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首页> 外文期刊>Electron Devices, IEEE Transactions on >Development and Application of a Nonlinear Beam-Wave Interaction Code SBK2D for Sheet Beam Klystrons
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Development and Application of a Nonlinear Beam-Wave Interaction Code SBK2D for Sheet Beam Klystrons

机译：片状速调管非线性波-波相互作用码SBK2D的开发与应用

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摘要

To study the nonlinear beam-wave interaction for sheet beam klystron (SBK), a 2-D simulation code of SBK2D, based on the 2-D rod macroparticle model, has been designed and realized thoroughly in this paper. In our physical model, the sheet beam is simulated by a series of rods with nonzero thickness and length in (y) and (z) directions, respectively ( (y) is the direction of sheet beam’s narrow dimension, and (z) is the direction of beam motion). Then, the space-charge forces between the rod macroparticles are calculated by Green’s functions approach, and the port-approximation methods are employed to simulate high-frequency fields for each cavity. Furthermore, the relativistic Lorentz motion equation is solved to obtain the parameters for further macroparticle motion, and the specific criterions are introduced to deal with the sheet beam interception problem by the tunnel and cavities. To verify our simulation code, an eight-cavity W-band SBK has been designed, calculated, and analyzed by SBK2D in detail. The good consistency between SBK2D and 3-dimensional Particle in Cell (3-D PIC) program indicates the reliability of the physical model and simulation code for our program. In addition, the calculation time of SBK2D is only about 1% of that of the 3-D PIC, which makes it more feasible and efficient to calculate and optimize the initial physical parameters for the design of complicated SBK.
机译：为了研究片状速调管（SBK）的非线性波-波相互作用，基于二维棒宏观模型，设计并实现了二维SBK2D仿真代码。在我们的物理模型中，薄板梁是由一系列在（y）和（z）方向上具有非零厚度和长度的杆模拟的，（（y）是薄板梁的窄尺寸方向，而（z）是薄板梁的窄尺寸方向）。光束运动方向）。然后，通过格林函数方法计算棒状宏观粒子之间的空间电荷力，并采用端口逼近法模拟每个腔体的高频场。此外，求解相对论的洛伦兹运动方程以获得进一步的宏观粒子运动的参数，并引入了特定的准则来处理隧道和空腔对片状光束的拦截问题。为了验证我们的仿真代码，SBK2D详细设计，计算和分析了一个八腔W波段SBK。 SBK2D与3D单元中粒子（3-D PIC）程序之间的良好一致性表明了该程序的物理模型和仿真代码的可靠性。此外，SBK2D的计算时间仅为3-D PIC的1％左右，这使得为复杂的SBK设计计算和优化初始物理参数更加可行和高效。

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