Ka-band relativistic diffraction generator with a tapered coaxial Bragg reflector

Ka-band relativistic diffraction generator with a tapered coaxial Bragg reflector
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带有锥形同轴布拉格反射器的 Ka 波段相对论衍射发生器

DOI:
10.1063/1.4998208
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发表时间:
2017-11
期刊:
影响因子:
1.6
通讯作者:
Zongjun Shi
Zongjun Shi
中科院分区:
材料科学4区
文献类型:
--
作者:
Feng Lan;Ziqiang Yang;Pinaki Mazumder;Zongjun Shi

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为了提高相对论衍射发生器(RDG)的微波输出功率,引入了一种内脊波纹周期性渐变的同轴线作为分布布拉格反射器。RDG装置由过模横截面、两段盘载圆柱形慢波结构(SWS)组成,同轴反射器放置在第一SWS段的上游。本文采用全三维粒子模拟和实验研究了具有锥形布拉格反射器的RDG器件。对反射器的结构参数进行了优化,使其具有良好的选模特性和频率响应特性。结果表明,在不同的磁场强度下,振荡模式不同。在29 ~ 31 GHz处测得TM 01模辐射功率超过300 MW,TM 11模辐射功率超过700 MW。结果表明,反射镜对器件的性能有很大的影响。在适当的条件下工作,辐射功率显著提高。
A coaxial line with periodically tapered inner rode corrugated ripples is introduced to act as a distributed Bragg reflector to increase output microwave power of relativistic diffraction generator (RDG). The RDG device consists of an overmoded cross-section, two-sectional disk-loaded cylindrical slow-wave structure (SWS), and coaxial reflector is placed upstream at the first SWS section. The RDG device with tapered Bragg reflector is investigated by full three-dimensional Particle-in-Cell (PIC) simulations and experiments in this paper. The structural parameters of the reflector are optimized for favorable characteristic of mode selection and frequency response. It is found that oscillation modes varied at different magnetic field magnitude. The measured radiation power at 29∼31 GHz is over 300 MW for TM01 mode and over 700 MW for TM11 mode. Results show that the reflector has a great impact on performance of the device. Operating at proper conditions, the radiation power is remarkably enhanced.
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