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Fresnel zone plate development for x-ray radiography of hydrodynamic instabilities at the National Ignition Facility
The study of Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities in a planar geometry at high energy densities at the National Ignition Facility (NIF) requires high spatial resolution imaging. We demonstrate the potential of Fresnel zone plates (FZPs) to achieve resolution that would unloc...
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Published in: | Applied optics (2004) 2020-11, Vol.59 (34) |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | The study of Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM)
instabilities in a planar geometry at high energy densities at the
National Ignition Facility (NIF) requires high spatial resolution
imaging. We demonstrate the potential of Fresnel zone plates (FZPs) to
achieve resolution that would unlock such studies. FZPs are circular
aperiodic gratings that use diffraction to focus x rays and produce an
image with high spatial resolution. Taking into account the NIF’s
challenging environment, we have designed a specific array of five
FZPs for a zinc backlighter to take a radiograph of a target with
9 keV x rays. We measured a mean resolution for the FZP of
1.9
µ
m
±
0.5
µ
m
and a
±
1
m
m
depth of focus at an x-ray
calibration facility as well as a
2.3
µ
m
±
0.4
µ
m
resolution on a resolution wire mesh
shot on the NIF. We also performed an in-depth analysis of the image
quality to assess the capability to resolve the small features present
in RT and RM instabilities. |
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ISSN: | 1559-128X 2155-3165 |