Ablation front Rayleigh-Taylor growth experiments in spherically convergent geometry

Details Ablation front Rayleigh-Taylor growth experiments in spherically convergent geometry Ablation front Rayleigh-Taylor growth experiments in spherically convergent geometry

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phpl....7.2033g&link_type=abstract

Physics of Plasmas, Volume 7, Issue 5, pp. 2033-2039 (2000).

Physics

30

Macroinstabilities, Plasma Production And Heating By Laser Beams, Theory, Design, And Computerized Simulation

Scientific paper

Experiments were performed on the Nova laser [E. M. Campbell et al., Rev. Sci. Instrum. 57, 2101 (1986)], using indirectly driven capsules mounted in cylindrical gold hohlraums, to measure the Rayleigh-Taylor growth at the ablation front by time-resolved radiography. Modulations were preformed on the surface of Ge-doped plastic capsules. With initial modulation amplitude of 2-2.5 μm, growth factors of about six in optical depth were seen, in agreement with simulations using the radiation hydrocode FCI2 [G. Schurtz, La fusion thermonucleaire inertielle par laser, edited by R. Dautray et al. (Eyrolles, Paris, 1994), Vol. 2]. With initial modulation amplitude of 0.5 μm and a longer drive, growth factors of about 100-150 in optical depth were seen. Comparable planar experiments showed growth factors of about 40 in optical depth. Analytical models predict the observed growth factors.

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