软X射线光导纤维传输特性

 为优化设计软X射线聚束透镜，使之与软X射线源配合能最大限度地获得高强度软X射线束，在北京同步辐射装置软X光站3W1B束线上，对不同能量软X射线（50～1 500 eV）在不同规格毛细管光导纤维中的传输特性进行研究。研究结果表明：玻璃毛细管对软X光有较高的传输效率，毛细管内径越小，曲率越小，光子能量越小，则传输效率越大；使用含硼（B）量高的DM308型号玻璃材料拉制成内直径为0.45 mm﹑外直径为0.6 mm的毛细管组成的软X光聚束透镜有较高的传输效率，该规格毛细管可以将能量为250 eV的X射线传播方向改变26°后，其出射能量是入射能量的12%；使用由该规格毛细管设计的软X射线聚束透镜同软X射线点光源组合，收光角可以达到30°，透镜焦点处的功率密度是不使用透镜时的104倍。

Transmission character of soft X-ray through capillaries

Experimental research on X-ray guiding capillaries is the foundation of X-ray lens design.The experimental results of measuring transmission efficiency within the energy range of 50 eV~1.5 keV for a variety type of capillaries are presented,including different materials,different inner radius and different bent radius.It is shown that the transmission efficiency of curved capillary increases with the decrease of the X-ray energy,the inner diameter of capillary,and the bend radius of curved capillary.As a result,the capillary manufactured of glass DM308 with an inner diameter of 0.45 mm and an outer diameter of 0.60 mm is the best choice for the soft X-ray lens.