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X-ray Imaging01:24

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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Self characterization of a coded aperture array for neutron source imaging.

P L Volegov1, C R Danly1, D N Fittinghoff2

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.

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Summary
This summary is machine-generated.

A new method precisely locates apertures in the National Ignition Facility's neutron imaging system. This ensures accurate measurements of neutron sources from inertial confinement fusion experiments.

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Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • Diagnostic Instrumentation

Background:

  • The National Ignition Facility (NIF) uses a neutron imaging system to diagnose deuterium-tritium (DT) plasma during inertial confinement fusion (ICF) implosions.
  • Accurate measurement of neutron source size and shape is critical for understanding ICF performance.
  • Existing imaging systems face challenges due to the small neutron source size and deep penetration of neutrons.

Purpose of the Study:

  • To develop and present a novel technique for precisely measuring and characterizing the location of each aperture in the NIF neutron imaging system.
  • To improve the accuracy of neutron source reconstruction from ICF experiments.

Main Methods:

  • Development of a new measurement technique for aperture characterization.
  • Detailed algorithms for precise aperture location determination.
  • Application of the technique to an array of 20 pinhole and 3 penumbral imaging apertures.

Main Results:

  • Successful implementation of a new technique for measuring aperture locations.
  • Demonstration of accurate characterization of aperture positions within the imaging system.
  • Improved accuracy in reconstructing neutron source characteristics from experimental data.

Conclusions:

  • The presented technique is essential for accurate neutron imaging at NIF.
  • Precise aperture localization is key to reliable diagnostics of ICF implosions.
  • This advancement contributes to a better understanding of fusion plasma dynamics.