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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 | 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 {$80 pm 10 km/s$} 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 | Services: | Forum | Review | PDF | Favorites |
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