Two-Wave Cherenkov Oscillator With Moderately Oversized Slow-Wave Structure

Rostov, V. V.; Gunin, A. V.; Tsygankov, R. V.; Romanchenko, I. V.; Yalandin, M. I.

doi:10.1109/tps.2017.2773661

Cited by 56 publications

(11 citation statements)

References 38 publications

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“…In addition, shortening the voltage rise decreases the microwave oscillator transit time [11] and increases the efficiency of the beam-to-wave energy conversion [13,14]. Finally, constant beam parameters within the pulse plateau are needed for mode selection, especially in oversized slow wave structures, where one mode should dominate over competitors for as long as possible [15,16]. The advantages of drivers with distributed PFLs were proved, even by the first experiments on millimeter-wavelength relativistic oscillators [17,18] and, later, on Ka, X, and S-band repetitively pulsed backward wave oscillators [5,[12][13][14][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

High-Voltage Drivers Based on Forming Lines with Extended Quasi-Rectangular Pulses for High-Power Microwave Oscillators

et al. 2022

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The paper considers such modifications of an ordinary pulse-forming line (PFL) as double-width and triple-width forming lines (DWFL, TWFL) built around the PFL by nesting one and two additional uncharged lines, respectively, into its free volume inside the inner conductor of the PFL. The theoretical analysis is supported by simulation and experimental data, showing that the TWFL provides a 3-fold increase in the voltage pulse width and that it can be further increased by an arbitrary integer factor k. The results of the numerical simulations also show the electric field behavior and other features, including the edge effect in the TWFL. The proposed method opens up new opportunities for designing compact high-power microwace (HPM) sources.

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Section: Introductionmentioning

confidence: 99%

High-Voltage Drivers Based on Forming Lines with Extended Quasi-Rectangular Pulses for High-Power Microwave Oscillators

et al. 2022

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“…As one of the most promising high power microwave (HPM) generators, Cerenkov oscillator has shown great advantages in providing high output power, good tunability and compact structure [1]- [4]. A great deal of effort has been made on the development of Cerenkov devices in the last decades to achieve higher output power, longer pulse duration and higher conversion efficiency for various applications, especially in the C-band and X-band [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

Influence of SWS Size on Mode Purification in an Overmoded Ka-Band Cerenkov Oscillator

Teng

Wang

et al. 2020

IEEE Access

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Overmoded slow-wave structure (SWS) plays an important role in developing the performance of Cerenkov oscillators at the millimeter-wave range. To investigate the effect of SWS size on power capacity as well as the problem of mode competition, the properties of the resonance modes in an overmoded SWS are focused on. Based on the mode selection method of enhancing the field of TM 01 and keeping the field of TM 02 mode steady, the output results for SWSs with various sizes are studied. Consequently, the size of SWS is reasonably determined, which can provide an effective beam-wave interaction process and the purified output mode. Moreover, the study on electron's movement in the diode area under the magnetic field of 0.8 T is conducted and then the value of the overmoded ratio α is finally confirmed as 2.5 to guarantee a lossless transportation of the electron beam. Verified by the particle-in-cell (PIC) simulations, the optimized structure shows a good capability of improving the output power and purifying the output mode.

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“…The relativistic backward wave oscillator (RBWO) is considered to be one of the most promising high power microwave (HPM) generators due to its compact structure [1], [2], high conversion efficiency [3], [4], high tunability [5], [6] and the ability of repetitive-rate operation [7], [8]. As the high power microwave (HPM) technology has matured gradually [9], [10], increasing the output power in the low magnetic field has been a leading tendency in the development of RBWO [11]- [14], especially when the generated wavelength goes into high frequency range such as Ka-band [15], [16].…”

Section: Introductionmentioning

confidence: 99%

“…in the high frequency band [19], [20]. The power handling capacity is mainly limited by the internal RF breakdown induced by the intensive electric field on the surface of the corrugated waveguide [4], [21]. Second, the low guide magnetic field is likely to weaken the confinement of the electron beam.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, TM 01 always works as the operation mode in RBWO [11], [26]. In these RBWOs, some of them adopt the sinusoidal ripple as shown in FIGURE 1 (a) [27], [28], while the others employ the improved rectangular ripple with semicircle on its top as shown in FIGURE 1 (b) [4], [26]. And in some of these RBWOs the electron beam interacts synchronously with the −1st spatial harmonic [29], [30], while in the others the electron beam interacts synchronously with the fundamental harmonic [31], [32].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Research on Properties of Spatial Harmonics in Corrugated Waveguide

Teng

Wang

et al. 2019

IEEE Access

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This paper investigates the dependence of the properties of the spatial harmonics on the overmoded ratio of the corrugated waveguide operating in TM 01 at 30 GHz with the consideration of the effects of the ripple shape. It is found that as the overmoded ratio grows, the electric fields concentrate towards the ripple surface, which weakens the enhancement of the power handling capacity caused by augmentation of the overmoded ratio. As the overmoded ratio grows, the ratio between the field amplitudes of the −1st spatial harmonic and the fundamental harmonic increases monotonically. Therefore, the total electric fields composed of the spatial harmonics become the spatial beating-wave with the single frequency, whose amplitudes vary along z-axis with the spatial period determined mainly by the −1st spatial harmonic and the fundamental harmonic. Researches on coupling impedances show that with the same overmoded ratio, the corrugated waveguide consisting of the improved rectangular ripples provides better synchronous coupling for the wave-beam interaction than that of the sinusoidal ripples does. Moreover, it is better to choose the fundamental harmonic close to the light line as the synchronous wave for the wave-beam interaction in the low magnetic field. In that case, even if the electron beam keeps far away from the ripple surface, the synchronous wave still provides strong enough coupling for the electron beam. INDEX TERMS Corrugated waveguide, coupling impedance, field distribution, high power microwave generation, overmoded ratio.

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Two-Wave Cherenkov Oscillator With Moderately Oversized Slow-Wave Structure

Cited by 56 publications

References 38 publications

High-Voltage Drivers Based on Forming Lines with Extended Quasi-Rectangular Pulses for High-Power Microwave Oscillators

High-Voltage Drivers Based on Forming Lines with Extended Quasi-Rectangular Pulses for High-Power Microwave Oscillators

Influence of SWS Size on Mode Purification in an Overmoded Ka-Band Cerenkov Oscillator

Theoretical Research on Properties of Spatial Harmonics in Corrugated Waveguide

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