高功率离子束在偏压电荷收集器内部的电荷输运模拟
Simulation of HPIB propagation in biased charge collector
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摘要: 利用2.5维KARAT软件对高功率离子束在偏压电荷收集器内部的电荷输运过程进行PIC数值模拟，模拟结果表明在偏压电荷收集器内部电荷中和而电流不中和。在模拟中考虑了收集器的几何尺寸和离子束密度，因此模拟结果比一维数值计算的结果更为可靠。同时还模拟了偏置电压与电荷收集器离子收集效率之间的关系，对于峰值能量为500keV的高功率离子束，偏压为－800V即可满足测量要求，这一结果与实验吻合较好。Abstract: A 2.5D PIC simulation using KARAT code for inner charge propagation within biased charge collector for measuring HPIB was presented. The simulation results indicated that the charges were neutralized but the current non-neutralized in the biased charge collector. The influence of ions collected vs biased voltage of the collector was also simulated. －800V biased voltage can meet the measurement of 500keV HPIB, and this is consistent with the experimental results．
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Key words:
- high power ion beams /
- biased charge collector /
- charge propagation
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