Event-based processing of neutron scattering data at the Spallation Neutron Source
Abstract
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 Al2O3 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.
Additional Information
© 2018 International Union of Crystallography. Received 13 October 2017. Accepted 22 March 2018. Edited by M. Arai, European Spallation Source, Lund, Sweden. This article will form part of a virtual special issue on advanced neutron scattering instrumentation, marking the 50th anniversary of the journal. We are grateful to Matt Rucker, Bekki Mills and Lou Santodonato for technical support with sample environments in the experiments described here. For the pulsed-magnet experiment, we have benefited from a long-term collaboration with the group of H. Nojiri at Tohoku University, Japan. The authors thank Dr Mike Crawford (Dupont) and Dr Emil Bozin (Brookhaven National Laboratory) for permission to use their octasilane-POSS and magnetite samples, respectively, during development of the dynamic ramping methodology. The accelerator team including John Galambos were helpful with the fixed-frequency accelerator study. Funding information: HLS acknowledges support from the US Department of Energy, Office of Basic Energy Sciences, under contract No. DE-FG02-03ER46055. Early demonstrations of the ADCROC DAQ and asynchronous measurements on VULCAN, and the development of the pulsed-magnet environment into a user capability, were supported by separate Laboratory Directed Research Development projects at Oak Ridge National Laboratory. Neutron scattering measurements are sponsored by the User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. This manuscript has been authored by UT-Battelle, LLC, under contract No. DE-AC05-00OR22725 with the US Department of Energy.Attached Files
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Additional details
- Eprint ID
- 87263
- Resolver ID
- CaltechAUTHORS:20180620-120646406
- DE-FG02-03ER46055
- Department of Energy (DOE)
- Oak Ridge National Laboratory
- DE-AC05-00OR22725
- Department of Energy (DOE)
- Created
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2018-06-20Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field