Stability control method of double crystal monochromator based on hybrid control algorithm
Stability control method of double crystal monochromator based on hybrid control algorithm
复制标题
DOI：
10.1016/j.nima.2022.167394
复制
发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Yang Bai;Xuepeng Gong;Qipeng Lu;Yuan Song;Wanqian Zhu;S. Xue;Dazhuang Wang;Zhong-qi Peng;Zhen Zhang
中科院分区：
文献类型：
--
作者：
Yang Bai;Xuepeng Gong;Qipeng Lu;Yuan Song;Wanqian Zhu;S. Xue;Dazhuang Wang;Zhong-qi Peng;Zhen Zhang
同步辐射双晶单色器（DCM）的布拉格角稳定性对硬X射线光束线的光束位置、通量和分辨率至关重要。一般来说，液氮冷却系统引起的振动是影响DCM稳定性的最关键因素。本文针对DCM的稳定性问题，提出了基于混合控制算法的双晶单色器稳定性控制方法。数值计算结果表明，在LN2模态下，该主动控制方法可以大大提高DCM在俯仰方向上的稳定性。俯仰方向上的角位移RMS值从约358.52 nrad减小到约0.071 nrad，减小了99.98%。该方法对国内外同步辐射装置中超高稳定度DCM的研究具有重要意义。
The Bragg angle stability of the DCM (double crystal monochromator) in synchrotron radiation facilities is critical for beam position, flux and resolution of hard X-ray beam lines. Generally, the vibration caused by LN2cooling system is the most critical factor affecting the stability of DCM. In this paper, aiming at the stability of DCM, we propose the stability control method of double crystal monochromator base on hybrid control algorithm. The numerical results show that the stability of the DCM in the pitch direction can be greatly improved by this active vibration control method under LN2mode. The angular displacement RMS value in the pitch direction decreased from about 358.52 nrad to about 0.071nrad, which decreased by 99.98%. Proposed method is of great significance to the research of ultra-high stability DCM in synchrotron radiation facilities all over the world.