汤姆·马丁二极管的粒子细胞模拟

S. Vickers
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引用次数: 0

摘要

只提供摘要形式。Tom Martin (TM)射线照相二极管由一个安装在杆上的阴极球组成,通过真空与平板金属阳极靶分开。这种配置的二维模型,在AWE脉冲功率机器上,已经使用粒子在细胞(PiC)代码,大规模等离子体(LSP)创建。在3至6.5 MV的电压范围内,将预测输出与测量诊断进行了比较。将阴极球建模为空间电荷有限的电子源,发现预测阻抗历史与测量阻抗历史在定性上一致。模型输出显示高度依赖于阴极发射区域的大小,其范围在预测的二极管阻抗100欧米茄。再加上近似分析方法和大的实验不确定性,这种依赖性导致了一系列与测量数据一致的二极管行为。在该模型中,基于实验观测忽略了目标表面离子的产生和发射。该假设针对LSP目标表面温度预测进行了测试,发现在考虑的电压范围内是一致的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Particle in cell simulations of a Tom Martin diode
Summary form only given. The Tom Martin (TM) radiographic diode comprises of a cathode ball mounted on a stalk, separated by vacuum from a flat plate metal anode target. A 2D model of this configuration, as fielded on AWE pulsed power machines, has been created using the particle in cell (PiC) code, large scale plasma (LSP). Predicted outputs have been compared to measured diagnostics in the voltage range of 3 to 6.5 MV. Modelling the cathode ball as a space charge limited source of electrons, qualitative agreement between the predicted and measured impedance histories is found. The model output is shown to be highly dependent on the size of the cathode emission region, with a range in the predicted diode impedance of 100 Omega. Coupled with approximate analysis methods and large experimental uncertainties, this dependence results in a range of diode behaviours that are consistent with the measured data. In this model, ion creation and emission from the target surface is neglected based on experimental observations. This assumption is tested against LSP target surface temperature predictions and found to be consistent over the voltage range considered.
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