Fourier-space nonlinear Rayleigh-Taylor growth measurements of 3D laser-imprinted modulations in planar targets |
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Authors: | Smalyuk V A Sadot O Delettrez J A Meyerhofer D D Regan S P Sangster T C |
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Institution: | Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA. |
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Abstract: | Nonlinear growth of 3D broadband nonuniformities was measured near saturation levels using x-ray radiography in planar foils accelerated by laser light. The initial target modulations were seeded by laser nonuniformities and later amplified during acceleration by Rayleigh-Taylor instability. The nonlinear saturation velocities are measured for the first time and are found to be in excellent agreement with Haan predictions. The measured growth of long-wavelength modes is consistent with enhanced, nonlinear, long-wavelength generation in ablatively driven targets. |
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