Enhanced frequency agility of high-power relativistic backward wave oscillators

Moreland, L.D.; Schamiloglu, E.; Lemke, R.W.; Roitman, A.; Korovin, S. D.; Ростов, В. В.

doi:10.1109/27.533088

Cited by 61 publications

(25 citation statements)

References 5 publications

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“…The shift of the shorting plate with respect to the beginning of the periodic structure leads to a phase shift between forward and backward waves as well as to a phase shift between harmonics of each wave. Changing of boundary conditions at the cathode end of the structure may lead to changing of the efficiency of device operation in addition to changing of the operating frequency, similar to the single-mode BWO case studied in [16] and [17]. In fact, it is clear from the nonsinusoidal dependence of mode frequency on reflector position that reflections occur both at the end of the slow wave structure and at the reflector.…”

Section: Eigenmodes Of An Oversized Open Resonator and The Influenmentioning

confidence: 91%

“…Studies of a small diameter backward wave oscillator using a cutoff reflector separated from the beginning of SWS by a smooth waveguide section was described in [16], and the BWO operation as well as a small diameter SWS properties near the point were studied in [17]. It was found that moving the reflector could modify the performance of the device (namely, operating frequency and efficiency).…”

Section: Eigenmodes Of An Oversized Open Resonator and The Influenmentioning

confidence: 99%

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Overmoded GW-class surface-wave microwave oscillator

Vlasov

Shkvarunets

Rodgers

et al. 2000

IEEE Trans. Plasma Sci.

178

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Abstract-Results of theoretical and experimental studies of a GW-class, large diameter microwave oscillator are presented. The device consists of a large cross-section (overmoded), slow-wave structure with a unique profile of wall radius specifically designed to support surface waves and to provide a strong beam-wave coupling at moderate voltage (500 kV), an internal adjustable microwave reflector, a coaxial microwave extraction section, and a coaxial magnetically insulated field emission electron gun. In preliminary experiments carried out at 8.3 GHz, the power level exceeding 0.5 GW and efficiency of 15% have been measured calorimetrically.Index Terms-High-power microwave (HPM), overmoded, surface-wave oscillator.

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Section: Eigenmodes Of An Oversized Open Resonator and The Influenmentioning

confidence: 91%

Section: Eigenmodes Of An Oversized Open Resonator and The Influenmentioning

confidence: 99%

Overmoded GW-class surface-wave microwave oscillator

Vlasov

Shkvarunets

Rodgers

et al. 2000

IEEE Trans. Plasma Sci.

178

View full text Add to dashboard Cite

show abstract

“…Since e and f are negatively related in formula (4), any e at frequency from 5 to 10 GHz is higher than e 10 GHz .…”

Section: Designationmentioning

confidence: 96%

“…Others also studied the efficient approach for backward wave oscillator (BWO) to tune among different bands. 3,4 Despite of the achievements mentioned above, there remain some disadvantages in tuning conveniently and efficiently. For example, the coaxial conductor structure needs to be disassembled repeatedly to realize modulation between only two frequency points.…”

Section: Introductionmentioning

confidence: 97%

A tunable relativistic backward wave oscillator based on changing concentration of the filling dielectric

et al. 2015

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The tunable capability expands the application fields of backward wave oscillator (BWO), especially for large range modulation. This paper presents analysis, PIC simulation, and preliminary design of a novel relativistic BWO which achieves the purpose of modulation among three or more frequencies within two bands. A new dielectric slow-wave structure (SWS) with hollow section was designed in the novel BWO instead of the conventional SWS with fixed solid conductors. The wide range of adjustment of propagation constant and output frequency could be easily achieved by modulating the concentration (permittivity) of the dielectric filled in the hollow section. The results of PIC simulation show the output has three stable situations at two bands with a magnetic field of 3T: 6.9 GHz, 0.9 GW; 7.3 GHz, 1.1 GW; and 10.0 GHz, 1 GW. The specific permittivities of the corresponding SWSs are 15.7, 34.3, and 42.0, respectively. V C 2015 AIP Publishing LLC. [http://dx.

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“…As an example of experimental research on BWOs, investigators at UNM studied the importance of end reflections on short-pulse BWO operation [47], and demonstrated BWO operation in the "cross-excitation regime" during longpulse operation [48]. The latter research was performed using the setup described in Fig.…”

Section: B Cherenkov Sourcesmentioning

confidence: 99%

Pulsed power-driven high-power microwave sources

et al. 2004

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The advent of pulsed power technology in the 1960s has enabled the development of very high peak power sources of electromagnetic radiation in the microwave and millimeter wave bands of the electromagnetic spectrum. Such sources have applications in plasma physics, particle acceleration techniques, fusion energy research, high-power radars, and communications, to name just a few. This article describes recent ongoing activity in this field in both Russia and the United States. The overview of research in Russia focuses on high-power microwave (HPM) sources that are powered using SINUS accelerators, which were developed at the Institute of High Current Electronics. The overview of research in the United States focuses more broadly on recent accomplishments of a multidisciplinary university research initiative on HPM sources, which also involved close interactions with Department of Defense laboratories and industry. HPM sources described in this article have generated peak powers exceeding several gigawatts in pulse durations typically on the order of 100 ns in frequencies ranging from about 1 GHz to many tens of gigahertz.Keywords-High-power microwave (HPM), intense electron beams, pulsed power.

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Enhanced frequency agility of high-power relativistic backward wave oscillators

Cited by 61 publications

References 5 publications

Overmoded GW-class surface-wave microwave oscillator

Overmoded GW-class surface-wave microwave oscillator

A tunable relativistic backward wave oscillator based on changing concentration of the filling dielectric

Pulsed power-driven high-power microwave sources

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