大功率0.34THz辐射源中慢波结构的优化设计  

Optimization of slow-wave structure in high power 0.34THz radiation source

作　　者：李爽[1] 王建国[1,2] 童长江[1] 王光强[1] 陆希成[1] 王雪锋[1] 

机构地区：[1]西北核技术研究所,西安710024 [2]西安交通大学电子与信息工程学院,西安710049

出　　处：《物理学报》2013年第12期155-161,共7页Acta Physica Sinica

摘　　要：为研制大功率太赫兹源,提出以切连科夫表面波振荡器为基础,采用过模结构来研究0.34THz信号的产生.重点研究了慢波结构的各参数对器件输出性能的影响,对慢波结构进行了优化设计,并采用数值模拟方法,对慢波结构实际参数的选取和实验中所允许的加工精度提了具体要求;最后采用粒子模拟对该结构进行了"热腔"模拟计算.结果表明该结构能够产生频率为0.34THz,输出功率约为7.8MW的太赫兹信号,并且稳定工作于表面波振荡器状态.该结果为下一步0.34THz太赫兹源的研制奠定了基础.Based on surface-wave oscillator （SWO）, the high power 0.34 THz source using over-moded structure is studied. The attention is paid to the influence of the parameters of the slow-wave structure （SWS） on the dispersion curve, and then the SWS is optimized. According to the simulation results, the size of SWS and the requirements for the accuracy in the SWS machining are confirmed. Finally, the source is simulated by the particle-in-cell method. Numerical results show that the structure is capable of radiating a terahertz signal with a frequency of 0.34 THz and a maximum output powerof about 7.8 MW. Moreover, the structure works in the state of an SWO stably. The research of the SWS is the foundation of the design of 0.34 THz source, and it is also very meaningful for the realization of the source in engineering.

关 键 词：表面波振荡器 慢波结构 太赫兹 粒子模拟 

分 类 号：TL77[核科学技术—辐射防护及环境保护]