期刊
PHYSICS OF PLASMAS
卷 26, 期 9, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.5099643
关键词
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资金
- Department of Energy (DOE), National Nuclear Security Administration (NNSA), Consortium for Verification Technology (CVT) [DE-NA0002534]
- Office of Defense Nuclear Nonproliferation (DNN) [NA-22]
- National Science Foundation Graduate Research Fellowships Program (NSF GRFP) [DGE 1256260]
- U.S. DOE [DE-AC05-76RLO1830]
This work reports the spatiotemporal diagnostics of uranium species in plasma plumes produced by nanosecond near-infrared laser pulses in a low-pressure environment. Spatially and temporally resolved emission spectroscopy experiments are combined with the modeling of uranium emission for investigating the dynamics of the plume. The Saha-Eggert equation and Boltzmann plots generated from numerous U I transitions are used to infer temperature. This work also reports the measurements of uranium Stark broadening parameters for U I 499.01nm and U II 500.82nm transitions. The Stark widths of select U transitions were measured by comparing their linewidths with the broadening of the O I 777.19nm line. The electron density was found to be of the order of 10(16)cm(-3), while the temperature was found to be in the range of 3000-9000K. In addition to enhancing the fundamental understanding of high-Z plasmas in reduced-pressure environments, the knowledge of Stark broadening parameters could improve the modeling capabilities and analytical performance of techniques that rely on emission plasma spectroscopy.
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