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.

必须以惯性融合能（IFE）研究，天体物理学和其他相关领域来准确知道状态（EOS）的超高压力密度方程。使用阻抗不匹配的方法的Hugoniot测量并不是低Z材料（例如氢/氘或塑料）的最佳选择。高分辨率X光片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。我们认为半肿瘤孔径成像（CAI）是高放大倍率和分辨率射线照相。由于EOS实验需要平面冲击波的一维压缩，因此不需要空间中的2D分辨率。这就是我们可以使用条纹摄像头系统作为检测器，也可以使用简单的刀状光圈。在这项研究中，我们报告了原理实验的证明，以开发出高级的半X射线背光技术，条纹的PENUMBRAL编码姿势模仿（SP-CAI）（SP-CAI）。我们首次获得了从激光等离子体获得X射线的时间分辨的半光图像。测试了两个数字逆滤波器的改进算法。参数Wiener逆滤波器提供了更好的重建。以0.07μm的两点空间和25PS临时分辨率（总空间分辨率）测量了全宽度最大宽度最大（FWHM）的23μm源大小。与仅使用X射线针孔摄像机观察到的X射线光源的大小相比，重建的源的典型尺寸约为23μm（FWHM）。这显然代表了针孔摄像机图像的时间整合效应。此成像方法可能具有临时和空间分辨率，可用于未来的高压缩性测量 - 状态方程（EOS）研究。

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。

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。

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.: "EOS Measurement of Polystyrene Using HIPER Laser System"Annual Progress Report 2001, Institute of Laser Engineering, ILEAPR-2001. 68-69 (2002)

T.Ono 等人：“使用 HIPER 激光系统测量聚苯乙烯的 EOS”2001 年年度进展报告，激光工程研究所，ILEAPR-2001。