X波段短脉冲相对论返波管设计与初步实验
Design and preliminary experimental study of X-band short pulse relativistic backward wave oscillator
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摘要: 对基于短电子束脉冲超辐射机理的X波段相对论返波管进行了优化设计和粒子模拟，结果表明：在超辐射机理作用下，该器件能实现高峰值功率和高功率转换效率的微波辐射。在小型Tesla脉冲源基础上设计了阻抗变换段、二极管、磁场系统等装置，建立了一套小型窄脉冲电子加速器，以此为实验平台在低磁场条件下进行了器件的初步实验研究。在磁场0.73 T、束压约380 kV、束流约4.5 kA、脉宽3.1 ns条件下，实验获得的微波脉冲峰值功率约360 MW，脉宽1.10 ns，上升沿800 ps，频率9.15 GHz，功率转换效率为21%。Abstract: An optimized X-band relativistic backward wave oscillator (RBWO) based on superradiance mechanism of short electron beam was designed and simulated numerically. The simulation results indicate that the RBWO can realize microwave radiation with high peak power and high power conversion efficiency under superradiace mechanism. A small narrow pulse electron accelerator is build based on a compact Tesla pulse source along with design of a resistance conversion section, a diode and a magnetic system. The preliminary experiment was performed at low magnetic field condition. For guiding magnetic field 0.73 T, beam voltage 380 kV, beam current 4.5 kA and pulse width 3.1 ns, microwave pulses with about 360 MW peak power, 1.10 ns pulse width and 800 ps risetime were generated, and the conversion eff
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