Wang Jianguo, Wang Guangqiang, Wang Dongyang, Li Shuang, Zeng Peng
Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, P. O. Box 69-1, Xi'an, 710024, China.
Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, China.
Sci Rep. 2018 May 3;8(1):6978. doi: 10.1038/s41598-018-25466-w.
High power vacuum electronic devices of millimeter wave to terahertz regime are attracting extensive interests due to their potential applications in science and technologies. In this paper, the design and experimental results of a powerful compact oversized surface wave oscillator (SWO) in Y-band are presented. The cylindrical slow wave structure (SWS) with rectangular corrugations and large diameter about 6.8 times the radiation wavelength is proposed to support the surface wave interacting with annular relativistic electron beam. By choosing appropriate beam parameters, the beam-wave interaction takes place near the π-point of TM mode dispersion curve, giving high coupling impedance and temporal growth rate compared with higher TM modes. The fundamental mode operation of the device is verified by the particle-in-cell (PIC) simulation results, which also indicate its capability of tens of megawatts power output in the Y-band. Finally, a compact experimental setup is completed to validate our design. Measurement results show that a terahertz pulse with frequency in the range of 0.319-0.349 THz, duration of about 2 ns and radiation power of about 2.1 MW has been generated.
毫米波至太赫兹波段的高功率真空电子器件因其在科学技术中的潜在应用而备受广泛关注。本文介绍了一种Y波段高功率紧凑型过尺寸表面波振荡器（SWO）的设计及实验结果。提出了一种具有矩形波纹且大直径约为辐射波长6.8倍的圆柱形慢波结构（SWS），以支持表面波与环形相对论电子束相互作用。通过选择合适的束流参数，束波相互作用发生在TM模色散曲线的π点附近，与更高阶的TM模相比，具有较高的耦合阻抗和时间增长率。粒子模拟（PIC）结果验证了该器件的基模运行，结果还表明其在Y波段具有数十兆瓦的功率输出能力。最后，完成了一个紧凑型实验装置以验证我们的设计。测量结果表明，已产生频率范围为0.319 - 0.349太赫兹、持续时间约2纳秒且辐射功率约2.1兆瓦的太赫兹脉冲。
