Effect of shock heating on the stability of laser-driven targets.
The shock heating of a laser-driven, direct-drive target can determine its stability by affecting Rayleigh-Taylor growth rates through target decompression and ablative stabilization. Measurements indicate that pulses that rise rapidly to 10(14) W/cm(2) produce shock-induced temperatures of approximately 25 eV, whereas more slowly rising pulses show less heating. Analysis of the observed target behavior produced by these two pulses demonstrates that shock heating improves hydrodynamic stability because ablative stabilization increases when the targets are preheated by shocks.
Boehly
T R
TR
Laboratory for Laser Energetics, Department of Physics and Astronomy, and Department of Mechanical Engineering, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Delettrez
J A
JA
Knauer
J P
JP
Meyerhofer
D D
DD
Yaakobi
B
B
Town
R P
RP
Hoarty
D
D