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29 March 2024
 
  » arxiv » 1703.1205

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Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors
T. Clayson ; F. Suzuki-Vidal ; S.V. Lebedev ; G.F. Swadling ; C. Stehle ; G. C. Burdiak ; J. M. Foster ; J. Skidmore ; P. Graham ; E. Gumbrell ; S. Patankar ; C. Spindloe ; U. Chaulagain ; M. Kozlova ; J. Larour ; R.L. Singh ; R. Rodriguez ; J. M. Gil ; G. Espinosa ; P. Velarde ; C. Danson ;
Date 3 Mar 2017
AbstractWe present results from new experiments to study the dynamics of radiative shocks, reverse shocks and radiative precursors. Laser ablation of a solid piston by the Orion high-power laser at AWE Aldermaston UK was used to drive radiative shocks into a gas cell initially pressurised between $0.1$ and $1.0 bar$ with different noble gases. Shocks propagated at {$80 pm 10 km/s$} and experienced strong radiative cooling resulting in post-shock compressions of { $ imes 25 pm 2$}. A combination of X-ray backlighting, optical self-emission streak imaging and interferometry (multi-frame and streak imaging) were used to simultaneously study both the shock front and the radiative precursor. These experiments present a new configuration to produce counter-propagating radiative shocks, allowing for the study of reverse shocks and providing a unique platform for numerical validation. In addition, the radiative shocks were able to expand freely into a large gas volume without being confined by the walls of the gas cell. This allows for 3-D effects of the shocks to be studied which, in principle, could lead to a more direct comparison to astrophysical phenomena. By maintaining a constant mass density between different gas fills the shocks evolved with similar hydrodynamics but the radiative precursor was found to extend significantly further in higher atomic number gases ($sim$$4$ times further in xenon than neon). Finally, 1-D and 2-D radiative-hydrodynamic simulations are presented showing good agreement with the experimental data.
Source arXiv, 1703.1205
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