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Experimental investigations on density bunching and its power influence in a relativistic backward-wave oscillator with low-magnetic-field operation
Physics of Plasmas ( IF 2.2 ) Pub Date : 2020-06-01 , DOI: 10.1063/5.0011898
Huida Wang 1, 2 , Renzhen Xiao 3 , Changhua Chen 3 , Yanchao Shi 3
Affiliation  

In a relativistic backward-wave oscillator operating at a low magnetic field, forward intense relativistic electron beams propagate with large transverse velocities and form a non-uniform beam-density distribution. This paper first investigates periodical density bunching by bombarding targets with electron beams in a relativistic drift tube. Then, the dependence of the density-bunching phase on interaction efficiency is studied experimentally for the first time with a C-band relativistic backward-wave oscillator. The results show a reduction in microwave power of over 40%, arising from a mismatch between the density-bunching phase and the standing-wave field in the resonant reflector, which is in reasonable agreement with particle-in-cell simulation results.

中文翻译:

低磁场相对论性后向波振荡器中密度聚束及其功率影响的实验研究

在低磁场下工作的相对论性后向波振荡器中,前向强相对论性电子束以较大的横向速度传播并形成不均匀的束密度分布。本文首先通过在相对论漂移管中用电子束轰击目标来研究周期性密度聚束。然后,首次使用 C 波段相对论后向波振荡器实验研究了密度聚束相位对相互作用效率的依赖性。结果表明,由于谐振反射器中密度聚集相位与驻波场之间的不匹配,微波功率降低了 40% 以上,这与细胞内粒子模拟结果非常吻合。
更新日期:2020-06-01
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