软X射线光导纤维传输特性
Transmission characteristics of soft X-ray through capillary
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摘要: 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。Abstract: 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.
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Key words:
- x-ray lens /
- multiple reflections /
- x-ray capillary /
- transmission efficiency
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