The Study of Q-band Sheet Beam Backward Wave Oscillator Based on a Planar U-shaned Slot-line Slow-wave Structure

2018 ◽  
Author(s):  
Ruichao Yang ◽  
Chong Ding ◽  
Gangxiong Wu ◽  
Lingua Yue ◽  
Jin Xu ◽  
...  
Keyword(s):  
Slow Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Backward Wave Oscillator ◽  
Slot Line ◽  
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.

scholarly journals Simulation Investigations of High Power Overmoded Relativistic Backward Wave Oscillator with Trapezoidal Resonant Reflector

2021 ◽  
Vol 71 (03) ◽  
pp. 346-350
Author(s):  
V. Venkata Reddy ◽  
M.A. Ansari ◽  
M. Thottappan
Keyword(s):  
Output Power ◽  
Slow Wave ◽  
High Power ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Backward Wave Oscillator ◽  
Particle In Cell ◽  
Resonant Reflector ◽  
Wave Oscillator ◽  
Backward Wave

An S-band high power relativistic backward wave oscillator using a trapezoidal resonant reflector and overmoded slow-wave structure is demonstrated by finite difference time domain based Particle-In-Cell code. The trapezoidal resonant reflector and slow-wave structure are chosen to improve the RBWO power handing capability to gigawatt (GW). The Trapezoidal resonant reflector enhances the pre-modulation during electron beam propagation, thus increasing the generated RF signal overall efficiency and coherency. The particle-in-cell simulation generated an RF output power ~5.4 GW in TM01 mode at ~3.6 GHz in a 2.0 T magnetic field and developed a 13.5 kA current for a 1.2 MV DC cathode voltage. The power conversion efficiency is achieved as ~33 %. Further, the influence of different design parameters on frequency, RF output power, and efficiency are analysed through Particle-In-Cell simulations.

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