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The new detector is a custom-built array of 20 high pressure (10 bar 3He) tube detectors (25.4 mm diameter) with an effective area of 25 cm (w) x 38 cm (h). Spatially resolved measurements with multiple diffraction peaks will be optimized through apertures with curved slots (conical slits) specific for a given combination of material and wavelength. A conventional single opening aperture is available as well.

detector instrument side view
3He tube detector array. In order to avoid gaps, every other tube is recessed and overlapped in area with the front tube. Credit: T.Gnaupel-Herold

The improved detector resolution (2.8 mm) combined with the higher pressure of the detection gas leads to a strain resolution gain factor of 2.2 compared with the old detector. Individual data on each of the 20 tubes are available but the default analysis mode is pair-wise summation, thus setting the vertical resolution to 3.8 cm. The vertical angular range is »30°, depending on the distance to the sample.

sample of new detector instrument data
Austenite (111) and ferrite (110) peaks measured using the tube array (new detector), compared to the previously used, now deprecated Ordela 1150N detector.  Credit: T.Gnaupel-Herold



Created February 15, 2023