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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

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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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X-ray Diffraction of Biological Samples01:10

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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基于X射线衍光测量实验的X射线晶体光谱学高度定向的溶性石墨反射器的性能特征.

Dian Lu1,2, Zhifeng Cheng3, Tianlei Zhao4

  • 1Institute of Plasma Physics, HFIPS, Chinese Academy of Science, Hefei 230031, China.

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概括

这项研究评估了使用X射线微波测量 (XRD) 的托卡马克X射线水晶光谱 (XCS) 的高定向烧化石墨 (HOPG) 反射器. 该方法精确地测量HOPG性能,帮助未来的诊断系统设计.

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科学领域:

  • 等离子体物理学和核聚变能源研究.
  • 材料科学和特征学.
  • 在X射线光学和仪器仪表.

背景情况:

  • 像ITER一样,下一代托卡马克需要先进的诊断系统.
  • 射线晶体光谱 (XCS) 对于血诊断至关重要.
  • 高度定向的 Pyrolytic Graphite (HOPG) 是XCS反射器的一个候选材料.

研究的目的:

  • 实验评估用于XCS系统的HOPG反射器的性能.
  • 建立一种精确的方法来表征HOPG反射器的特性.
  • 支持未来托卡马克诊断系统的设计.

主要方法:

  • 使用X射线微光度量 (XRD) 进行实验评估.
  • 测量HOPG样本的角反应和反射率.
  • 进行了一个示范性的XRD实验来验证方法.

主要成果:

  • XRD方法为HOPG反射器提供了准确的角响应数据.
  • 成功地获得了HOPG的反射度测量.
  • 实验方法适用于详细的HOPG表征.

结论:

  • 在XCS.中评估HOPG反射器性能时,XRD方法有效.
  • 精确的HOPG表征对于设计可靠的托卡马克诊断是必不可少的.
  • 这项研究有助于开发用于核聚变装置的先进XCS系统.