SIMULTANEOUS MEASUREMENT OF SHOCK-WAVE VELOCITY AND ULTRA-HIGH DENSITY WITH PENUMBRAL X-RAY BACKLIGHT TECHNIQUE

利用半影 X 射线背光技术同时测量冲击波速度和超高密度

• 批准号: 12308020
• 负责人: NAKANO Motohiro
• 金额: $ 24.46万
• 依托单位: OSAKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12308020/
• 关键词: EQUATION OF STATE; ULTRA HIGH PRESSURE; SHOCK WAVE; INTENSE LASER; INERTIAL FUSION; LASER PLASMA; SHOCK TEMPERATURE MEASURMENT; PENUMBRAL TECHNIQUE; 核融合; レーザープラズマX線; 半影; 画像再構成

The ultra-high pressure-density equation of state (EOS) must be accurately known for inertial fusion energy (IFE) study, astrophysics and other related fields. Hugoniot measurement with impedance-mismatching method is not the best for low-Z materials such as hydrogen/deuterium or plastics. High-resolution radiography allows us to obtain absolute Hugoniot parameters; the shock-wave velocity, particle (pusher) speed, and ultra-high density. We suggest Penumbral coded-aperture-imaging (CAI) as high magnification and resolution radiography. Since EOS experiment need one-dimensional compression by planar shock-waves, the 2-D resolution in space is not required. Thus, we can use a streak camera system as a detector, and also a simple knife-like aperture.In this study, we report a proof of principle experiment to develop an advanced penumbral x-ray backlight technique, streaked penumbral coded-aperture-imaging (SP-CAI). We obtained time-resolved penumbral image of x-ray from laser plasma for the first time. The improved algorithms of two digital inverse filters were tested. The parametric Wiener inverse filter provided a better reconstruction. A 23μm source size at a full width half maximum (FWHM) is measured with a 0.07μm two-point spatial and a 25ps temporal resolutions (1.27 μm overall spatial resolution). Compared to the size of the x-ray light source observed simultaneously with an x-ray pinhole camera, a typical size of the reconstructed source is about half (FWHM) which is the 23μm. This clearly represents a time-integration effect of the pinhole camera image.This imaging method potentially has temporal and spatial resolutions for future high-compressibility measurements in equation-of-state (EOS) studies.

在惯性聚变能研究、天体物理等相关领域中，必须准确地确定超高压-密度状态方程。对于氢/氘或塑料等低Z材料，采用阻抗失配法测量Hugoniot并不是最好的方法。高分辨率射线照相术使我们能够获得绝对的Hugoniot参数;冲击波速度，粒子（推动器）速度和超高密度。我们建议半影编码孔径成像（CAI）作为高放大率和分辨率的X线摄影。由于物态方程实验需要平面激波的一维压缩，因此不需要二维空间分辨率。因此，我们可以使用条纹相机系统作为检测器，也是一个简单的刀状aperture.In这项研究中，我们报告的原理实验证明，开发一种先进的半影X射线背光技术，条纹半影编码孔径成像（SP-CAI）。首次获得了激光等离子体x射线时间分辨半影图像。对两种数字逆滤波器的改进算法进行了测试。参数维纳逆滤波器提供了更好的重建。在0.07μm的两点空间分辨率和25 ps的时间分辨率（总空间分辨率为1.27 μm）下测量了23μm的半高宽（FWHM）源。与用X射线针孔相机同时观察到的X射线光源的尺寸相比，重建源的典型尺寸约为一半（FWHM），即23μm。这清楚地表明了针孔相机图像的时间积分效应。这种成像方法可能具有时间和空间分辨率，用于未来状态方程（EOS）研究中的高压缩性测量。

项目成果

T.Ono, et al.: "Simultaneous Measurement of Temperature Hugoniot of Compressed Polystyrene Using Spectroscopy in Ultraviolet and Visible Range"Annual Progress Report 2002, Institute of Laser Engineering, ILEAPR-2002. 64-65 (2003)

T.Ono 等人：“使用紫外和可见光范围内的光谱法同时测量压缩聚苯乙烯的温度 Hugoniot”2002 年年度进展报告，激光工程研究所，ILEAPR-2002。

K.Fujita, et al.: "Polyimide Equation of State (EOS) Measurement with Super ASHURA Laser"Annual Progress Report 2000, Institute of Laser Engineering, ILEAPR-2000. 209-210 (2001)

K.Fujita 等人：“使用超级 ASHURA 激光进行聚酰亚胺状态方程 (EOS) 测量”2000 年年度进展报告，激光工程研究所，ILEAPR-2000。

K.Takamatsu, et al.: "Simulations of Deuterated Polyethylene EOS using Laser Driven Shock Wave"Annual Progress Report 2000, Institute of Laser Engineering, ILEAPR-2000. 211-212 (2001)

K.Takamatsu 等人：“使用激光驱动冲击波模拟氘化聚乙烯 EOS”2000 年年度进展报告，激光工程研究所，ILEAPR-2000。

T.Ono, et al.: "Simultaneous Measurement of Temperature Hugoniot of Compressed Polystyrene Using Spectroscopy in Ultraviolet and Visible Range"Annual Progress Report 2002, Institute of Laser Engineering. ILEAPR-2002. 64-65 (2003)

T.Ono 等人：“利用紫外和可见光范围内的光谱法同时测量压缩聚苯乙烯的温度 Hugoniot”，2002 年年度进展报告，激光工程研究所。

N.Ozaki, et al.: "Hugoniot measurements of deuterated polyethylene"Inertial Fusion Sciences and Applications 2001 : Proceedings of IFSA 2001. 1112-1115 (2002)

N.Ozaki 等：“氘代聚乙烯的 Hugoniot 测量”惯性聚变科学与应用 2001：IFSA 2001 论文集。1112-1115 (2002)