光栅单色器系统超环面镜转动机构优化设计

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0.97μm,聚焦光斑的水平偏移量达到141μm,而狭缝水平开口仅为50μm,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。...

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Bibliographic Details
Published in核技术 Vol. 41; no. 3; pp. 1 - 6
Main Author 陈家华;徐中民;甄香君;薛松
Format Journal Article
LanguageChinese
Published 中国科学院上海应用物理研究所 嘉定园区 上海 201800 10.03.2018
中国科学院大学 北京 100049%中国科学院上海应用物理研究所 嘉定园区 上海 201800
Subjects
光栅单色器系统;超环面镜;光通量漂移;线性热膨胀;间接水冷
光通量漂移
Linear thermal expansion
光栅单色器系统
Grating monochromator system
Flux drift
间接水冷
Toroidal mirror
Indirect water cooling
超环面镜
线性热膨胀
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ISSN0253-3219
DOI10.11889/j.0253-3219.2018.hjs.41.030101

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Summary: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0.97μm,聚焦光斑的水平偏移量达到141μm,而狭缝水平开口仅为50μm,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。
Bibliography:Grating monochromator system;Toroidal mirror;Flux drift;Linear thermal expansion;Indirect water cooling
CHEN Jiahua1,2, XU Zhongmin1, ZHEN Xiangjun1,XUE Song1（1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China）
31-1342/TL
[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
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2018.hjs.41.030101