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UBC Theses and Dissertations
X-ray sources and shock compression schemes for photoabsorption edge spectroscopy Dyke, Steven R.
Abstract
A scheme to probe the temporal evolution of the K-shell photoabsorption edge in shock compressed aluminum is presented in two components. In the first component, a one dimensional hydrodynamic code coupled to a non-local thermodynamic equilibrium calculation is developed and used to model shock propagation and target preheat in laser irradiated CH-Al-Si multilayer targets. Single and multiple shocks are used to create conditions in the aluminum by which density, temperature and ionization effects on K-shell photoabsorption can be isolated. The final result consists of the optimal laser parameters and target designs for creating well characterized plasma states, necessary for accurate atomic modeling of the K-edge. The second component describes the results of x-ray spectra observed from 12 elements across the periodic table, in search of an emission source to backlight the K-edge measurement. Spectral flatness and high emission levels in the region of 1520-1600 eV around the K-edge of aluminum are the criteria for a suitable backlighter. Lead, gold and yttrium seem promising as backlighter sources, and the emission lines observed in silver provide a convenient spectral calibration source.
Item Metadata
Title |
X-ray sources and shock compression schemes for photoabsorption edge spectroscopy
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1995
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Description |
A scheme to probe the temporal evolution of the K-shell photoabsorption edge in shock
compressed aluminum is presented in two components. In the first component, a one
dimensional hydrodynamic code coupled to a non-local thermodynamic equilibrium calculation
is developed and used to model shock propagation and target preheat in laser
irradiated CH-Al-Si multilayer targets. Single and multiple shocks are used to create conditions
in the aluminum by which density, temperature and ionization effects on K-shell
photoabsorption can be isolated. The final result consists of the optimal laser parameters
and target designs for creating well characterized plasma states, necessary for accurate
atomic modeling of the K-edge. The second component describes the results of x-ray
spectra observed from 12 elements across the periodic table, in search of an emission
source to backlight the K-edge measurement. Spectral flatness and high emission levels
in the region of 1520-1600 eV around the K-edge of aluminum are the criteria for a
suitable backlighter. Lead, gold and yttrium seem promising as backlighter sources, and
the emission lines observed in silver provide a convenient spectral calibration source.
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Extent |
6390484 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-10
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0085443
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.