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Title: Indirect-drive ablative Rayleigh-Taylor growth experiments on the Shenguang-II laser facility

In this research, a series of single-mode, indirect-drive, ablative Rayleigh-Taylor (RT) instability experiments performed on the Shenguang-II laser facility [X. T. He and W. Y. Zhang, Eur. Phys. J. D 44, 227 (2007)] using planar target is reported. The simulation results from the one-dimensional hydrocode for the planar foil trajectory experiment indicate that the energy flux at the hohlraum wall is obviously less than that at the laser entrance hole. Furthermore, the non-Planckian spectra of x-ray source can strikingly affect the dynamics of the foil flight and the perturbation growth. Clear images recorded by an x-ray framing camera for the RT growth initiated by small- and large-amplitude perturbations are obtained. The observed onset of harmonic generation and transition from linear to nonlinear growth regime is well predicted by two-dimensional hydrocode simulations.
Authors:
; ; ; ; ; ;  [1] ; ; ; ; ; ; ;  [2] ; ; ;  [1] ;  [3]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China)
  2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 (China)
  3. (China)
Publication Date:
OSTI Identifier:
22253091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FOILS; HARMONIC GENERATION; LASERS; PERTURBATION THEORY; RAYLEIGH-TAYLOR INSTABILITY; SIMULATION; SPECTRA; X RADIATION; X-RAY SOURCES