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Spectral and Hydrodynamic Modeling of X-Ray Photoionization Experiments

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dc.contributor.advisor Cohen, David H. Rosenberg, Michael J. 2013-03-15T19:39:39Z 2013-03-15T19:39:39Z 2008
dc.description.abstract We have extensively modeled a neon photoionization experiment on the Z machine at Sandia National Laboratories. Using a suite of modeling codes, we have reproduced the experimental environment and simulated the physical conditions inside the neon plasma. We have matched a synthetic spectrum to the absorption spectrum taken during the experiment. Analyzing the spectra by measuring equivalent widths of lines and plotting them on a curve of growth, we have determined that the ionization balance of 1 % Ne VIII, 95% Ne IX, and 4% Ne X for the laboratory spectrum nearly matches the simulated ionization balance of 1 % Ne VIII, 91 % Ne IX, and 8% Ne X. We have found our simulated plasma to be slightly overionized in comparison to the neon in the experiment, though the simulated physical conditions can still be matched to features in the absorption spectrum. Our analysis also indicates that photoionization is a necessary ingredient in the ionization of the neon gas cell plasma. With more refined spectral analysis t echniques, we can provide astronomers with information that they can use to better interpret spectra of photoionized astrophysical objects. en
dc.description.sponsorship Swarthmore College. Dept. of Physics & Astronomy en
dc.language.iso en_US en
dc.rights Full copyright to this work is retained by the student author. It may only be used for non-commercial, research, and educational purposes. All other uses are restricted.
dc.title Spectral and Hydrodynamic Modeling of X-Ray Photoionization Experiments en
dc.type Thesis (B.A.)

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