基于激光驱动等离子体X光源的X射线相衬成像

In-line phase-contrast imaging with laser-based hard X-ray source

为了诊断惯性约束聚变(ICF)内爆靶丸球壳的多层信息,在神光Ⅱ激光器上对激光驱动等离子体X光源的相衬成像进行了研究。利用神光Ⅱ第9路激光驱动平面Ti靶获得X光源,在10μm的针孔约束下作为次级点光源对样品成像,用X光胶片记录。成功地将相衬成像技术应用于ICF实验,综合考虑成像放大倍数、分辨力、成像衬度和抑制烧蚀碎片等因素,选择合适的实验条件,成功获得了清晰的双层内爆靶丸球壳结构,空间分辨力优于10μm。

The research on in-line phase-contrast imaging with laser-based hard X-ray source was carried out on Shanghai ＂Shenguang Ⅱ＂ laser facility,in which the X-rays emitted from laser-produced plasma Ti targets passed through the pinhole with diameter 10 μm,and the X-ray film was used to record the result. Multi-layer capsule structure was obtained in this experiment with the spatial resolution better than 10 μm. The research indicates that the phase contrast imaging have advantages in low-Z material diagnosis and can be used in ICF experiment.