“点投影”keV波段X射线吸收谱的实验技术研究

Experimental Research on“Point Projection” keV Wave-range X-ray Absorption Spectroscopy

报道了一项高密度激光等离子体ｋｅＶ波段Ｘ射线吸收谱工作。实验上采用称为＂点投影（ＰｏｉｎｔＰｒｏｊｅｃｔｉｏｎ）＂的靶场光学方案，成功地获得了高空间分辨（＜２４μｍ）的类氦铝１ｓ２－１ｓ２ｐ及类氖锗２ｐ－３ｄ共振吸收谱信号，为Ｘ激光及激光核聚变研究提供了一种新的参量诊断方案。

We have developed and successfully demonstrated a ' point projection absorption spectroscopy (PPAS) ' technique to record keV absorption spectra in the coronal region of laser produced germanium plasmas and aluminium plasmas which provide spatial information in the coma at a ￣ 24 μm level resolution and can freeze the motion of the expanding plasmas at a≈250 ps level.