W-band gyro-devices using helically corrugated waveguide and cusp gun: design, simulation and experiment
W-band gyro-devices using helically corrugated waveguide and cusp gun: design, simulation and experiment
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DOI：
10.11906/tst.009-019.2011.03.02
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Wenlong He;C. Donaldson;F. Li;Liang Zhang;A. Cross;A. Phelps;K. Ronald;C. Robertson;C. Whyte;A. Young
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文献类型：
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作者：
Wenlong He;C. Donaldson;F. Li;Liang Zhang;A. Cross;A. Phelps;K. Ronald;C. Robertson;C. Whyte;A. Young
本文介绍了W波段回旋器件的设计和模拟，该器件采用螺旋波纹波导作为注波互作用区，尖点电子枪作为电子束源。通过数值模拟优化了电子束系统和注波互作用，并利用粒子模拟程序MAGIC预测（计算）了输出功率和频率带宽。使用闪烁体板的束流截面测量证实，在电流1.5 A和能量40 keV的设计束流参数下实现了轴环绕电子束。制作了回旋返波管（Gyro-BWO）的W波段螺旋波纹互作用区，用矢量网络分析仪测量了80 ~ 110 GHz的色散，结果与模拟和理论吻合较好。回旋返波管通过调节互作用腔中的磁场实现了频率可调工作。使用尖点枪的电子束模拟了~84-104 GHz的-3dB带宽和~10 kW的输出功率。回旋行波管放大器（Gyro-TWA）的-3dB带宽为90-100 GHz，输出功率为10 kW，饱和放大增益为40 dB。
This paper presents the design and simulation of W-band Gyro-devices using helically corrugated waveguides as the beam-wave interaction region and a cusp gun as the electron beam source. The electron beam system and the beam-wave interaction were optimized through numerical simulations by using a particle-in-cell (PIC) code MAGIC to predict (calculate) the output power and frequency bandwidth. The beam cross sectional measurement using a scintillator plate confirmed that an axis encircling electron beam was achieved with the designed beam parameters of current 1.5 A and energy 40 keV. The W-band helically corrugated interaction region for the gyrotron backward wave oscillator (Gyro-BWO) was manufactured with a dispersion from 80 GHz to 110 GHz measured using a vector network analyser which was found to be in good agreement with simulations and theory. The Gyro-BWO achieved frequency-tuneable operation by adjusting the magnetic field in the interaction cavity. A -3 dB bandwidth of ~84-104 GHz and output power ~10 kW were simulated using the electron beam from the cusp gun. The gyrotron travelling wave amplifier (Gyro-TWA) is designed to have a -3 dB frequency bandwidth of 90-100 GHz, output power of 10 kW and saturated amplification gain of 40 dB.