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Title: Talbot-Lau based Moiré deflectometry with non-coherent sources as potential High Energy Density plasma diagnostic

Abstract

X-ray phase-contrast radiography could better characterize highly localized density gradients expected in High Energy Density (HED) plasma experiments than conventional attenuation radiography. In particular, the Talbot-Lau (TL) grating interferometer, which works with extended and polychromatic x-ray sources, is a potentially attractive HED diagnostic due to its high sensitivity. For HED characterization the TL setup and imaging techniques must be changed from the recently studied medical system. The object magnification must be increased greatly in order to resolve μm scale gradients while the Talbot magnification must be increased in order to keep the gratings away from the plasma. Additionally, techniques for retrieving the density profile from a single plasma image must be developed. We thus study the performance of high magnification TL interferometers, in conjunction with Moiré fringe deflectometry for single image phase retrieval. The results show a very good interferometer contrast (≤30%) at high magnification. The Moiré technique enables measuring both sharp and mild density gradients with good accuracy and spatial resolution. Both the laboratory and simulation studies indicate that the TL based Moiré deflectometry is more sensitive than the propagation phase-contrast method when utilizing an extended x-ray source (∼80 μm). In HED experiments this would allow for less demandingmore » X-ray backlighters than those used at present.« less

Authors:
; ;  [1]
  1. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218 (United States)
Publication Date:
OSTI Identifier:
22217873
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 114; Journal Issue: 16; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ATTENUATION; ENERGY DENSITY; INTERFEROMETERS; PLASMA DENSITY; PLASMA DIAGNOSTICS; SENSITIVITY; SIMULATION; SPATIAL RESOLUTION; X RADIATION; X-RAY SOURCES

Citation Formats

Valdivia, M. P., Stutman, D., and Finkenthal, M. Talbot-Lau based Moiré deflectometry with non-coherent sources as potential High Energy Density plasma diagnostic. United States: N. p., 2013. Web. doi:10.1063/1.4827186.
Valdivia, M. P., Stutman, D., & Finkenthal, M. Talbot-Lau based Moiré deflectometry with non-coherent sources as potential High Energy Density plasma diagnostic. United States. doi:10.1063/1.4827186.
Valdivia, M. P., Stutman, D., and Finkenthal, M. Mon . "Talbot-Lau based Moiré deflectometry with non-coherent sources as potential High Energy Density plasma diagnostic". United States. doi:10.1063/1.4827186.
@article{osti_22217873,
title = {Talbot-Lau based Moiré deflectometry with non-coherent sources as potential High Energy Density plasma diagnostic},
author = {Valdivia, M. P. and Stutman, D. and Finkenthal, M.},
abstractNote = {X-ray phase-contrast radiography could better characterize highly localized density gradients expected in High Energy Density (HED) plasma experiments than conventional attenuation radiography. In particular, the Talbot-Lau (TL) grating interferometer, which works with extended and polychromatic x-ray sources, is a potentially attractive HED diagnostic due to its high sensitivity. For HED characterization the TL setup and imaging techniques must be changed from the recently studied medical system. The object magnification must be increased greatly in order to resolve μm scale gradients while the Talbot magnification must be increased in order to keep the gratings away from the plasma. Additionally, techniques for retrieving the density profile from a single plasma image must be developed. We thus study the performance of high magnification TL interferometers, in conjunction with Moiré fringe deflectometry for single image phase retrieval. The results show a very good interferometer contrast (≤30%) at high magnification. The Moiré technique enables measuring both sharp and mild density gradients with good accuracy and spatial resolution. Both the laboratory and simulation studies indicate that the TL based Moiré deflectometry is more sensitive than the propagation phase-contrast method when utilizing an extended x-ray source (∼80 μm). In HED experiments this would allow for less demanding X-ray backlighters than those used at present.},
doi = {10.1063/1.4827186},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 16,
volume = 114,
place = {United States},
year = {2013},
month = {10}
}