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Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors

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Title: Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors
Authors: Clayson, T
Suzuki-Vidal, F
Lebedev, SV
Swadling, GF
Stehle, C
Burdiak, GC
Foster, JM
Skidmore, J
Graham, P
Gumbrell, E
Patankar, S
Spindloe, C
Chaulagain, U
Kozlova, M
Larour, J
Singh, RL
Rodriguez, R
Gil, JM
Espinosa, G
Velarde, P
Danson, C
Item Type: Journal Article
Abstract: We 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 ± 10 km/s and experienced strong radiative cooling resulting in post-shock compressions of ×25 ± 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 (∼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.
Issue Date: 4-Mar-2017
Date of Acceptance: 2-Mar-2017
URI: http://hdl.handle.net/10044/1/48780
DOI: https://dx.doi.org/10.1016/j.hedp.2017.03.002
ISSN: 1878-0563
Publisher: Elsevier
Start Page: 60
End Page: 72
Journal / Book Title: High Energy Density Physics
Volume: 23
Copyright Statement: © 2017 The Authors. Published by Elsevier B.V. This is an open access article article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: The Royal Society
Funder's Grant Number: UF120135
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
Radiative shock
Radiative precursor
Counter propagating shocks
LABORATORY EXPERIMENTS
ASTROPHYSICS
INSTABILITY
JETS
physics.plasm-ph
Fluids & Plasmas
02 Physical Sciences
Notes: HEDLA 2016 conference proceedings
Appears in Collections:Physics
Plasma Physics
High Energy Physics
Faculty of Natural Sciences



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