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Neutron scattering experiments at JPARC

Johan was in Japan at the Takumi beamline of the Japan Proton Accelerator Research Complex (JPARC), performing residual stress measurements using time-of-flight neutron diffraction. The experiment is a part of an ongoing project together with Lund University, ESS, and Sandvik focused on investigating if/how neutrons can help with the characterization of cemented carbides for use in the mining industry. Bulk studies of these materials are not possible with x-rays because they contain a lot of Tungsten which is very x-ray absorbing. The high penetration power of neutrons is therefore needed to access the interior of the samples. Shirin Nouhi from Sandvik also joined the experiment.

Figure 1: The samples mounted on the diffractometer. The neutrons come from the small opening in the middle of the image, and diffracted neutrons are measured by the detectors to the left and right.
Figure 2: Neutron measurements are generally slow, which gave us plenty of time to sample some Japanese food.
Figure 3: Rietveld refinement on one of the diffractograms, showing peaks from tungsten-carbide and FCC-cobalt.

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