An S-band high-power tunable attenuator (HPTA) is proposed to adjust the output power of a 2.5 MW magnetron to the range of 40–2400 kW, which is equal to 0.17–17.78 dB attenuation. Additionally, the attenuation control accuracy is better than 0.9 dB/mm. The output power of the magnetron tube is changed by its current, which leads to the output frequency. Thus, the magnetron tube is not suitable for applications that require RF signals with a constant frequency and variable power. By using the proposed HPTA, which is connected to the output port of the magnetron, a signal with a constant frequency and variable power can be produced. In this new setup, the magnetron current is set to a maximum value, and then, the desired output power is realized by adjusting the attenuation of HPTA. This idea prevents the magnetron variation frequency while changing the output power. It should be noted that this system is low cost and lightweight when compared with other technologies, such as Klystron and traveling wave tubes (TWT) for RF conditioning of the linear accelerator.

中文翻译：

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用于直线加速器射频调节的带有磁控管的新型 S 波段高功率可调谐衰减器


提出了一种S波段高功率可调谐衰减器（HPTA），可将2.5 MW磁控管的输出功率调整到40-2400 kW范围，相当于0.17-17.78 dB衰减。此外，衰减控制精度优于0.9 dB/mm。磁控管的输出功率随其电流的变化而变化，从而导致输出频率。因此，磁控管不适合需要恒定频率和可变功率的射频信号的应用。通过使用连接到磁控管输出端口的所提出的 HPTA，可以产生具有恒定频率和可变功率的信号。在这种新设置中，磁控管电流设置为最大值，然后通过调整 HPTA 的衰减来实现所需的输出功率。这个想法可以防止磁控管在改变输出功率的同时改变频率。值得注意的是，与其他技术相比，例如用于直线加速器射频调节的速调管和行波管 (TWT)，该系统成本低且重量轻。