X ray radiographic imaging of hydrodynamic phenomena in radiation driven materials: Shock propagation, material compression and shear flow

Details X ray radiographic imaging of hydrodynamic phenomena in radiation driven materials: Shock propagation, material compression and shear flow X ray radiographic imaging of hydrodynamic phenomena in radiation driven materials: Shock propagation, material compression and shear flow

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aps..meet....1h&link_type=abstract

Presented at the Fall Meeting of the Plasma Physics Division of the American Physical Society, St. Louis, MO, 1-5 Nov. 1993

Physics

Plasma Physics

Ablation, Flow Stability, Hydrodynamics, Nova Laser System, Shear Flow, Shock Loads, X Ray Imagery, Hugoniot Equation Of State, Inertial Confinement Fusion

Scientific paper

One- and two-dimensional, time resolved x ray radiographic imaging at high photon energy (5-7 keV) is used to study shock propagation, material motion and compression, and the effects of shear flow in solid density samples which are driven by x ray ablation with the Nova laser. By backlighting the samples with x rays and observing the increase in sample areal density due to shock compression, the authors directly measure the trajectory of strong shocks (approximately 40 Mbar) in flight, in solid density plastic samples. Doping a section of the samples with high-Z material (Br) provides radiographic contrast, allowing the measurement of the shock induced particle motion. Instability growth due to shear flow at an interface is investigated by imbedding a metal wire in a cylindrical plastic sample and launching a shock in the axial direction. Time resolved radiographic measurements are made with either a slit-imager coupled to an x ray streak camera or a pinhole camera coupled to a gated microchannel plate detector, providing approximately 10-(mu)m spatial and approximately 100-ps temporal resolution.

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