Technology development for a mm-wave sheet-beam traveling-wave tube
Technology development for a mm-wave sheet-beam traveling-wave tube
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DOI：
10.1109/tps.2004.841172
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发表时间：
2005-02-01
影响因子：
1.5
通讯作者：
Humphries, S
中科院分区：
文献类型：
--
作者：
Carlsten, BE;Russell, SJ;Humphries, S
片状波束行波放大器已被提出作为95-300 GHz射频的高功率发生器，采用微细制作的射频慢波结构(Carlsten，2002)。微加工技术的平面几何形状与平板光束的平面几何形状匹配得很好，允许的较大束流导致高峰值功率、高平均功率和较宽的带宽。使用叶片加载的波导作为慢波结构的标称设计的模拟结果表明，在120千伏、20-A的电子束作用下，在95 GHz处的增益超过1分贝/毫米，提取效率大于20%。我们已经确定稳定的薄片光束形成和传输是实现这种类型设备的关键技术。此外，由于慢波结构的高纵横比，射频耦合很复杂，需要多个输入和输出耦合器。射频模式必须在电子束的宽度上横向平坦，这对叶片设计和输入输出耦合都有影响。在本文中，我们报道了在慢波结构中稳定的片状光束传输和射频模式控制方面的新见解。
A sheet-beam traveling-wave amplifier has been proposed as a high-power generator of radio frequency (RF) from 95 to 300 GHz, using a microfabricated RF slow-wave structure (Carlsten, 2002). The planar geometry of microfabrication technologies matches well with the nearly planar geometry of a sheet beam, and the greater allowable beam current leads to high-peak power, high-average power, and wide bandwidths. Simulations of nominal designs using a vane-loaded waveguide as the slow-wave structure have indicated gains in excess of 1 dB/mm, with extraction efficiencies greater than 20% at 95 GHz with a 120-kV, 20-A electron beam. We have identified stable sheet beam formation and transport as the key enabling technology for this type of device. Also, due to the high aspect ratio in the slow-wave structure, the RF coupling is complicated and requires multiple input and output couplers. The RF mode must be transversely flat over the width of the electron beam, which impacts both the vane design and the input and output coupling. In this paper, we report on new insights on stable sheet-beam transport and RF mode control in the slow-wave structure.