| 快点火锥壳靶内爆自发光图像数据处理 |
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| 引用本文： | 毕碧,单连强,周维民,刘东晓,曹磊峰,谷渝秋,张保汉.快点火锥壳靶内爆自发光图像数据处理[J].强激光与粒子束,2014,26(9):092002. |
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| 作者姓名： | 毕碧 单连强 周维民 刘东晓 曹磊峰 谷渝秋 张保汉 |
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| 作者单位： | 1.中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621 900 |
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| 摘 要： | 为研究快点火预压缩过程中导引锥对压缩靶丸芯部辐射对称性的影响,在神光Ⅲ原型上开展了快点火预压缩的自发光测量实验。采集了相同长度黑腔中不同类型靶丸的内爆自发光图像和不同长度黑腔中同类靶丸的内爆自发光图像,利用最小二乘椭圆拟合方法对芯部的自发光半峰值强度等高线进行椭圆拟合,通过椭圆特征来分析靶丸在最强发光时刻的压缩对称性。分析结果表明:导引锥的存在会使发光区域沿着赤道方向拉长,降低了压缩对称性;有锥靶丸在1600μm黑腔内的形变小于在1500μm和1700μm黑腔内的形变,压缩对称性可以通过调整黑腔长度来控制。
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| 关 键 词： | 快点火 导引锥 自发光图像 辐射对称性 椭圆拟合 黑腔长度 |
| 收稿时间： | 2013/12/10 |
Implosion emission image processing for cone-shell target of fast ignition |
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| Affiliation: | 1.Research Center of Laser Fusion,CAEP,P.O.Box 919-986-6,Mianyang 621900,China |
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| Abstract: | In order to study the influence of guiding cone on radiation symmetry of compressed core, X-ray emission measurements in fast ignition pre-compression were tested on Shenguang Ⅲ prototype facility. Emission images of different targets in hohlraums with the same length and that of the same target in hohlraums with different lengths were recorded. Least-square ellipse fitting was applied to 50% peak intensity contour, thus the ellipse characters could be used to numerically analyze the core compression symmetry at peak emission time. The results validate that the compression symmetry is reduced, as the emission region is stretched in equatorial direction, if the target is attached to a gold cone. The compression symmetry can be adjusted by hohlraum length, as the shape deformations of cone-guide target in hohlraum with 1600 m length is less than that in hohlraums with 1500 m and 1700 m length. |
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| Keywords: | fast ignition guiding cone self-emission image radiation symmetry ellipse fitting hohlraum length |
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