Operation of a 140 GHz Gyro-amplifi er using a Dielectric-loaded, Sever-less Confocal Waveguide

The design and experimental results of a 140 GHz gyro-amplifi er that uses a dielectric-loaded, sever-less confocal waveguide are presented. The gyro-traveling wave amplifi er uses the HE06 mode of a confocal geometry with power coupled in and out of the structure with Vlasov-type, quasi-optical couplers. Dielectric loading attached to the side of the confocal structure suppresses unwanted modes allowing zero-drive stable operation at 48 kV and 3A of beam current. The confocal gyro-amplifi er demonstrated a peak circuit gain of 35 dB, a bandwidth of 1.2 GHz and a peak output power of 550 W at 140.0 GHz.

本文报道了一款采用介质加载无隔板共焦波导的140 GHz回旋放大器（gyro-amplifier）的设计方案与实验结果。该回旋行波放大器采用共焦结构的HE06模，并通过弗拉索夫型准光学耦合器（Vlasov-type quasi-optical couplers）实现该结构的功率输入与输出。附着于共焦结构侧面的介质加载结构可抑制杂模，使其能够在48 kV电压、3A束流的工况下实现零驱动稳定工作。这款共焦回旋放大器在140.0 GHz频段下展现出35 dB的峰值电路增益、1.2 GHz的工作带宽以及550 W的峰值输出功率。