Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators
| Autor: | Salmaan H. Baxamusa, Peter M. Celliers, Michael A. Johnson, Brian J. Watson, T. R. Boehly, N. Whiting, H. Reynolds, Suzanne Ali, J. D. Hughes, K. Engelhorn, Otto Landen, V. A. Smalyuk, S. W. Haan |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review E. 98 |
| ISSN: | 2470-0053 2470-0045 |
| DOI: | 10.1103/physreve.98.033204 |
| Popis: | The U.S. indirect drive inertial confinement fusion (ICF) program uses glow discharge polymer (GDP) as one of the ablator materials for the ICF experiments at the National Ignition Facility (NIF). The performance of those implosions may be adversely affected by photoactivated uptake of oxygen impurities in the surface of the GDP ablator. These impurities can induce significant perturbations in the shock waves generated in the ablator. These perturbed shocks generate mass modulations that are amplified by Rayleigh-Taylor (RT) instability and reduce the performance of the implosions. Here we report on experiments that provide a quantitative connection between photoactivated oxygen uptake in GDP samples and modulations in shock velocities in the samples. The observed shock nonuniformity confirms the hypothesis that irregular oxygenation is a competent seed for the RT and can have a significant effect on NIF GDP implosions. |
| Databáze: | OpenAIRE |
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