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Title: A new data processing technique for Rayleigh-Taylor instability growth experiments

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.

Authors:
; ; ; ; ; ;  [1]; ; ;  [2]
  1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China)
  2. Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China)
Publication Date:
OSTI Identifier:
22611547
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCURACY; AMPLITUDES; COMPARATIVE EVALUATIONS; DATA PROCESSING; DISTURBANCES; EQUATIONS; ERRORS; FOILS; IMAGE PROCESSING; IMAGES; LASER RADIATION; MODULATION; PERTURBATION THEORY; RAYLEIGH-TAYLOR INSTABILITY; TIME RESOLUTION; TRANSFER FUNCTIONS; TRANSMISSION

Citation Formats

Yuan, Yongteng, Tu, Shaoyong, Miao, Wenyong, Yin, Chuansheng, Hao, Yidan, Ding, Yongkun, Jiang, Shaoen, E-mail: jiangshn@vip.sina.com, Wu, Junfeng, Wang, Lifeng, and Ye, Wenhua. A new data processing technique for Rayleigh-Taylor instability growth experiments. United States: N. p., 2016. Web. doi:10.1063/1.4953846.
Yuan, Yongteng, Tu, Shaoyong, Miao, Wenyong, Yin, Chuansheng, Hao, Yidan, Ding, Yongkun, Jiang, Shaoen, E-mail: jiangshn@vip.sina.com, Wu, Junfeng, Wang, Lifeng, & Ye, Wenhua. A new data processing technique for Rayleigh-Taylor instability growth experiments. United States. doi:10.1063/1.4953846.
Yuan, Yongteng, Tu, Shaoyong, Miao, Wenyong, Yin, Chuansheng, Hao, Yidan, Ding, Yongkun, Jiang, Shaoen, E-mail: jiangshn@vip.sina.com, Wu, Junfeng, Wang, Lifeng, and Ye, Wenhua. Wed . "A new data processing technique for Rayleigh-Taylor instability growth experiments". United States. doi:10.1063/1.4953846.
@article{osti_22611547,
title = {A new data processing technique for Rayleigh-Taylor instability growth experiments},
author = {Yuan, Yongteng and Tu, Shaoyong and Miao, Wenyong and Yin, Chuansheng and Hao, Yidan and Ding, Yongkun and Jiang, Shaoen, E-mail: jiangshn@vip.sina.com and Wu, Junfeng and Wang, Lifeng and Ye, Wenhua},
abstractNote = {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.},
doi = {10.1063/1.4953846},
journal = {AIP Advances},
number = 6,
volume = 6,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}
  • We have performed Rayleigh-Taylor instability and feedthrough growth experiments in a 2D cylindrically convergent geometry by imploding gelatin cylinders with high-pressure gases. Instability growth was seeded by fabricating sinusoidal undulations on the outer surfaces of the cylinders, which were then observed during implosion with high-speed framing cameras. These experiments are the first to study feedthrough perturbation growth in an incompressible, convergent geometry. We compare the results to small-amplitude perturbation analysis and to a recent radiation-drive feedthrough experiment. {copyright} {ital 1998} {ital The American Physical Society}
  • Using a hohlraum produced thermal x-ray drive at the National Ignition Facility (NIF) to create pressure by material ablation, a shock exceeding 200 Mbar can be driven through a planar, solid-density target and into a lower-density foam material. The shock driven through the foam is strongly radiative, and this radiation significantly alters the dynamics of the system, including those of the Rayleigh-Taylor (RT) fluid instability at the interface between the two materials. We discuss here the design of experiments that can produce such radiative conditions. One will be able to compare the observed growth rates with an extensive body ofmore » hydrodynamic experiments performed previously. In this paper, we describe a set of 1D simulations performed to understand the mechanisms of stabilization in a strongly radiative Rayleigh-Taylor unstable system. Simulation results are used to calculate modified analytic RT growth rates which have been proposed in the literature. Calculations predict reduced RT spike growth as a result of increases in density gradient scale length and mass ablation from the unstable interface. This work has direct applicability to the observable features in upcoming NIF experiments.« less
  • Turbulent mixing due to the Rayleigh-Taylor instability is experimentally found to vary strongly with the temporal acceleration profile {ital g}({ital t}). For constant {ital g}, the bubble amplitude {ital h}{sub {ital b}} increases as {ital gt}{sup 2} consistent with previous results. For sustained acceleration profiles with {ital dg}/{ital dt}{ne}0, {ital h}{sub {ital b}} increases, not with the displacement {ital Z}={integral}{integral}{ital g}{ital dt}{prime}{ital dt}, but with the length {ital S}=0.5 [{integral}{radical}{ital g}{ital dt}]{sup 2}. For an impulsive acceleration, mixing is minimized with {ital h}{sub {ital b}}{approximately}{ital Z}{sup 0.4}. These results are used to test mix models. {copyright} {ital 1996 The Americanmore » Physical Society.}« less
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