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Thermal deflection causes sample misalignment in neutron experiments. Neutron imaging and machine vision quantified sample motion, revealing displacements up to 2 mm, crucial for future focused neutron beams.

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Area of Science:

  • Materials Science
  • Neutron Scattering
  • Experimental Physics

Background:

  • Oak Ridge National Laboratory neutron sources utilize diverse sample environment equipment for extreme condition experiments.
  • Instrumentation often involves temperature extremes (cryostats, furnaces), leading to thermal deflection.
  • Sample movement due to thermal effects can impact experimental alignment and data accuracy.

Purpose of the Study:

  • To quantify sample displacement caused by thermal deflection under various experimental conditions.
  • To assess the impact of this displacement on sample alignment within the neutron beam.
  • To inform strategies for mitigating misalignment in current and future neutron instrumentation.

Main Methods:

  • Integration of neutron imaging and machine vision techniques.
  • Utilizing representative sample environments simulating extreme temperatures.
  • Measuring sample position relative to the neutron beam during thermal cycling.

Main Results:

  • Observed vertical sample displacement of 1-2 mm.
  • Measured horizontal displacement ranging from negligible to 1.2 mm.
  • Identified thermal deflection as a significant factor affecting sample alignment.

Conclusions:

  • Thermal deflection-induced sample motion is a critical consideration for advanced neutron instrumentation, especially with focused beams.
  • Mitigation protocols and environmental modifications are necessary to minimize misalignment.
  • Accurate sample positioning is essential for sub-millimeter targets and future neutron source developments.