Experimental Study of a $Ku$ -Band RBWO Packaged With Permanent Magnet

Li, Xiaoze; Song, Wei; Tan, Weibing; Hu, Xianggang; Su, Jiancang; Xiaoxin, Zhu; Zhang, Ligang; Teng, Yan; Li, Lankai; Zhao, Haitao; Zhang, Xiangjun

doi:10.1109/ted.2019.2936835

Cited by 35 publications

(8 citation statements)

References 10 publications

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“…As a well-known, efficient, and widely used device, the typical RBWOs with low magnetic field are compared with the CTTO here. Reference [5], reference [6] and this paper present different methods to suppress the radial divergence of the electron beam and increase the power efficiency under low magnetic field in PIC simulation. In reference [5], the efficiency is 30% ∼ 45% at 9.9 GHz when the external magnetic field is between 0.6 T and 0.76 T. Its power saturation time is about 22 ns.…”

Section: Disccusionmentioning

confidence: 99%

“…However, the large electron beam energy spread due to the radial divergency of the electron beam under low magnetic fields will reduce the efficiency in these HPM sources. It is well known that the relativistic backward wave oscillator (RBWO) is HPM source with high efficiency, which can work at a low magnetic field [5,6]. One feasible method is to enlarge the overmoded ratio with multi-mode operation that is used to avoid mode competition and increase the efficiency of the overmoded HPM devices in reference [5].…”

Section: Introductionmentioning

confidence: 99%

“…One feasible method is to enlarge the overmoded ratio with multi-mode operation that is used to avoid mode competition and increase the efficiency of the overmoded HPM devices in reference [5]. Another method in reference [6] is to reduce the diode voltage and the cyclotron resonance magnetic flux density which is over the working guiding magnetic flux density. And the whole structure of the RBWO in a single mode is adequately optimized at the low magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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A high-efficiency C-band coaxial transit time oscillator with a dual-cavity extractor under low-magnetic fields

et al. 2023

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A high-efficiency C-band coaxial transit time oscillator with a dual-cavity extractor under low-magnetic fields is designed and studied through small-signal theory and particle-in-cell simulation. Small-signal theory analysis indicates that a dual-cavity extractor is superior to a single-cavity extractor in terms of the beam-coupling coefficient, the resonant frequency, and the external quality factor, which are good for high efficiency. Typical simulation results of the proposed device show that an output power of 1.73 GW and a frequency of 6.37 GHz can be obtained with a diode voltage of 455 kV and current of 9.75 kA. The corresponding power efficiency reaches 39 %, and the guiding magnetic field is 0.8 T. Further simulation demonstrates that the power efficiency exceeds 34 % in a rather large range of diode voltage from 385 kV to 470 kV and can reach higher than 35 % with a low guiding magnetic field of 0.4 T. Then this coaxial transit time oscillator is compared with the typical relativistic backward wave oscillators from the magnetic field, efficiency and power saturation time.

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Section: Disccusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A high-efficiency C-band coaxial transit time oscillator with a dual-cavity extractor under low-magnetic fields

et al. 2023

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“…However, these attempts and efforts were carried out mainly in RBWOs where IREBs are constrained with strong magnetic field. For a conventional RBWO operating at a magnetic-field strength below that of the cyclotron resonance, the beam-wave conversion efficiency obtained is generally lower than 30% [13][14][15][16][17][18]. In order to further promote the conversion efficiency, we propose a novel HPM generator based on KL-RBWO.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Enhancement of a Klystron-Like Relativistic Backward Wave Oscillator With Waveguide Reflection and Bunching Promotion

Wang

Xiao²,

Shi³

et al. 2020

IEEE Access

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A klystron-like relativistic backward-wave oscillator (KL-RBWO) with transverse electron beam confinement and waveguide reflection, which works well under a magnetic-field strength below that of the cyclotron resonance, is proposed. For this device operating with a low magnetic field, effective suppression of the transverse velocity of electron beams is introduced by a local electric field near the tube head, to promote modulation uniformity of electron beams. Part of the reflected microwave from the output waveguide provides feedback enhancement to the extractor, which strengthens the local standing-wave field. Owing to a stronger electric field that can interact with the electron beam in the extractor and a higher growth of fundamental harmonic current, the efficiency of the KL-RBWO is increased to 40% when guided by a magnetic field of 0.32 T, compared with that of 30% using conventional structures.INDEX TERMS High power microwaves, intense relativistic electron beams, relativistic backward-wave oscillator, Cherenkov radiation

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“…Worse more, the enlarged size of the device leads to an immense increase of the system's weight, especially the mass of the magnet. A too large device is impossible to be built compact and light as the permanent magnet's mass is strongly related with its transverse section size [22], [23]. Therefore, it is rather crucial to select a proper size for an overmoded SWS.…”

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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Experimental Study of a $Ku$ -Band RBWO Packaged With Permanent Magnet

Cited by 35 publications

References 10 publications

A high-efficiency C-band coaxial transit time oscillator with a dual-cavity extractor under low-magnetic fields

A high-efficiency C-band coaxial transit time oscillator with a dual-cavity extractor under low-magnetic fields

Efficiency Enhancement of a Klystron-Like Relativistic Backward Wave Oscillator With Waveguide Reflection and Bunching Promotion

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

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