Abstract
Measurements of blast waves produced by laser heating of spherical glass-shell targets in an atmosphere of 20 Torr helium are described. These measurements made use of a streak camera, monitoring the self-luminosity of the strong shock, a blast probe detecting the ionization behind the shock front, and a piezoelectric pressure probe recording the pressure pulse of the shock. The time history of the blast wave is used to determine the kinetic energy of target dissembly via a simple model which is applicable in both the strong-shock and acoustic regions. These measurements show that the inferred blast-wave energy increases for larger radius–time-shock coordinates. This anomalous effect is ascribed to ’’fast’’ ion preheating of the ambient helium gas in front of the shock wave.
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