Optimum design and test experiments of spherically bent crystal imaging

Qiang-qiang ZHANG; Lai WEI; Zu-hua YANG; Yong CHEN; Quan-ping FAN; Yin-zhong WU; Lei-feng CAO

doi:10.3788/OPE.20172511.2852

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Optimum design and test experiments of spherically bent crystal imaging

X-ray Optics | 更新时间：2020-07-07

- Optimum design and test experiments of spherically bent crystal imaging
- Optics and Precision Engineering Vol. 25, Issue 11, Pages: 2852-2858(2017)
- 作者机构：
  
  中国工程物理研究院激光聚变研究中心等离子体物理重点实验室, 四川绵阳 621900
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172511.2852
  CLC： TL65
- Received：10 April 2017，
  
  Accepted：04 May 2017，
  
  Published：25 November 2017
- 稿件说明：
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Qiang-qiang ZHANG, Lai WEI, Zu-hua YANG, et al. Optimum design and test experiments of spherically bent crystal imaging[J]. Optics and precision engineering, 2017, 25(11): 2852-2858.
DOI：

Qiang-qiang ZHANG, Lai WEI, Zu-hua YANG, et al. Optimum design and test experiments of spherically bent crystal imaging[J]. Optics and precision engineering, 2017, 25(11): 2852-2858. DOI： 10.3788/OPE.20172511.2852.

摘要

为满足"神光Ⅱ"升级激光装置实验的激光等离子体高空间分辨和窄带宽的精密成像诊断需求，本文研究球面弯晶单色成像技术，并对其进行优化设计及实验验证。首先，使用光线追迹方法分析了成像像距、布拉格角、背光源尺寸等成像系统参数对球面弯晶成像性能的影响，分析了设计参数的变化对成像空间分辨能力的影响，并在X射线管上开展了测试验证实验。研究结果表明：二维成像时，在等分辨成像像距处可以获得较好的成像结果，增大布拉格角可以抑制像差进而提高成像质量，更小的背光源尺寸也有助于提高成像的空间分辨率。测试实验获得了清晰的网格背光成像，成像结果与预期相符，空间分辨率优于14 μm。这一工作有助于球面弯晶成像系统的优化设计及其在激光等离子体精密诊断中的应用。

Abstract

In order to achieve high spatial resolution and narrow spectral bandwidth imaging of laser plasma in updated SG-Ⅱ laser facility

the relations of the imaging quality of spherically bent crystal with image distance

Bragg angle and backlit size were discussed. First

spherically bent crystal imaging at diverse image distances

Bragg angles and backlit sizes were studied with a ray tracing program X-LAB. Then

a test experiment was carried out by using X-ray tube device. The results show that better two-dimension image could be obtained at the image distance of equal resolution of two dimensions

and larger the Bragg angle is

better the imaging is. Furthermore

smaller size of backlit is also helpful to improve the imaging quality. The experiment result agrees well with the expectation

a spatial resolution better than 14 μm in the image of the mesh. The results obtained contribute to the optimization design of the spherically bent crystal imaging system and precision diagnosis of laser plasma.

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