Title :
Indirectly driven colliding foil experiments at 0.75 Gbar
Author :
Cauble, R. ; Phillion, D.W. ; Lee ; Kilkenny, J.D.
Author_Institution :
Lawrence Livermore Nat. Lab., Livermore, CA, USA
Abstract :
Summary form only given. The Nova laser is used to create a high-intensity radiation field inside a millimeter-scale hohlraum. The X-ray flux from the hohlraum is used to accelerate a thin gold foil through a void region, causing this flyer foil to collide with a stationary target foil, also of gold. Acceleration was accomplished by ablation of a CH disk attached to the flyer foil. Both foils were more than 500 /spl mu/m in diameter. The target foil was made in two thicknesses so that a shock transit time could be measured by observing the luminous shock breakout on the rear side with a streaked optical pyrometer. Several shots were made. Comparing the present results with established equations-of-state, it was determined that the dynamic pressure in the gold target foil was consistently about 0.75 Gbar. One-dimensional hydro simulations predict a shock pressure for this experiment to be near this figure. In addition, the target foil has been modified to measure the speed of the flyer foil.
Keywords :
gold; 0.75/spl times/10/sup 9/ bar; 500 micron; CH disk; Nova laser; X-ray flux; ablation; equations-of-state; flyer foil; high-intensity radiation field; indirectly driven colliding foil experiments; luminous shock breakout; millimeter-scale hohlraum; one-dimensional hydro simulations; shock pressure; shock transit time; stationary target foil; streaked optical pyrometer; thin Au foil; Acceleration; Electric shock; Equations; Gold; Laser ablation; Predictive models; Thickness measurement; Time measurement; Velocity measurement; X-ray lasers;
Conference_Titel :
Plasma Science, 1993. IEEE Conference Record - Abstracts., 1993 IEEE International Conference on
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-1360-7
DOI :
10.1109/PLASMA.1993.593605
