A novel self-injection relativistic backward wave oscillator

2021 ◽  
Author(s):  
Zhiqiang Fan ◽  
Jun Sun ◽  
Yibing Cao ◽  
Zhimin Song ◽  
Yanchao Shi ◽  
...  
Keyword(s):  
Electron Beam ◽  
Conversion Efficiency ◽  
Dominant Role ◽  
Wave Interaction ◽  
Operating Mode ◽  
Beam Current ◽  
Frequency Locking ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

Abstract A novel self-injection relativistic backward wave oscillator (RBWO) has been proposed. By introducing a self-injection path into the RBWO, a small portion of the energy in the reflector can be coupled to the upstream of the reflector, and then the formed electric field in the self-injection path region can pre-modulate the passing electron beam, to promote a frequency-locking oscillation of the electron beam. The pre-modulated electron beam can be expected to enhance the beam-wave interaction and suppress parasitic mode oscillation, which is beneficial for maintaining the dominant role of the operating mode. The proposed self-injection RBWO shows great potential for improving the conversion efficiency and pulse duration time. Through particle-in-cell simulation, a microwave with a power of 10.6 GW is obtained, when the beam voltage is 1.08 MeV, and the beam current is 18.6 kA. The conversion efficiency is 53%.

scholarly journals Релятивистская лампа обратной волны с продольно-щелевым дифракционным выходом

2022 ◽  
Vol 48 (3) ◽  
pp. 28
Author(s):  
В.В. Кладухин ◽  
С.П. Храмцов ◽  
В.Ю. Ялов
Keyword(s):  
Electron Beam ◽  
Experimental Studies ◽  
Operating Mode ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave ◽  
Slotted Waveguide ◽  
Relativistic Bwo

The results of experimental studies evaluating the influence of longitudinal slits in a conical diffraction outlet, combined with an electron collector, of a 10 GHz relativistic BWO (Backward-Wave Oscillator) with an operating mode TM01 are presented. It has been shown experimentally that replacing a solid conical waveguide with a similar longitudinal-slotted waveguide has little effect on the performance of the BWO. The use of a longitudinally slotted diffraction outlet instead of a continuous one makes it possible to reduce the volume of plasma and microparticles formed on the diffraction outlet surface under the action of an electron beam, and to improve their adsorption and removal.

Particle simulation of dual-band coaxial relativistic backward-wave oscillator with a single annular electron beam

2013 ◽  
Vol 25 (5) ◽  
pp. 1184-1188
Author(s):  
唐永福 Tang Yongfu ◽  
蒙林 Meng Lin ◽  
李海龙 Li Hailong ◽  
张斐娜 Zhang Feina
Keyword(s):  
Electron Beam ◽  
Particle Simulation ◽  
Dual Band ◽  
Backward Wave Oscillator ◽  
Annular Electron Beam ◽  
Wave Oscillator ◽  
Backward Wave

scholarly journals Design and efficient operation of a coaxial RBWO

2013 ◽  
Vol 31 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Y. Teng ◽  
C.H. Chen ◽  
H. Shao ◽  
J. Sun ◽  
Z.M. Song ◽  
...  
Keyword(s):  
Electron Beam ◽  
Slow Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Power Capacity ◽  
Efficient Operation ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave ◽  
Output Efficiency

AbstractCoaxial relativistic backward wave oscillator with the rippled inner conductor not only increases the output efficiency but also results in the serious phenomenon of pulse shortening in experiments. Our research indicates that the two main mechanisms leading to the pulse shortening are the electron beam interruption and combining effects of the explosive field electron emission and the secondary electron multipactor on the surface of the slow-wave structure. In order to enhance its power capacity the electrodynamic structure is modified by detailed analysis of the field distribution in the coaxial slow-wave structure. The appropriate resonant reflector and the electron collector are developed for the application of the coaxial relativistic backward wave oscillator. A series of surface treatment is applied to enhance the power capacity of the coaxial RBWO. In the experiment, the microwave pulse duration is increased from less than 10 ns to 20 ns, and the output efficiency is enhanced from less than 20% to 34% employing the electron beam pulse of the full width at half maximum 28 ns. The peak power of 1.01 GW at the frequency of 7.4 GHz is achieved. It is found that the output efficiency of the coaxial RBWO is likely to be advanced if its power capacity can be boosted further.

Multi-GW relativistic backward wave oscillator with TM02 operating mode

2015 ◽  
Author(s):  
V. V. Rostov ◽  
R. V. Tsygankov ◽  
A. V. Gunin ◽  
A. A. Elchaninov ◽  
J. C. Ju ◽  
...  
Keyword(s):  
Operating Mode ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

scholarly journals Generation of beating wave by multi-coaxial relativistic backward wave oscillator

2013 ◽  
Vol 31 (4) ◽  
pp. 703-714 ◽  
Author(s):  
Y. Teng ◽  
T.Z. Liang ◽  
J. Sun
Keyword(s):  
Conversion Efficiency ◽  
Microwave Pulse ◽  
Average Power ◽  
Magnet System ◽  
Backward Wave Oscillator ◽  
High Power Microwave ◽  
Wave Oscillator ◽  
Backward Wave ◽  
Frequency Components ◽  
Diode Voltage

AbstractMulti-coaxial relativistic backward wave oscillator that generates the beating wave of high power microwave pulse driven by a single accelerator and a single guiding magnet system is presented. Making use of the coaxial annular cathodes that can synchronously produce three annular beams at one shot, the average power of 5.88 GW consisting of two frequency components 9.0 and 9.7 GHz is obtained under the diode voltage and current 724 and 19.57 kA, corresponding to the conversion efficiency 41.5%. The conversion efficiency and the beating frequency are considerably stable with the diode voltage. The coaxial transmission supporter developed from our previous experimental research is employed to conductively connect the coaxial structure and to incoherently combine the microwave pulse of two frequencies with little reflection. It is found that the equipotential connection of the coaxial structure modifies the field distribution in the diode structure to facilitate the operation of the coaxial annular cathodes. The coaxial cathodes of different lengths are proved to be efficient at depressing the space charge effect in order to prevent the explosive emission of the inner cathode from being shielded by the outer annular beams.

scholarly journals Effects of transverse electron beam motion in a relativistic backward wave oscillator operating at low guiding magnetic field

AIP Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 025321 ◽  
Author(s):  
Huida Wang ◽  
Renzhen Xiao ◽  
Changhua Chen ◽  
Ping Wu ◽  
Yanchao Shi
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave ◽  
Beam Motion ◽  
Transverse Electron
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