Analysis, Design, and 3-D Simulation of a High-Efficiency Overmoded Nonuniform Relativistic Backward-Wave Oscillator

Ansari, M. A.; Thottappan, M.

doi:10.1109/ted.2018.2795099

Cited by 6 publications

References 23 publications

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Investigation of a cross-band relativistic Cherenkov oscillator based on the cathode adjustment

Zhang

Dang

et al. 2019

AIP Advances

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The mechanism and realization of a cross-band relativistic Cherenkov oscillator based on the cathode adjustment are presented. The device adopts coaxial dual-annular cathode to emit the inner and the outer electron beams, independently. When the inner annular cathode is extended and the outer annular cathode is retracted, the electron beams are emitted from the inner cathode and interact with the internal electromagnetic structure to generate Ka-band microwaves. On the contrary, the outer electron beams interact with the external electromagnetic structure to generate X-band microwaves. Thus, the cross-band microwave generation can be achieved only by adjusting the protrusion and retraction of dual-annular cathode. By the particle-in-cell (PIC) method, the physical process of beam-wave interaction in the device is studied, and the high efficiency internal-external double electromagnetic structures are designed. Simulation results show that the X-band microwave with a power of 1.50 GW and a frequency of 8.55 GHz is generated, corresponding to an efficiency of 32%. Meanwhile, the Ka-band microwave with power of 650 MW and frequency of 31.80 GHz is generated, corresponding to efficiency of 28%.

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Investigation of a cross-band relativistic Cherenkov oscillator based on the cathode adjustment

Zhang

Dang

et al. 2019

AIP Advances

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The impact of accelerating diode resonances on L-band high-power long-pulse relativistic backward wave oscillator operation

et al. 2023

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An L-band high-power relativistic backward wave oscillator is designed. In the simulation, microwaves centered at 1.6 GHz are generated, with the power of 3.6 GW and the efficiency of 40%. In the preliminary experiment, the pulse duration of the device was only 45 ns, presenting a pulse-shortening phenomenon. Through the 3D particle-in-cell simulation analysis, it was found that the accelerating diode resonances significantly impact the operation of the L-band high power relativistic backward wave oscillator, and the resonance of a TE11 mode in the accelerating diode played the primary role in the pulse shortening. Moreover, we found that choosing the appropriate distance between the cathode baffle and the end of the annular cathode is beneficial to effectively suppress the starting oscillation of the parasitic TE11 mode. In the improved experiment, we changed the distance between the cathode baffle and the end of the annular cathode from previous 5.4 to 4.6 cm. Eventually, when the diode voltage is 650 kV and the diode current is 14 kA, microwaves centered at 1.58 GHz are generated with the power of 3.3 GW, the efficiency of 36%, and the pulse duration above 104 ns.

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Study of Improved Cavity Resonant Reflector for an X-Band Relativistic Backward Wave Oscillator

Ansari

Thottappan

2018

2018 IEEE MTT-S International Microwave and RF Conference (IMaRC)

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Analysis, Design, and 3-D Simulation of a High-Efficiency Overmoded Nonuniform Relativistic Backward-Wave Oscillator

Cited by 6 publications

References 23 publications

Investigation of a cross-band relativistic Cherenkov oscillator based on the cathode adjustment

Investigation of a cross-band relativistic Cherenkov oscillator based on the cathode adjustment

The impact of accelerating diode resonances on L-band high-power long-pulse relativistic backward wave oscillator operation

Study of Improved Cavity Resonant Reflector for an X-Band Relativistic Backward Wave Oscillator

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