisfy the con ditions (3) where δϕ in is the initial phase instability [5]. Due to the relativistic energy dependence of the electron velocity at small variations of the amplitude of pulse voltage (δU 0 /U 0 < 1%), conditions (3) can be fulfilled if the shape of the pulse is reproduced quite stable.In contrast to [1][2][3][4][5], the main aim of this work is to verify the possibility of the phase stabilization of microwave radiation in experiments with a generator frequency of 1-2 GHz and pulse duration τ m = 100T and without making the voltage impulse front sharper. In a frequency range of 1-2 GHz, it is worthwhile to use the RBWO construction based on a coaxial delay system (CRBWO) [7].…”

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confidence: 99%

On the radiation phase stability of a relativistic coaxial backward-wave oscillator at decimeter wavelengths

et al. 2015

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creating multichannel systems consisting of one type parallel devices excited by a common power supply. As a result, it is possible to obtain strong directional radiation with an increasing maximum density of power flux being proportional to N 2 , where N is the number of elements in the system. The possibility of obtaining a stable phase of micro wave radiation (from pulse to pulse) achieved at a suf ficiently rapid growth of voltage U(t) across the diode forming the beam has been proven in the case of a rel ativistic backward wave oscillator (RBWO) with an electrodynamic system based on a round corrugated wave guide [1]. This system operates in the mode of superhigh radiance at a carrying frequency of 3.7 GHz and a relatively short microwave pulse of 3 ns. Stability of the radiation phase was also observed in the RBWO experiments at frequencies of 10 [2, 3] and 37 GHz [4,5]. Special devices were used in these experiments in obtaining a sharper front of voltage pulse in order to satisfy the theoretical condition of phase stabilization [5,6] (1)where T is the period of high frequency oscillations and C = [eI 0 Z/(2mc 2 )] 1/3 is the generalized Pierce parameter. In the latter formula, I 0 is the amplitude of an electron beam current; Z is its connective resistance with synchronous harmonics of the operating wave; e and m are the electron charge and mass, respectively; and γ 0 is the relativistic factor relating to diode voltage amplitude U 0 . Temporal factor T U is determined through the maximal derivative at the front of the volt age pulse and its amplitude,When condition (1) is satisfied, the growth duration of the beam current determined analogously to (2) cer tainly has a lesser magnitude [5]. The spectral compo nents from the front of a current then have weakly vari able phases in the frequency band of interaction [6]. Therefore, condition (1) is necessary when obtaining a fixed initial phase (ϕ in = const) of the microwave radi ation pulse from one pulse to another. For excitation of parallel generators, this phase should be the same in each pulse. With allowance for possible frequency deviation δω (ω is the carrying frequency) during time τ m from pulse to pulse, it is necessary to satisfy the con ditions (3) where δϕ in is the initial phase instability [5]. Due to the relativistic energy dependence of the electron velocity at small variations of the amplitude of pulse voltage (δU 0 /U 0 < 1%), conditions (3) can be fulfilled if the shape of the pulse is reproduced quite stable.In contrast to [1][2][3][4][5], the main aim of this work is to verify the possibility of the phase stabilization of microwave radiation in experiments with a generator frequency of 1-2 GHz and pulse duration τ m = 100T and without making the voltage impulse front sharper. In a frequency range of 1-2 GHz, it is worthwhile to use the RBWO construction based on a coaxial delay system (CRBWO) [7]. This is caused by the small dimensions of the electrodynamic system of the gen erator (D/λ < 1, L = 1.5λ, where D and L are the aver age di...

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A high-power periodic nanosecond pulse source of coherent 8-cm electromagnetic radiation

Cited by 33 publications

References 3 publications

Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Generation of high-power ultrashort electromagnetic pulses on the basis of effects of superradiance of electron bunches

On the radiation phase stability of a relativistic coaxial backward-wave oscillator at decimeter wavelengths

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