Dual band operation of the relativistic BWO

Rozental, R. M.; Sergeev, A. S.

doi:10.1109/ivec.2003.1286225

Cited by 13 publications

(9 citation statements)

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“…In recent years, more and more attention has been devoted to the study of high-power relativistic Cherenkov oscillators with the capability of generating dual frequencies [1][2][3][4][5][6][7], and research of this kind of high-power microwave sources has important practical significance, because such sources can be used in plasma heating (electron cyclotron resonance heating (ECRH)) for fusion plasma and various communication and sounding systems. Chen et al [4,5] investigated the dual-frequency magnetically insulated transmission line oscillator with azimuthal partition, and the particle-in-cell (PIC) simulation results indicated that the power conversion efficiency was low, only about 6.5%.…”

Section: Introductionmentioning

confidence: 99%

“…The RBWO, which is characterized by short transient time and good adaptation to variable electron beam parameters, offers a potential candidate for a dual-frequency generator. Ginzburg et al [1,3] theoretically demonstrated the possibility of generating dual frequencies in a non-coaxial RBWO with sectioned slow wave structures (SWSs), and the theoretical analysis and simulation results both indicated that different operation regimes, i.e. the stationary single-frequency regime, periodic automodulation regime and stochastic automodulation regime could be realized.…”

Section: Introductionmentioning

confidence: 99%

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

Tang¹,

Meng²,

Li³

et al. 2012

Phys. Scr.

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An X-band dual-frequency coaxial relativistic backward-wave oscillator with a modulating resonant reflector is presented and investigated in this paper. Through a theoretical study, numerical analysis and particle-in-cell (PIC) simulation, the stationary single-frequency regime is selected as the operation regime, and the high-frequency characteristics of the system, including the unstable beam–wave interaction regions and operation mode of each section, are obtained. The PIC simulation results indicate that an average power of 1.07 GW with a power conversion efficiency of 24.2% is obtained with an electron beam of 520 kV and 8.5 kA guided by an axial magnetic field of 2.4 T, and the two dominant frequencies are 9.43 and 10.30 GHz, respectively. Furthermore, a periodic-like change in the smaller dominant frequency with a frequency agility bandwidth of about 0.40 GHz is acquired.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Tang¹,

Meng²,

Li³

et al. 2012

Phys. Scr.

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“…In the two-section CRBWO with non-uniform SWSs, different operation regimes, i.e., single-frequency regime, periodic, and stochastic auto-modulation regimes, could be established in different sections by changing the interaction length of each section and the stepwise change of the mismatch between the space charge wave and synchronous eigenmode wave, i.e., the synchronous detuning (Ginzburg et al, 2003a;2003b). The shift in synchronous detuning is provided by a stepwise variation of the corrugation period length of the SWS, i.e., the phase velocity of the Eigen mode wave.…”

Section: Theory Principles Of Dual-band Operations In Section Swsmentioning

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%

“…He et al (2011) designed a dualfrequency high-power microwave generator based on transition radiation, but the large transverse dimension makes it incompact and unpractical. Ginzburg et al (2003a;2003b) designed a dual-frequency RBWO with two-section SWSs. The modeling results using code KARAT showed that dualfrequency of 8.8 GHz and 10.3 GHz with radiation power of 1 MW and power efficiency of 10% were obtained.…”

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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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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Dual band operation of the relativistic BWO

Cited by 13 publications

References 0 publications

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

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

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

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

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