X-Band Relativistic BWO-RR With Controlled Microwave Pulse Duration

Totmeninov, E. M.; Gunin, A. V.; Klimov, A. I.; Rostov, V. V.; Степченко, А. С.; Выходцев, П. В.; Mahir, A. H.

doi:10.1109/tps.2012.2189417

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…However, to control R by adiabatically varying the SWS corrugation depth is not an expeditious method. An experiment with a quasi-stationary X-band BWO was performed [29] where the transient time τ tr and the HPM generation time were electronically controlled by varying R(z) through beam profiling [varying r b (z); z ∈ {0, L}]. Considering that a tubular electron beam should propagate along the lines of force of the guide magnetic field (in average, B z ≈ 2 T), it sufficed to vary the proportion between the fields in the beam injector region and in the SWS.…”

Section: Bwo Oscillation Mode Control Capabilitiesmentioning

confidence: 99%

“…Actually, even when the oscillator operates under the conditions that the e-beam and the counter electromagnetic wave are off cyclotron resonance, a rather strong guide magnetic field is required (∼2 T). Therefore, as distinct from the dc magnetic systems of X-band BWOs [29], [30], the radius of the dc solenoid winding of a K a-band oscillator [31] is comparable with the axial length of the beam-wave interaction space; that is, small-scale profiling [varying r b (z)] is difficult to perform. It is much simpler to obtain the required magnetic line topology using a magnetic pulse generator with a properly thin solenoid [32], [33].…”

Section: Bwo Oscillation Mode Control Capabilitiesmentioning

confidence: 99%

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Control of the Operation Mode of a Relativistic <italic>Ka</italic>-Band Backward-Wave Oscillator

Boltachev

Rostov

Sharypov

et al. 2015

IEEE Trans. Plasma Sci.

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Variations in the transient time and in the microwave pulse duration and peak power have been demonstrated for a relativistic subgigawatt K a-band backwardwave oscillator (BWO) with the slow-wave structure geometry, the accelerating voltage, and the electron beam current remained unchanged. This was done taking into account that the BWO operation mode depends on the starting-current-tobeam-current ratio. Efficient variation of the starting current was attained by changing the beam path in view of a significant difference between the times of the guide pulsed magnetic field diffusion into the electron injection region and beam-wave interaction space.

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Section: Bwo Oscillation Mode Control Capabilitiesmentioning

confidence: 99%

Section: Bwo Oscillation Mode Control Capabilitiesmentioning

confidence: 99%

Control of the Operation Mode of a Relativistic <italic>Ka</italic>-Band Backward-Wave Oscillator

Boltachev

Rostov

Sharypov

et al. 2015

IEEE Trans. Plasma Sci.

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“…A pulse duration of 106 ns was obtained by using a combined forming line in the construction of an accelerator including coaxial and spiral sections [8]. The rise time of voltage pulse was 7 ns, and the voltage amplitudes on diode and the diode current were 300 V and 3.6 kA, respectively.…”

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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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Wide-Aperture Liquid Calorimeters for Measuring the Energy of Powerful Microwave Radiation Pulses

Klimov

2019

Russ Phys J

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X-Band Relativistic BWO-RR With Controlled Microwave Pulse Duration

Cited by 11 publications

References 5 publications

Control of the Operation Mode of a Relativistic <italic>Ka</italic>-Band Backward-Wave Oscillator

Control of the Operation Mode of a Relativistic <italic>Ka</italic>-Band Backward-Wave Oscillator

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

Wide-Aperture Liquid Calorimeters for Measuring the Energy of Powerful Microwave Radiation Pulses

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