A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

Tang, Yongfu; Meng, Lin; Li, Hailong; Liang, Zheng; Yin, Y.; Wang, Bin

doi:10.1088/0031-8949/85/05/055801

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…Unlike the results in a previous paper analyzing X-band dual frequencies (Tang et al, 2012), in this paper, perhaps because of the enhanced space harmonic and the reduction of the beam energy scatter in SWS2, both the dual frequencies demonstrate periodic-like dependence on l d , as presented in Figure 11, and this is the first time that observe dual-frequency agility in dual-band High-efficiency dual-band CRBWO oscillator. And it is interesting to find that when the C-band signal locates near the crest, the X-band component falls into its valley, and vice versa.…”

Section: Pic Simulation Resultscontrasting

confidence: 67%

“…(2) with SWS2 parameters are depicted in Figure 4, and the similar approximation of the beam velocity at the entrance of SWS2 is made (Huang et al, 2005;Tang et al, 2012). Unstable beam-wave interaction occurs near the interaction of SBSCW and quasi-TEM mode with 0.91 cm −1 ≤ k 0 ≤ 2.78 cm −1 , and further occurs near the interaction of SBSCW and the 1st space harmonic of the TM 01 mode with 3.08 cm −1 ≤ k 0 ≤3.17 cm −1 and near the interaction of SBSCW and the 1st space harmonic of the TM 02 mode with 3.74 cm −1 ≤ k 0 ≤ 3.97 cm −1 .…”

Section: Solutions To the Dispersion Relationmentioning

confidence: 72%

“…K 0 = 2π/l 0 is the corrugation wave-number, l 0 is the length of corrugation period, h is the ripple amplitude. The derivation of the dispersion relation for coaxial SWS with both inner and outer ripples has been given in a previous paper (Tang et al, 2012). Taking the amplitude of the inner ripple to be zero, we can obtain the following dispersion equation: …”

Section: Synchronous Beam-wave Interaction Analysis Linear Wave Dispementioning

confidence: 99%

“…Significant progress had been achieved in pursuing high power, high efficiency, high-power microwave (HPM) devices (Chen et al, 2002;Eltchaninov et al, 2003;Li et al, 2010;Xiao et al, 2010;Zhang et al, 2010), and the study of HPM relativistic Cherenkov oscillators with the capability of generating dual and multiple microwave frequencies simultaneously in one beam shot is becoming a novel and attractive topic recently (Chen et al, 2009;Ginzburg et al, 2003a;2003b;He et al, 2011;Ju et al, 2009;Ryskin et al, 2001;Tang et al, 2012;Wang et al, 2010;Yang et al, 1999), for the radiation beating radio-frequency waves could be used for electronic warfare systems, and various communication and sounding systems. Chen et al (2009) investigated the dual-frequency magnetically insulated transmission line oscillator (MILO) with azimuthal partition operating at L-band, the particle-in-cell (PIC) simulation results indicated that the power conversion efficiency was only about 8.1%.…”

Section: Introductionmentioning

confidence: 99%

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Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Tang

Meng

et al. 2012

Laser Part. Beams

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A dual-band high-efficiency coaxial relativistic backward wave oscillator (CRBWO) with asymmetric resonant reflector is designed and presented in this paper. Improved sectioned coaxial slow wave structure (SWS) with stepwise variation of coupling impedance and phase velocity is employed, and the performance of the dual-band CRBWO is investigated by use of a 2.5-D particle-in-cell (PIC) simulation code. When the diode voltage is 510 kV and beam current is 9.03 kA, an average microwave power of 1.0 GW with power conversion efficiency of 21.7% is obtained. Synchronously radiating dual-band frequencies of 8.1 GHz and 9.9 GHz are obtained, corresponding to C-band and X-band, respectively. A more clear and stable beating radiation microwave power with beating frequency of 1.8 GHz is acquired.

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Section: Pic Simulation Resultscontrasting

confidence: 67%

Section: Solutions To the Dispersion Relationmentioning

confidence: 72%

Section: Synchronous Beam-wave Interaction Analysis Linear Wave Dispementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Tang

Meng

et al. 2012

Laser Part. Beams

Self Cite

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show abstract

“…In order to allow efficient use of parallel architectures, it provides automated partitioning and dynamic load balancing. Based on the CHIPIC code, various realworld HPM experimental devices have been successfully simulated (Geng et al 2010;Liu 2010, 2011;Qin et al 2011;Tang et al 2012). The designers and researchers who want to largely shorten their design time can benefit a lot from using the CHIPIC code.…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulations of high-power microwave devices using the CHIPIC code

Zhou¹,

Liu²,

Liao³

2012

J. Plasma Phys.

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The CHIPIC code, a fully electromagnetic particle-in-cell (PIC) code for modeling and simulations of high-power microwave (HPM) devices, is introduced in this paper. It consists of a two-dimensional (2D) code and a three-dimensional (3D) code. The 2D code can model and simulate HPM devices with symmetric structure on 2D Cartesian, cylindrical and polar grids, while the 3D code can model and simulate HPM devices on 3D Cartesian and cylindrical grids. The fields are calculated using the finite-difference time-domain scheme, and the particles are described by the PIC scheme. Various types of boundary conditions have also been implemented for different kinds of applications. In addition, the 3D code is specifically designed for high-performance modeling and computing. It uses the message passing interface and the open specifications for multiprocessing (OpenMP) for parallelization. Its parallel design ensures that it is capable of efficiently executing on a variety of architectures. In order to allow efficient use of parallel architectures, it provides automated partitioning and dynamic load balancing. Even though this code is still in development, it has successfully simulated various real-world HPM experimental devices. Simulation results on some typical HPM devices by using the CHIPIC code are given, which agree well with those obtained from some well-known PIC codes. Direction for future work is also presented.

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A three-band frequency hopping high power microwave oscillator based on magnetic field tuning

Hu,

Zhang,

et al. 2023

Physics of Plasmas

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The frequency hopping technology is one of the most significant research directions for high-power microwave (HPM) devices. This paper presented a novel HPM oscillator with frequency hopping across C, X, and Ku bands based on magnetic field tuning. A coaxial transit time oscillator (TTO) is nested onto the outer conductor of the hollow relativistic Cherenkov microwave oscillator, which forms a dual electromagnetic structure with a single-annular cathode. When the electron beam is guided by gradient magnetic fields, it interacts with TTO to produce Ku-band HPMs. If the gradient magnetic field changes into the uniform magnetic field, the electron beam would enter the relativistic Cherenkov microwave oscillator, and the frequency of generated microwaves decreases, which are decided by the strength of the magnetic fields according to the cyclotron resonance absorption theory. In the particle-in-cell simulation, when the diode voltage and gradient magnetic field are 580 kV and 0.5 T, respectively, a Ku-band HPM output with a frequency of 13.9 GHz and a power of 2.09 GW is obtained, corresponding to power efficiency of 42%. When the magnetic field transforms into uniform, the device produces an X-band HPM output with a frequency of 9 GHz and a power of 2.4 GW at a diode voltage of 683 kV and a magnetic field of 0.7 T. When the voltage and magnetic field strength are increased to 699 kV and 1.5 T, respectively, the device generates a C-band HPM output with a frequency of 4.5 GHz and a power of 2.1 GW. The corresponding conversion efficiency of the X-band and C-band Cherenkov microwave oscillators is 35% and 30.7%, respectively.

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A dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector

Cited by 11 publications

References 27 publications

Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Modeling and simulations of high-power microwave devices using the CHIPIC code

A three-band frequency hopping high power microwave oscillator based on magnetic field tuning

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