脉冲高功率离子二极管的动力学模拟
Dynamic simulations of an ion diode for high power pulsed ion beams
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摘要: 基于等离子体的爆炸发射模型，利用自洽的2.5维的胞中粒子（PIC）模拟程序MAGIC模拟了平板型磁绝缘离子二极管中电子和质子的动力学特性。给出了电压为300kV，外加磁场为2倍临界磁场情况下的二极管特性，阴阳极间隙中带电粒子的空间和相空间分布，以及净电荷密度分布和电场分布，结果表明，引出束流密度比单离子Child-Langmuir公式计算的结果大5倍；外加磁场导致在阴极附近形成虚阴极。空间电荷使得阴阳极间隙中电场扰动和增强。Abstract: Based on the explosive emission model, the self-consistent and 2.5 dimensional electromagnetic particle-in-cell MAGIC code was employed to simulate the dynamics of the particles, including electron and proton, in a planar magnetically insulated ion diode for highpower pulsed ion beams. Time-dependent diode characteristics, spatial and phasespace distributions of the charged particles, as well as the distribution of the net charge density and the electric field in the anode-cathode(AC) gap are presented at a diode voltage of 300kV and a double intensity of the critical magnetic field. The results show that the extracted ion current density is five times larger than the single species limited ion current density according to Child-Langmuir law. The virtual cathode forms in the vicinity of
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