Experimental evidence of a bubble-merger regime for the Rayleigh-Taylor Instability at the ablation front

Autor: Jave Kane, S. Liberatore, Bruce Remington, V. A. Smalyuk, L. Masse, S. W. Haan, E Giraldez, A. Nikroo, A. S. Moore, David Martinez, M Farrell, R. Seugling, A. Casner
Rok vydání: 2016
Předmět:
Zdroj: Journal of Physics: Conference Series. 717:012010
ISSN: 1742-6596
1742-6588
DOI: 10.1088/1742-6596/717/1/012010
Popis: Under the Discovery Science program, the longer pulses and higher laser energies provided by the National Ignition Facility (NIF) have been harnessed to study, first time in indirect-drive, the highly nonlinear stage of the Rayleigh-Taylor Instability (RTI) at the ablation front. A planar plastic package with pre-imposed two-dimensional broadband modulations is accelerated for up to 12 ns by the x-ray drive of a gas-filled gold radiation cavity with a radiative temperature plateau at 175 eV. This extended tailored drive allows a distance traveled in excess of 1 mm for a 130 μm thick foil, a factor 3x larger than previously achieved on other laser facilities. As a consequence, we have measured the ablative RTI in transition from the weakly nonlinear stage up to the deep nonlinear stage for various initial conditions. A bubble merger regime has been observed and the ablative stabilization strength varied by changing the plastic dopant from iodine to germanium.
Databáze: OpenAIRE