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利用一维实验,模拟了惯性约束聚变中烧蚀层中冲击波传输和多次冲击追赶过程.针对聚苯乙烯材料(CH)容易被X射线离化的问题,通过较详细的数值模拟,分析了用Au和Cu做阻挡层对冲击波信号的影响.利用两种不同的辐射源,研究了辐射源两个台阶强度变化对两次冲击信号的影响.经过分析,使用在Al基底上面加厚度为5μm的Au膜以挡X射线的办法,获得了单次冲击在CH材料中加载和减速的清晰条纹图.利用在Al基底上加厚度为2μm的Au膜和厚度为3μm的Cu膜的方法,获得了两次冲击在CH材料中加速、减速和二次加载的条纹图.实验证明,适当加大辐射源两个台阶强度的差别,选用阻抗较低的Cu和阻抗较高的Au配合做阻挡材料会获得更好的双冲击结果.这些实验结果为进一步开展辐射驱动条件下CH材料中的冲击波传输过程提供了很好的基础数据.
A one-dimensional experiment was carried out to simulate the shock wave propagation and the multiple impulse catching-up process in the ablation layer of inertial confinement fusion.Aiming at the problem that polystyrene (CH) is easily ionized by X-ray, the numerical simulation of The effects of Au and Cu as barriers on the shock wave signal were studied.Using two different radiation sources, the influence of the two steps’ intensity of the radiation source on the two impact signals was studied.After the analysis, A 5 m-thick Au film was subjected to X-ray irradiation to obtain a clear stripe pattern of a single impact loading and decelerating in the CH material by using a method of applying an Au film with a thickness of 2 m and a Cu film with a thickness of 3 m on an Al substrate , Two strokes of accelerating, decelerating and secondary loading in CH material were obtained.The experimental results show that the difference between the intensity of the two steps of the radiation source is appropriately increased, and Cu with lower impedance and Au with higher impedance are used in combination The result of the double impact is better for the barrier material.These experimental results provide good basic data for further shock wave transmission in the CH material under the radiation-driven condition.