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Angle‐dispersive time‐of‐flight diffraction in a pulsed beam: an efficient technology to exploit the thermal‐neutron spectrum – design of a JULIOS diffractometer and experimental tests
Author(s) -
Schäfer W.,
Jansen E.,
Will G.
Publication year - 1993
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889893003267
Subject(s) - spallation , beam (structure) , scintillator , optics , neutron , neutron detection , neutron diffraction , time of flight , diffractometer , spallation neutron source , neutron source , materials science , neutron temperature , neutron radiation , diffraction , nuclear physics , physics , detector , scanning electron microscope
The time‐ and position‐resolving scintillation detector JULIOS was used for diffraction experiments in a pulsed neutron beam at the ISIS spallation source at the Rutherford Appleton Laboratory. Angle‐dispersive time‐of‐flight measurements with samples positioned in the primary white beam were performed on standard materials and on zinc‐containing spinel oxides; cation distributions of these compounds were determined by least‐squares intensity refinements. The experimental setup was used for a comparison of results obtained using white‐beam diffractometry at a pulsed spallation source and results obtained using conventional diffractometry with monochromatic neutrons at a continuous reactor beam. A gain by a factor of about 50 in intensity in favour of the white‐beam technology was obtained when results were extrapolated for an equal time‐averaged mean neutron flux. A JULIOS‐type diffractometer was designed to take full advantage of the time structure of the ISIS frame.