多注速调管的3维数值计算

Three-dimensional analysis of multiple beam klystron

用KARAT-3D全电磁PIC程序,对多注速调管设计模型波束相互作用的物理过程进行3维数值模拟,给出了输出功率、电流等基本的物理参数。在输入电压14 kV,电流20.8 A时候,得到了128 kW的峰值输出功率,峰值效率是43.8%。考察了电子在高频场的运动和电流调制,分析了电流在各互作用腔中的调制,并对多注速调管不同发射度时电子传输进行了研究。结果表明:电子均匀发射时高频场的调制对电流传输效率影响不大,电流和电场调制随着腔的增加而增加。电子能量在输出腔的位置减小很多,电子有一部分能量转化为微波。

The three-dimensional analysis PIC code KARAT-3D was used to assess the multiple beam klystron（MBK）. A power output of about 128 kW was obtained at 1.25 GHz when input voltage was 14 kV and input current was 20, 8 A. Specially, the beam transimission coefficient and the current modulated coefficient were calculated. It was concluded that the current modulated coefficients were increased by the cavity number and that the energy of the electron decreased very fast when the electron passed the output cavity because some of the electron energy was transformed to microwave energy.