中文摘要：

为了发展大功率、实用性强的太赫兹辐射源,文中对太赫兹回旋管中多个二次谐波工作模式的注波互作用进行了理论和实验研究,分析不同参数下多个二次谐波工作模式单模振荡的条件.实验研究结果表明,在二次谐波工作状态下,通过调节工作磁场、电流等参数,在单管中实现了四个不同频率0.391、0.404、0.416、0.423 THz,千瓦级以上输出功率的太赫兹波辐射.

英文摘要：

In order to develop compact, reliable and high power terahertz radiation sources, multi-mode second-harmonic operation in a terahertz gyrotron was investigated theoretically and experimentally. The theoretical calculation results show that there are five second-harmonic modes which operate at single-mode oscillation state in the gyrotron by adjus- ting the design parameters. Experimental results demonstrated that there are four second-harmonic modes （ TE16, TE64, TE46 and TE26 ） in the gyrotron operating with a 1.5A/41kV electron beam. Output powers of 1.5, 2.1, 3.0 and 1.4 kW can be generated at the corresponding frequencies of 0.391, 0. 404, 0. 416 and 0. 423 THz, respectively.