Abstract
Typical face-on experiments for Rayleigh-Taylor instability study involve the time-resolved radiography of an accelerated foil with line-of-sight of the radiography along the direction of motion. The usual method which derives perturbation amplitudes from the face-on images reverses the actual image transmission procedure, so the obtained results will have a large error in the case of large optical depth. In order to improve the accuracy of data processing, a new data processing technique has been developed to process the face-on images. This technique based on convolution theorem, refined solutions of optical depth can be achieved by solving equations. Furthermore, we discuss both techniques for image processing, including the influence of modulation transfer function of imaging system and the backlighter spatial profile. Besides, we use the two methods to the process the experimental results in Shenguang-II laser facility and the comparison shows that the new method effectively improve the accuracy of data processing.
Highlights
Understanding and controlling the hydrodynamic instabilities have long been recognized as a critical issue for the success of inertial confinement fusion (ICF)
The usual method which derives perturbation amplitudes from the face-on images reverses the actual image transmission procedure, so the obtained results will have a large error in the case of large optical depth
We use the two methods to the process the experimental results in Shenguang-II laser facility and the comparison shows that the new method effectively improve the accuracy of data processing
Summary
Understanding and controlling the hydrodynamic instabilities have long been recognized as a critical issue for the success of inertial confinement fusion (ICF). The ICF targets must be designed to keep the hydrodynamic instability growth at an acceptable level. Hydrodynamic instabilities play a central role in the evolution of many astrophysical phenomena, such as supernova explosion, high Mach number jets, etc. The optical depth calculated by the usual method gradually deviates from the real value with the increase of perturbation amplitude. Our study is devoted to develop a new processing method to reduce the deviation.
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