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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

24.0K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Fixed Target Serial Data Collection at Diamond Light Source
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分布式聚焦降低了X射线光束线上的镜像误差灵敏度.

Louisa A Pickworth, Rami Sankari

    Applied optics
    |September 14, 2023
    PubMed
    概括

    制造大型,千米级半径镜子用于同步光线线是具有挑战性的. 使用两个镜子的分布式聚焦显著降低了对半径误差的灵敏度,改善了先进光源的成像质量.

    科学领域:

    • 光学是什么?光学是什么?光学是什么?
    • 材料科学 材料科学 材料科学
    • 同步子辐射的辐射

    背景情况:

    • 现代同步光源需要长光线,具有大半径,低曲率的镜子.
    • 制造这些镜子以纳米级精度是困难的,导致数字错误降低光束质量.
    • 圆形镜的半径误差影响着垂直和水平方向的聚焦,使光线线设计复杂化.

    研究的目的:

    • 介绍一种替代方法,以减轻同步光线线镜中的半径误差.
    • 为了减少平面格子单色光线对聚焦光学中的大半径误差的敏感性.
    • 为了保持成像性能,尽管在镜子曲率的制造公差.

    主要方法:

    • 通过两个被动的,半径固定的镜子来研究分布式聚焦.
    • 在单镜配置中分析了半径误差对成像的影响.
    • 在单阶段和分布式聚焦系统之间比较了对半径误差的灵敏度.

    主要成果:

    • 与单镜聚焦相比,使用两个镜子的分布式聚焦大大降低了对半径误差的敏感性.
    • 半径公差以前被认为是不可接受的单阶段聚焦在分布式系统中容纳.
    • 拟议的方法保持成像能力,而不会影响光束线性能.

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    X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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    结论:

    • 分布式聚焦提供了一个强大的解决方案,用于管理大半径同步镜镜中的图形错误.
    • 这种方法提高了构建先进光线线的可行性,并减少了对镜子制造的严格要求.
    • 这些发现特别适用于像MAX IV.这样的设施中的平面格单色光线线.