Optimization of relativistic backward wave oscillator with non-uniform slow wave structure and a resonant reflector

Journal Article · Thu Jan 15 04:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4906896· OSTI ID:22408038

Chen, Zaigao; Wang, Jianguo ^[1]; Wang, Yue ^[2]

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1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049 (China)
2. Northwest Institute of Nuclear Technology, P.O. Box 69-12, Xi'an 710024 (China)

This letter optimizes synchronously 18 parameters of a relativistic backward wave oscillator with non-uniform slow wave structure (SWS) and a resonant reflector by using the parallel genetic algorithms and particle-in-cell simulation. The optimization results show that the generation efficiency of microwave from the electron beam has increased 32% compared to that of the original device. After optimization, the electromagnetic mode propagating in the resonant changes from the original TM{sub 020} mode of reflector to higher-order TM{sub 021} mode, which has a high reflection coefficient in a broader frequency range than that of the former. The modulation of current inside the optimized device is much deeper than that in the original one. The product of the electric field and current is defined. Observing this product, it is found that the interaction of the electron beam with the electromagnetic wave in the optimized device is much stronger than that in the original device, and at the rear part of SWS of the optimized device, the electron beam dominantly gives out the energy to the electromagnetic wave, leading to the higher generation efficiency of microwave than that of the original device.

• OSTI ID: 22408038
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALGORITHMS
COMPUTERIZED SIMULATION
CURRENTS
ELECTRIC FIELDS
ELECTRON BEAMS
FREQUENCY RANGE
INTERACTIONS
MICROWAVE RADIATION
MODULATION
OPTIMIZATION
OSCILLATORS
REFLECTION
RELATIVISTIC RANGE