279 / 2023-04-24 23:27:31

Development of high energy monochromatic spherical bent crystal imaging in implosion and hydrodynamic instability

X-ray microscope, laser plasmas, diagnositcs, spherical bent crystal

惯性约束聚变物理学 > 驱动器、制靶和诊断-I

High energy monochromatic spherical bent crystal imaging system is developed in LFRC, and high space resolution, high energy resolution and wide field monochromatic X-ray image is obtained. The highest spatial resolution up to 5 microns of the four period grid monochromatic image by spherical bent crystal, base on high power laser faciltiy focusing on vanadium foil with 5.205keV X-ray backlit. The high energy spherical bent crystal imaging system is applied to high power laser facility for implosion compression trajectory, hydrodynamic instability and other experimental studies of laser induced plasmas.

In hydrodynamic instability the grid and gold knife edge examination results were analyzed, with the he use of horizontal and vertical knife edge function derivation and Fourier analysis for two dimensional, space resolution of the MTF values show that that the spatial resolution of imaging system exist differences in two dimensions.By image processing, spectrum distribution does not affects the selection of mixed zone width. The infuence of motion blur on the width of the mixing region is analyzed by the image signal integral measurement of the dynamic sample, which shows that the influence is usually small, usually less than 5 microns. The quality deviation is less than 2%, and the quality invesion results of the signal mode sample in the image are in good agreement with the initial quality.

Base on optimization of one dimensional high spatial resolution of the imaging system flow chart, the implosion dynamics parameters inversion, analyzed for implosion stremline compression maxium velocity and density inversion uncertainty factor analysis, comprehensive analysis of the diagnosis of systemic parameters, including the magnification,space resolution, spatial distortion,time resolution, time resolution, energy resolution and spectrμm response, backlight intensity uniformity, linear dynamic range and other factors, and gives the parameter inversion result uncertainty results. Combined with the laboratory calibration results, the sample free target shooting results and the periodic fringe target test results, the analysis of the streamline of the internal burst velocity uncertainty 2.1%.