具有超辐射特性的回旋器件模拟研究
Simulation of cyclotron device with superradiance characteristic
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摘要: 在详细分析快波结构中的束波互作用基础上,采用2.5维PIC粒子模拟软件设计了一种回旋器件。该器件采用摇摆器形成回旋电子束,并采用强耦合方式和优化的互作用段长度，在束压250 kV、束流200 A、脉宽1 ns的电子束驱动下，模拟获得了峰值功率7 MW、频率38.5 GHz的微波短脉冲输出，峰值功率转换效率达到14%。其峰值输出功率与束脉宽之间的平方关系符合超辐射效应的特征。Abstract: A cyclotron was designed using the 2.5 dimensional particle simulation code KARAT in the paper. Transverse momentum of the electrons was imparted by a kicker. By using intense coupling and optimized length of the interaction space, the device could generate microwave pulse with a peak power of 7 MW, an operating frequency of 38.5 GHz with the diving electron beam of 250 kV, 200 A and 1 ns. The peak power conversion reached 14%. The peak power had a square relationship with the beam pulse width during certain range, which was in accordance with the character of superradiance.
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Key words:
- high power microwave /
- cyclotron /
- superradiance /
- particle simulation
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