We propose and experimentally demonstrate a high-power and wide-bandwidth terahertz travelling wave tube (TWT), which is with two cascade amplification sections: the output wave of the first TWT is used as the input of the second one. Using a 17 kV, 71 mA electron beam, the measured peak power is over 60 watt and the average output power is over 12 watts with 20% duty cycle at the frequency around 0.22 THz. The gain is about 30 dB and the bandwidth is over 6 GHz. The average power-bandwidth-gain product reaches record high in the designed spectral range. We envisage that this new developed terahertz TWT will have broad application prospects, such as in long-range radar and communication systems.

中文翻译：

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级联放大的大功率和宽带G波段行波管演示

我们提出并通过实验演示了一个高功率和宽带太赫兹行波管（TWT），它具有两个级联放大部分：第一个TWT的输出波用作第二个TWT的输入。使用17 kV，71 mA电子束，测得的峰值功率超过60瓦，平均输出功率超过12瓦，占空比为20％，频率约为0.22 THz。增益约为30 dB，带宽超过6 GHz。在设计的频谱范围内，平均功率带宽增益乘积达到创纪录的高位。我们设想，这种新开发的太赫兹TWT将具有广阔的应用前景，例如在远程雷达和通信系统中。