3维全电磁粒子模拟软件的外加波与粒子模块设计

Design of external-wave and particle modules for 3D full electromagnetic and PIC simulation software

介绍了3维全电磁粒子模拟软件中外加波边界与粒子边界模块的设计思路和方法,其中外加波边界包括同轴波导、矩形波导、圆柱波导的电磁波输入和输出,以实际算例的形式计算了同轴波导TEM模、矩形波导TE10模、圆柱波导TM01模的传输特性;粒子边界包括粒子的发射与吸收。以实际算例的形式计算了一个用于MILO的同轴二极管爆炸发射模型,对其不同电压下的发射特性以及外加波注入功率进行了研究。研究发现:在外加波电压从低到高的情况下,电子先后表现为出了径向运动,轴向漂移和顺势流3个阶段的发射特性,符合物理规律。所得外加波传输的模式分布和粒子发射特性的计算结果分别验证了外加波和粒子发射模块设计的正确性和可靠性。

The algorithms of external-wave and particle modules were introduced for the 3D full electromagnetic and PIC simulation software. External-wave boundary module was studied, including coaxial line, rectangular and cylindrical waveguide. The transmission characteristics were calculated and analyzed, including TEM in coaxial-line, TE10 in rectangular waveguide and TM01 in cylindrical waveguide. Particle boundary module was also studied, including particle emission and absorption. A coaxial diode was test which was designed for MILO. Its emission characteristic and input power of external-wave were studied and analyzed at different voltages. The simulated results demonstrated that electrons would show three different stage features： radial movement, axial drift, and drifting along same potential value sides, when increasing the voltage of driven pulse. These phenome- na satisfied the objective physical law. All the calculated results validated the credibility of both modules.