Improve beam position stability of SSRF BL15U beamline by using beam intensity feedback

LI Guoqiang LIANG Dongxu YAN Fen LI Aiguo YU Xiaohan

doi:10.11889/j.0253-3219.2013.hjs.36.050101

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Improve beam position stability of SSRF BL15U beamline by using beam intensity feedback

更新时间：2021-03-05

- Improve beam position stability of SSRF BL15U beamline by using beam intensity feedback
- NUCLEAR TECHNIQUES Vol. 36, Issue 5, Article number: 050101(2013)
- 作者机构：
  
  中国科学院上海应用物理研究所嘉定园区
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2013.hjs.36.050101
  CLC： TL501
- Published：01 May 2013
- 稿件说明：
移动端阅览
[1]李国强,梁东旭,闫芬,李爱国,余笑寒.利用光强反馈提高上海光源BL15U线站光束位置的稳定性[J].核技术,2013,36(05):1-4.

LI Guoqiang LIANG Dongxu YAN Fen LI Aiguo YU Xiaohan. Improve beam position stability of SSRF BL15U beamline by using beam intensity feedback[J]. Nuclear techniques, 2013, 36(5): 050101
[1]李国强,梁东旭,闫芬,李爱国,余笑寒.利用光强反馈提高上海光源BL15U线站光束位置的稳定性[J].核技术,2013,36(05):1-4. DOI： 10.11889/j.0253-3219.2013.hjs.36.050101.

LI Guoqiang LIANG Dongxu YAN Fen LI Aiguo YU Xiaohan. Improve beam position stability of SSRF BL15U beamline by using beam intensity feedback[J]. Nuclear techniques, 2013, 36(5): 050101 DOI： 10.11889/j.0253-3219.2013.hjs.36.050101.

摘要

上海光源（SSRF）硬X射线微聚焦线站（BL15U）利用光强反馈的方法提高了光束位置的稳定性。反馈控制系统由光束线光强探测器和双晶单色器第二晶体的投角（pitch2）微调机构组成

通过调节pitch

使光强达到并保持在最大值

消除由单色器双晶、平行度变化造成的光束位置不稳定。实验结果表明

加入反馈后显著抑制了频率10 Hz以下的垂直方向光束位置晃动

将能量扫描时光束位置的稳定性提高了5倍以上。采用反馈系统后

样品台处光斑垂直方向的不稳定性得到显著控制

达到预期效果。

Abstract

Background:The shaking of micro-focus spot in the vertical direction is found during the energy scan experiments

such as XAFS scan.The beam position of vertical direction changes obviously with the energy.Purpose: In order to make the beam position shaking amplitude less than 1/10 of the beam size.Methods:The beam position stability of SSRF BL15U beamline is improved by using beam intensity feedback.The feedback system include beam intensity monitor of the beamline and fine adjust mechanism of pitch

（the pitch angle of the second crystal of the double crystal monochromator）.The feedback control of the beam position is realized by adjusting the pitch

to fix beam intensity at its maximum value.Results:The test results show that the vertical beam vibration below 10 Hz frequency is significantly reduced and also the beam position stability during photon energy scan is improved by more than 5 times.Conclusions:By adopting the new feedback systems

the stability of the beam spot on the specimen stage was dramatically improved which achieved the anticipated target.

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