Radial Structure of Shell Modulations near Peak Compression of Spherical Implosions
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LLE Review, Volume 92 15
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Analyzing the Structure of Shell Modulations Around Peak Compression of Spherical Implosions
Programs were created to analyze the structure of shell modulations at peak compression of spherical implosions. Measurements of the modulations were taken by using absorption of titanium-doped layers placed at distances 1,5,7, and 9 pm from the inner surface of 20 pm-thick plastic CH shells filled with 18 atm of D ~ H ~ gas. These nonuniformities were measured using ratios of monochromatic tar...
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The evolution of shell modulations near peak compression of direct-drive spherical-target implosions has been measured using the 60-beam, 30-kJ UV OMEGA laser system. The spatial size and amplitude of shell-areal-density modulations decrease during the target compression, then increase during its decompression as expected. The shell uniformity at peak compression has been increased by reducing ...
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204 LLE Review, Volume 84 Introduction Measurements of shell integrity are very important for understanding and quantifying the performance degradation of spherical implosions in inertial confinement fusion (ICF).1 Such measurements are performed at the peak of compression of the implosion, when maximum density and temperature are achieved. At this time, the hot core and the inner surface of th...
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168 LLE Review, Volume 72 The cold, compressed shell in laser-driven implosions can normally be imaged only by backlighting because its x-ray emission is very weak. However, a high-Z–doped shell can be imaged using the Kα line radiation, which fluoresces due to excitation by the intense radiation from the hot core. We show results from titanium-doped target implosions where the onedimensional s...
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