The use of time-of-flight neutron Bragg edge imaging to measure the residual strains in W/Cu dissimilar joints for fusion reactors

Neutron Diffraction Measurements of Residual Stresses for Ferritic Steel Specimens over 80 mm Thick

“…Note that the sandwich structure can be bent more without destroying the crystal. It has a specific design compared to recent neutron diffractometers [18][19][20].…”

“…It has been known that the error of the diffraction peak position is proportional to the peak width (full width at half maximum, FWHM) and the square root of the peak height (H) [1,9]. Since the peak width and height vary as a function of the curvature of the monochromator, it is necessary to perform the diffraction experiments to determine the optimized curvature [9,18]. Figure 4 shows the dependence of the H and FWHM of the (112) and (220) diffraction peaks from a ferritic steel as a function of the curvature radius (R, m) by bending the Si220 monochromator.…”