光栅单色器系统超环面镜转动机构优化设计

陈家华; 徐中民; 甄香君; 薛松

doi:10.11889/j.0253-3219.2018.hjs.41.030101

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光栅单色器系统超环面镜转动机构优化设计

同步辐射技术及应用 | 更新时间：2021-05-19

- 光栅单色器系统超环面镜转动机构优化设计
  封面论文
- Optimized rotation mechanism of the toroidal mirror at grating monochromator system
- 核技术 2018年41卷第3期文章编号：030101
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "陈家华, 男, 1982年出生, 2005年毕业于中国科学技术大学, 博士研究生, 研究领域为同步辐射光束线技术", "CHEN Jiahua, male, born in 1982, graduated from University of Science and Technology of China in 2005, doctoral student, focusing on synchrotron radiation beamline technology" ]
  薛松, E-mail:xuesong@sinap.ac.cn XUE Song, E-mail:xuesong@sinap.ac.cn
- 基金信息：
  
  国家自然科学基金(11175243)
- DOI：10.11889/j.0253-3219.2018.hjs.41.030101
  中图分类号： TL99;TH122
- 收稿日期：2017-11-20，
  
  修回日期：2017-12-11，
  
  纸质出版日期：2018-03-10
- 稿件说明：
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陈家华, 徐中民, 甄香君, 等. 光栅单色器系统超环面镜转动机构优化设计[J]. 核技术, 2018,41(3):030101

Jiahua CHEN, Zhongmin XU, Xiangjun ZHEN, et al. Optimized rotation mechanism of the toroidal mirror at grating monochromator system[J]. Nuclear techniques, 2018, 41(3): 030101
陈家华, 徐中民, 甄香君, 等. 光栅单色器系统超环面镜转动机构优化设计[J]. 核技术, 2018,41(3):030101 DOI： 10.11889/j.0253-3219.2018.hjs.41.030101.

Jiahua CHEN, Zhongmin XU, Xiangjun ZHEN, et al. Optimized rotation mechanism of the toroidal mirror at grating monochromator system[J]. Nuclear techniques, 2018, 41(3): 030101 DOI： 10.11889/j.0253-3219.2018.hjs.41.030101.

摘要

为了减少软X射线谱学显微光束线开光后光栅单色器系统光通量漂移的稳定时间，通过有限元分析开光后超环面镜转动机构的瞬态温度，得到2 h后推杆方向总的线性热膨胀量，以及由此引起聚焦光斑在出射狭缝中心处的水平偏移量。结果显示：超环面镜推杆方向热膨胀量为0.97 μm，聚焦光斑的水平偏移量达到141μm，而狭缝水平开口仅为50 μm，由此推断光通量漂移产生的主要原因是超环面镜吸收的热负载缓慢传导至正弦机构引起Pitch角持续变化。据此设计了超环面镜间接水冷结构，通过对结构优化后的超环面镜箱开光测试，将稳定时间由2 h以上缩短到30 min左右，有效地提升了用户机时的利用效率。

Abstract

Background

Rotation mechanism of the toroidal mirror is a main part of the grating monochromator system

which is a key equipment of the soft X-ray spectromicroscopy beamline. Flux stabilization is essential to every experiment. However

a long stabilization time exceeding 2 h causes a serious waste of beamline time.

Purpose

This study aims to reduce the flux stabilization time of grating monochromator system by optimized design of rotation mechanism of the toroidal mirror.

Methods

By analyzing the temperature increase of the toroidal mirror (TM)

the total linear thermal expansion along the bar direction is calculated to be 0.97 μm after 2 h

which causes a 141 μm horizontal deviation of the focusing spot from the exit slit center while the horizontal size of the slit is only 50 μm. Hence the rotation of the sin-bar mechanism is caused by the absorption heat load of TM with continuous change of incidence angle

which is the main reason of the flux drift. This problem could be solved by adding an indirect water cooling system on both sides of the TM.

Results

The flux stabilization time has been reduced to about 30 min from more than 2 h after adding the cooling system.

Conclusion

The experiment result shows that the optimized design for reducing the flux stabilization time is feasible and effective

and the efficiency of the beamline could be improved greatly.

关键词

Keywords

references

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