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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Focusing High-Resolution Three Axis Neutron Diffractometer for Microstructure Investigations of Polycrystalline Materials

Mar 21, 2023, 4:00 PM
2h
Yards 4 - 6 (Fakultät für Maschinenwesen)

Yards 4 - 6

Fakultät für Maschinenwesen

Board: TU-276
Poster Neutron Instrumentation, Optics, Sample Environment, Detectors, and Software Poster session TUESDAY

Speaker

Dr Pavol Mikula (Nuclear Physics Institute ASCR, 250 68 Řež, Czech Republic)

Description

Presented three-axis neutron diffractometer setting documents the feasibility of using it in special cases high-resolution powder diffraction studies, namely, for thermomechanical (elastic and/or) plastic deformation studies of bulk polycrystalline samples when the whole powder diffraction spectrum is not required. Contrary to the conventional double-axis setting the suggested alternative providing a much higher resolution, consists of an unconventional three axis set-up employing a bent perfect crystal monochromator and analyzer with a polycrystalline sample in between. The analysis of the profile of the beam diffracted by a sample is carried out by rocking the BPC-analyser and the neutron signal is registered by a point detector. Then, the so-called analyzer rocking curve providing a sample diffraction profile can reflect the lattice or structural changes. Moreover, much larger widths (up to 10 mm) of the irradiated gauge volumes can be investigated when just slightly affecting the resolution of the experimental setting. Finally, a feasibility of the proposal of the three-axis alternative employing PSD for strain/stress studies which could substantially decrease a long measurement time when using the step-by-step rocking curve scanning will be documented.

Primary author

Dr Pavol Mikula (Nuclear Physics Institute ASCR, 250 68 Řež, Czech Republic)

Co-author

Dr Vasyl Ryukhtin (Nuclear Physics Institute ASCR,)

Presentation materials

There are no materials yet.

Peer reviewing

Paper