Релятивистская лампа обратной волны с продольно-щелевым дифракционным выходом

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.

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A novel self-injection relativistic backward wave oscillator

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac453b ◽

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%.

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Improved Performance of Oversized Backward Wave Oscillator Driven by Weakly Relativistic Electron Beam

Fusion Science & Technology ◽

10.13182/fst07-a1390 ◽

2007 ◽

Vol 51 (2T) ◽

pp. 325-327 ◽

Cited By ~ 11

Author(s):

S. Aoyama ◽

Y. Miyazawa ◽

K. Ogura ◽

A. Sugawara ◽

M. Hirata

Keyword(s):

Electron Beam ◽

Relativistic Electron ◽

Relativistic Electron Beam ◽

Backward Wave Oscillator ◽

Wave Oscillator ◽

Backward Wave ◽

Improved Performance

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

High Power Laser and Particle Beams ◽

10.3788/hplpb20132505.1184 ◽

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

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The buildup of oscillations in an electron beam backward-wave oscillator

IEEE Transactions on Electron Devices ◽

10.1109/t-ed.1965.15501 ◽

1965 ◽

Vol 12 (6) ◽

pp. 307-312 ◽

Cited By ~ 1

Author(s):

D.L. Bobroff

Keyword(s):

Electron Beam ◽

Backward Wave Oscillator ◽

Wave Oscillator ◽

Backward Wave

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Design and efficient operation of a coaxial RBWO

Laser and Particle Beams ◽

10.1017/s0263034612001061 ◽

2013 ◽

Vol 31 (2) ◽

pp. 321-331 ◽

Cited By ~ 10

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.

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