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Event‐based processing of neutron scattering data at the Spallation Neutron Source
Author(s) -
Granroth Garrett E.,
An Ke,
Smith Hillary L.,
Whitfield Pamela,
Neuefeind Joerg C.,
Lee Jooseop,
Zhou Wenduo,
Sedov Vladislav N.,
Peterson Peter F.,
Parizzi Andre,
Skorpenske Harley,
Hartman Steven M.,
Huq Ashfia,
Abernathy Douglas L.
Publication year - 2018
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/s1600576718004727
Subject(s) - spallation neutron source , neutron source , oak ridge national laboratory , spallation , neutron scattering , diffractometer , neutron , spectrometer , nuclear physics , materials science , neutron diffraction , nuclear engineering , powder diffractometer , neutron detection , physics , optics , diffraction , engineering , scanning electron microscope
The Spallation Neutron Source at Oak Ridge National Laboratory, USA, ushered in a new era of neutron scattering experiments through the use of event‐based data. Tagging each neutron event allows pump–probe experiments, measurements with a parameter asynchronous to the source, measurements with continuously varying parameters and novel ways of testing instrument components. This contribution will focus on a few examples. A pulsed magnet has been used to study diffraction under extreme fields. Continuous ramping of temperature is becoming standard on the POWGEN diffractometer. Battery degradation and phase transformations under heat and stress are often studied on the VULCAN diffractometer. Supercooled Al 2 O 3 was studied on NOMAD. A study of a metallic glass through its glass transition was performed on the ARCS spectrometer, and the effect of source variation on chopper stability was studied for the SEQUOIA spectrometer. Besides a summary of these examples, an overview is provided of the hardware and software advances to enable these and many other event‐based measurements.