Picosecond Radiography Combined with Other Techniques to Investigate Microjetting from Laser Shock-loaded Grooves

被引：3

作者：

de Resseguier, T. ^{[1
]}

Roland, C. ^{[1
,2
]}

Prudhomme, G. ^{[2
]}

Brambrink, E. ^{[3
,4
]}

Franzkowiak, J. E. ^{[2
]}

Loison, D. ^{[5
]}

Lescoute, E. ^{[2
]}

Sollier, A. ^{[2
]}

Berthe, L. ^{[6
]}

机构：

[1] Univ Poitiers, Inst Pprime, CNRS, UPR 3346,ENSMA, F-86961 Futuroscope, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

[3] Univ Paris Saclay, CEA, Ecole Polytech, LULI,CNRS, F-91128 Palaiseau, France

[4] Univ Paris, UPMC, Sorbonne Univ, LULI,CNRS, F-75252 Paris, France

[5] Univ Rennes 1, CNRS, Inst Phys Rennes, F-35042 Rennes, France

[6] ENSAM ParisTech, CNRS, PIMM, 151 Bd Hop, F-75013 Paris, France

来源：

SHOCK COMPRESSION OF CONDENSED MATTER - 2017 | 2018年 / 1979卷

关键词：

D O I：

10.1063/1.5044853

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Debris ejection upon shock breakout at a rough surface is a key issue for many applications, including pyrotechnics and inertial confinement fusion. For a few years, we have used laser driven shocks to investigate microjetting in metallic samples with calibrated grooves in their free surface. Fast transverse optical shadowgraphy, time-resolved measurements of both planar surface and jet tip velocities, and post-shock analysis of recovered material have provided data over ranges of small spatial and temporal scales, short loading pulses (ns-order) and extremely high strain rates. The new experiment presented here involves two laser beams in a pump-probe configuration. Picosecond laser irradiation of a thin copper wire generates x-rays which are used to radiograph the microjets expanding from single grooves in tin and copper samples shock-loaded by a longer, nanosecond laser pulse. Such ultrashort radiography can be used to infer the density gradients along the jets as well as inside the samples deep beneath the grooves. Thus, combining this x-ray probe with the other experimental techniques mentioned above provides a more complete insight into the physics of microjetting at very high loading rates and the ballistic properties of the resulting ejecta.

引用

页数：5

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