强流脉冲离子束辐照靶材烧蚀效应二维数值研究

对强流脉冲离子束(IPIB)辐照Ti靶的烧蚀效应进行了二维数值研究.得到了表面烧蚀物质随脉冲时间的变化关系.得出TEMP Ⅱ 型加速器产生的脉冲束流辐照靶材时引起的汽、液化均是从表面开始、并且汽化过程中表面物质被层层烧蚀的结论.同时，得到中心区的平均烧蚀速度为10m/s 数量级，它远小于产生的烧蚀等离子体的喷发速度.得到脉冲期间靶材内部不同位置烧蚀斑痕形状的时间演化过程，以及束流中含有的离子种类分额不同时IPIB辐照过程产生的不同效果.关键词：强流脉冲离子束靶烧蚀过程二维数值模拟

Two-dimension numerical research on the ablation of target irradiated by intense pulsed ion beam

Two-dimension numerical research has been carried out on the ablation of metal Ti target irradiated by intense pulsed ion beam(IPIB) produced by TEMP Ⅱ accelerator. Spatial and temporal evolution of the ablation process of the target during the pulse time has been obtained. Melting and evaporation processes begin from the surface of the target and the ablation process of target is layer by layer while the target is irradiated by IPIB. Meanwhile, we have also obtained the result that the average ablation velocity in center region of the target is about 10m/s, which is far lower than the ejection velocity of the plume plasma formed during the pulse time. The effects have been compared for different ratios of two kinds of ions in the pulsed beams produced by using different kinds of materials as the anode of magneto-isolated diosts during the irradiation time.