双晶单色器结构改进及稳定性研究

Structure Improvement and Stability Research of Double Crystal Monochromator

基于布拉格衍射的双晶衍射结构是常用于同步辐射光束线和单能X射线辐射装置上的单色器的核心部件。实验考察了T结构双晶单色器产生的单能X射线的稳定性,受Channel-cut单色器结构启发设计了新型的双晶单色器结构,并实验测量了衍射产生的单能X射线稳定性。实验结果显示,由于T结构双晶单色器结构缺陷导致其产生的单能X射线注量稳定性较差,而新的双晶单色器结构产生的单能X射线注量稳定性好于1.0%,产生单能X射线的能量范围和注量率都得到明显的提升。

The double crystal diffraction structure based on Bragg diffraction is the core component of the monochromator commonly used in synchrotron radiation beamlines and monochromatic X-ray radiation devices.The stability of the monochromatic X-ray generated by the T-structure double crystal monochromator was investigated.In addition,inspired by the Channel-cut monochromator structure,a new double crystal monochromator structure was designed,and stability of the diffraction-generated monochromatic X-ray was tested.The experimental results show that the stability of the monochromatic X-ray flux generated by the T-structure double crystal monochromator is poor due to its structural defects,while the stability of the monochromatic X-ray flux generated by the new double crystal monochromator structure is better than 1.0%,and the energy range and dose rate of the monochromatic X-ray are significantly improved.