0.14 THz过模表面波振荡器初步实验研究

为获得大功率太赫兹源，对基于表面波振荡器的相对论太赫兹源进行了初步的实验研究。为便于机械加工和实验装配，器件采用过模矩形波导慢波结构。利用理论分析和数值模拟得到的参数，在CKP1000加速器上进行了实验。功率测量采用辐射场功率密度积分方法，频率测量采用截止波导滤波法。在电子束压为320 kV、电子束流强度为2.1 kA、引导磁场为5 T条件下，实验获得频率0.136 THz以上、脉冲宽度为1.5 ns和辐射功率约2 MW的太赫兹信号输出。

Preliminary experimental research on overmoded surface wave oscillator with 0.14 THz

Preliminary experimental research on a relativistic terahertz source with 0.14 THz based on the surface wave oscillator was carried out. The device adopts an overmoded rectangular slow wave structure for the sake of large power capacity and easy fabrication. The experiment was performed on the CKP1000 generator according to theoretical analysis and numerical simulation results. Power measurement uses the radiation power density integral method and frequency measurement employs the cut off waveguide method. A terahertz wave with a frequency more than 0.136 THz, a pulse duration of 1.5 ns and output power more than 2 MW is obtained, under the condition of the electron beam voltage of 320 kV, the beam current of 2.1 kA, and the guiding magnetic field of 5 T.