Engineering diffraction with TAKUMI

Engineering diffraction is a diffraction method to measure elastic strains (stresses), grain sizes and/or dislocations, texture and other engineering parameters, from accurate measurements and analyzes of peak position, peak broadening, peak intensity, etc. Neutron diffraction is a powerful tool to obtain such information as that of an inside part or as an average of a whole part, since neutrons have high penetration abilities. A dedicated neutron diffractometer to carry out engineering diffraction, called 'TAKUMI' has been constructed at J-PARC and has been completed at the end of 2009 fiscal year. The commissioning to clarify the performances has almost finished and general uses have been started. TAKUMI was found to have not only a high resolution Δd/d of less than 0.2%, but also a wide d-spacing of 0.05nm < d < 0.47nm, and also applying an event data recording method that is very powerful for time-slicing observation. Many scientific and/or industrial results with high impacts herewith are anticipated to be achieved by using TAKUMI. (author)