تقرير
Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors
| العنوان: | Counter-propagating radiative shock experiments on the Orion laser and the formation of radiative precursors |
|---|---|
| المؤلفون: | Clayson, T., Suzuki-Vidal, F., Lebedev, S. V., Swadling, G. F., Stehle, C., Burdiak, G. C., Foster, J. M., Skidmore, J., Graham, P., Gumbrell, E., Patankar, S., Spindloe, C., Chaulagain, U., Kozlova, M., Larour, J., Singh, R. L., Rodriguez, R., Gil, J. M., Espinosa, G., Velarde, P., Danson, C. |
| سنة النشر: | 2017 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics |
| الوصف: | 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 { $\times 25 \pm 2$}. 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. Comment: HEDLA 2016 conference proceedings |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.hedp.2017.03.002 |
| URL الوصول: | http://arxiv.org/abs/1703.01205 |
| رقم الأكسشن: | edsarx.1703.01205 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.hedp.2017.03.002 |
|---|