L波段相对论返波振荡器初步实验研究
Primary experiments of L-band relativistic backward wave oscillator
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摘要: 设计了一个紧凑型L波段相对论返波振荡器 (RBWO),利用Karat 2.5维全电磁粒子模拟程序研究了器件内部束-波作用的物理过程。模拟结果表明:在二极管电压700 kV、电子束流10 kA、导引磁场为1.0 T时,能实现L波段2.23 GW高功率微波输出,平均效率约为31.8%。为验证模拟结果,在高阻加速器平台上进行了初步实验:当二极管电压为703 kV、电流10.6 kA、导引磁场为0.8 T时,实验获得了峰值功率1.05 GW、频率1.61 GHz、脉宽38 ns的高功率微波输出,其功率效率为14.4%。Abstract: A compact L-band relativistic backward wave oscillator(RBWO) is investigated with simulation and experimental method. In simulation, the L-band coaxial RBWO, driven by a 700 kV, 10 kA electron beam, comes to a nonlinear steady state in 20 ns. High-power microwave(HPM) is generated with an average power of 2.23 GW, a frequency of 1.60 GHz, and power conversion efficiency of 31.8%. In the primary experiment, the measured microwave frequency is 1.61 GHz, with a peak power level of above 1.05 GW, when the diode voltage is 703 kV and the current is 10.6 kA. The pulse duration (full-width at half-maximum) of the radiated microwave is 38 ns.
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