Performance calculations of the X-ray powder diffraction beamline at NSLS-II
Performance calculations of the X-ray powder diffraction beamline at NSLS-II
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DOI：
10.1107/s0909049512049175
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发表时间：
2013-03-01
影响因子：
2.5
通讯作者：
Dooryhee, Eric
中科院分区：
文献类型：
--
作者：
Shi, Xianbo;Ghose, Sanjit;Dooryhee, Eric
国家同步辐射光源II上的X射线粉末衍射(XPD)光束线是一种高通量、高分辨率的多用途高能X射线衍射光束线。该光束线使用矢状弯曲的双劳厄晶体单色器来提供大能量范围(3070keV)的X射线。本文给出了XPD光束线的光学设计和计算性能。用SRW程序模拟了衰减摆动器源，并设计了滤光器系统，以优化光子通量和降低第一光学元件上的热负荷。利用SHADOW程序对两种工作模式下的最终波束线性能进行了仿真。首次在弯曲劳厄晶体单色仪的光线跟踪中引入了多层模型并加以实现。对垂直聚焦镜的优化设计和光学性能进行了讨论。最后，用解析的方法描述了XPD光束线的仪器分辨函数。
The X-ray Powder Diffraction (XPD) beamline at the National Synchrotron Light Source II is a multi-purpose high-energy X-ray diffraction beamline with high throughput and high resolution. The beamline uses a sagittally bent double-Laue crystal monochromator to provide X-rays over a large energy range (3070 keV). In this paper the optical design and the calculated performance of the XPD beamline are presented. The damping wiggler source is simulated by the SRW code and a filter system is designed to optimize the photon flux as well as to reduce the heat load on the first optics. The final beamline performance under two operation modes is simulated using the SHADOW program. For the first time a multi-lamellar model is introduced and implemented in the ray tracing of the bent Laue crystal monochromator. The optimization and the optical properties of the vertical focusing mirror are also discussed. Finally, the instrumental resolution function of the XPD beamline is described in an analytical method.