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首页> 美国卫生研究院文献>Journal of Synchrotron Radiation >High-flux hard X-ray microbeam using a single-bounce capillary with doubly focused undulator beam
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High-flux hard X-ray microbeam using a single-bounce capillary with doubly focused undulator beam

机译：使用单反弹毛细管和双聚焦波荡器束的高通量硬X射线微束

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A pre-focused X-ray beam at 12 keV and 9 keV has been used to illuminate a single-bounce capillary in order to generate a high-flux X-ray microbeam. The BioCAT undulator X-ray beamline 18ID at the Advanced Photon Source was used to generate the pre-focused beam containing 1.2 × 1013 photons s−1 using a sagittal-focusing double-crystal monochromator and a bimorph mirror. The capillary entrance was aligned with the focal point of the pre-focused beam in order to accept the full flux of the undulator beam. Two alignment configurations were tested: (i) where the center of the capillary was aligned with the pre-focused beam (‘in-line’) and (ii) where one side of the capillary was aligned with the beam (‘off-line’). The latter arrangement delivered more flux (3.3 × 1012 photons s−1) and smaller spot sizes (≤10 µm FWHM in both directions) for a photon flux density of 4.2 × 1010 photons s−1 µm−2. The combination of the beamline main optics with a large-working-distance (approximately 24 mm) capillary used in this experiment makes it suitable for many microprobe fluorescence applications that require a micrometer-size X-ray beam and high flux density. These features are advantageous for biological samples, where typical metal concentrations are in the range of a few ng cm−2. Micro-XANES experiments are also feasible using this combined optical arrangement.
机译：为了产生高通量的X射线微束，已使用12 keV和9 keV的预聚焦X射线束照射单反射毛细管。使用矢状聚焦，使用高级光子源处的BioCAT波动器X射线束线18ID生成包含1.2×10 13 光子s -1 的预聚焦束双晶体单色仪和双晶镜。毛细管入口与预聚焦光束的焦点对准，以接受波荡器光束的全部通量。测试了两种对准配置：（i）毛细管的中心与预聚焦光束对准（“在线”），以及（ii）毛细管的一侧与光束对准（“离线”） '）。后一种布置提供了更多的光通量（3.3×10 12 光子s -1 ）和较小的光斑尺寸（两个方向上≤10μmFWHM），光子通量密度为4.2 ×10 10 光子s −1 µm −2 。该实验中使用的束线主光学器件与较大的工作距离（约24？mm）毛细管相结合，使其适用于许多需要微米级X射线束和高通量密度的微探针荧光应用。这些特征对于典型金属浓度在几个ng cm -2 范围内的生物样品是有利的。使用这种组合的光学装置，Micro-XANES实验也是可行的。

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