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Frame overlap Bragg edge imaging.

Matteo Busi1, Jan Čapek1, Efthymios Polatidis1

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Summary
This summary is machine-generated.

This study introduces a novel pulse overlap transmission imaging technique for continuous neutron sources. This method significantly enhances the flux for high-wavelength-resolution neutron Bragg edge imaging, improving crystalline feature analysis.

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Area of Science:

  • Materials Science
  • Neutron Imaging
  • Crystallography

Background:

  • Neutron Bragg edge imaging analyzes crystalline features using transmission spectra.
  • High spectral resolution and large wavelength ranges are crucial for applications like strain mapping.
  • These studies are typically limited to pulsed neutron sources due to efficiency constraints at continuous sources.

Purpose of the Study:

  • To develop a technique for increasing the flux in time-of-flight neutron Bragg edge imaging at continuous neutron sources.
  • To enable high wavelength resolution measurements at continuous sources without sacrificing significant neutron flux.

Main Methods:

  • Introduction of a pulse overlap transmission imaging technique.
  • Utilizing a chopper with a specific random slit distribution.
  • Applying the correlation theorem for signal processing to disentangle overlapping pulses.

Main Results:

  • Demonstrated a significant increase in available flux (approximately one order of magnitude) for high wavelength resolution time-of-flight neutron Bragg edge imaging.
  • Successfully reconstructed Bragg edge patterns from overlapping spectra.
  • Proof-of-principle measurements confirmed the feasibility of the technique.

Conclusions:

  • The pulse overlap transmission imaging technique effectively increases neutron flux at continuous sources.
  • This advancement makes high-resolution neutron Bragg edge imaging more accessible at continuous neutron facilities.
  • The method holds promise for improved spatially resolved studies of crystalline materials.