频率高速调制的高次谐波太赫兹回旋管研究

Research on High Harmonic THz Gyrotron with High-speed Frequency Modulation

针对大功率太赫兹辐射源在增强核磁共振波谱技术等相关领域的应用,完成了基于改进型多段式回旋谐振腔结构的395 GHz太赫兹回旋管优化设计。为降低系统对磁场的需求,回旋管采用二次谐波工作方式。当回旋管处于工作电压12 kV,工作电流0.5 A,工作磁场7.2 T时,在395.1 GHz实现了1 kW的大功率太赫兹波输出。通过改变工作磁场和工作电压,实现了太赫兹回旋管的频率调谐。当工作电压为12 kV,工作磁场在7.19~7.21 T之间变化时,工作频率在395.09~395.2 GHz,频率调谐范围为110 MHz,输出功率在20 W~1 kW变化;当工作磁场为7.2 T,工作电压在10~12.6 kV之间变化时,工作频率在395.09~395.21 GHz,频率调谐范围为120 MHz,输出功率在15 W~1 kW范围内变化。

Based on an improved multi-section cavity,a 395GHz terahertz gyrotron is optimal designed.The gyrotron is used as high-power terahertz radiation source in dynamic nuclear polarization and other related fields.To reduce the requirement of magnetic field,the gyrotron operates in the second harmonic mode.At an operating voltage of 12kV,a current of 0.5A,and a magnetic field of 7.2T,a high-power THz output of 1kW is achieved at 395.1 GHz.By changing the operating magnetic field and the operating voltage,the frequency tuning of the gyrotron is achieved.When the operating voltage remains at 12kV and the operating magnetic field varies from 7.19T to 7.21T,the operating frequency changes from 395.09GHz to 395.2GHz,the frequency tuning range is 110MHz,and the output power varies from 20W to 1kW.When the operating magnetic field remains at 7.2T and the operating voltage varies from 10kV to 12.6kV,the operating frequency changes from 395.09GHz to 395.2GHz,the frequency tuning range is 120MHz,and the output varies from 15W to 1kW.