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Related Experiment Video

Updated: Jun 14, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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Alignment effects on a neutron imaging system using coded apertures.

Isabelle Thfoin1, Olivier Landoas, Tony Caillaud

  • 1CEA, DAM, DIF, F-91297 Arpajon, France.

The Review of Scientific Instruments
|April 8, 2010
PubMed
Summary

A new neutron imaging system for fusion experiments was tested. Penumbral imaging is less sensitive to misalignment than annular aperture imaging, crucial for megajoule-class lasers.

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Related Experiment Videos

Last Updated: Jun 14, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
10:24

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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

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06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Area of Science:

  • Nuclear Fusion Science
  • High-Resolution Imaging
  • Diagnostic Development

Background:

  • Inertial confinement fusion (ICF) experiments require high-resolution diagnostics to monitor plasma conditions.
  • Neutron imaging is a key technique for ICF diagnostics, providing insights into fuel compression and burn.
  • Existing imaging techniques can be sensitive to experimental misalignments, affecting data quality.

Purpose of the Study:

  • To develop and test a high-resolution neutron imaging system for ICF experiments.
  • To evaluate the sensitivity of penumbral and annular aperture imaging techniques to misalignment.
  • To assess the suitability of these techniques for megajoule-class laser facilities like OMEGA.

Main Methods:

  • Development and testing of a coded imaging system using penumbral and annular apertures.
  • Experimental validation on the OMEGA laser facility during ICF shots.
  • Simulations using the Monte Carlo code GEANT4 to compare with experimental results.

Main Results:

  • Experimental and simulation results show good agreement.
  • Both penumbral and annular imaging techniques are sensitive to source position and misalignment.
  • Penumbral imaging demonstrates significantly lower sensitivity to misalignment compared to annular imaging.

Conclusions:

  • Neutron imaging diagnostics are essential for ICF research.
  • Penumbral imaging offers improved robustness against misalignment for ICF applications.
  • Future neutron imaging system development must consider alignment capabilities on large laser facilities.