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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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Setup for polarized neutron imaging using in situ ³He cells at the Oak Ridge National Laboratory High Flux Isotope

I Dhiman¹, Ralf Ziesche², Tianhao Wang¹

¹Neutron Science Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments

|October 2, 2017

Abstract:

In the present study, we report a new setup for polarized neutron imaging at the ORNL High Flux Isotope Reactor CG-1D beamline using an in situ ³He polarizer and analyzer. This development is very important for extending the capabilities of the imaging instrument at ORNL providing a polarized beam with a large field-of-view, which can be further used in combination with optical devices like Wolter optics, focusing guides, or other lenses for the development of microscope arrangement. Such a setup can be of advantage for the existing and future imaging beamlines at the pulsed neutron sources. The first proof-of-concept experiment is performed to study the ferromagnetic phase transition in the Fe₃Pt sample. We also demonstrate that the polychromatic neutron beam in combination with in situ ³He cells can be used as the initial step for the rapid measurement and qualitative analysis of radiographs.

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