P波段混合型MILO的粒子模拟
Particle simulation of P-band hybrid MILO
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摘要: 结合负载限制型磁绝缘线振荡器(MILO)和渐变型MILO的特点提出并设计了P波段混合型MILO的结构，主要以负载限制型MILO结构作为雏形，将其内部仅含有的1根提取叶片用3根长度渐变的慢波叶片组成的渐变段替换。该结构可更好地实现束波相互作用，并使提取间隙电场与MILO输出同轴结构处的电场达到更好的匹配，增加微波输出功率。器件纵向总长度为47 cm，外筒直径为44 cm。优化后的2.5维全电磁粒子模拟结果表明：在二极管工作电压550 keV、电流约57 kA的情况下，输出微波的中心频率为640 MHz，平均功率为4.27 GW，束波转换效率为13.6％，器件4 ns时起振，6 ns达到饱和，且微波输出功率十分稳定，最终输出微波模式为TEM模。Abstract: With the 2.5D fully electromagnetic particle-in-cell code, a P-band hybrid magnetically insulated transmission line oscillator(MILO) was proposed and investigated by using the advantages of both tapered MILO and load-limited MILO. For the hybrid MILO, one extractor vane is taken place by three ones with tapered depth to form a taper section in the load-limited MILO. This provides a better match between the electric field of the main slow wave structure and the electric field of the output coaxial transmission line in order to increase the output microwave power. The simulation results show that a 640 MHz, 4.27 GW high power microwave in TEM mode can be obtained when the beam energy is 550 keV and current is about 57 kA. The efficiency is about 13.6%. The MILO starts to oscillate at 4 ns, a
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