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Crystals 2019, 9(1), 5; https://doi.org/10.3390/cryst9010005

DEMAND, a Dimensional Extreme Magnetic Neutron Diffractometer at the High Flux Isotope Reactor

1
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
2
Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
*
Author to whom correspondence should be addressed.
Received: 8 December 2018 / Revised: 19 December 2018 / Accepted: 19 December 2018 / Published: 21 December 2018
(This article belongs to the Special Issue Neutron Diffractometers for Single Crystals and Powders)
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Abstract

A two-dimensional (2D) Anger camera detector has been used at the HB-3A four-circle single-crystal neutron diffractometer at the High Flux Isotope Reactor (HFIR) since 2013. The 2D detector has enabled the capabilities of measuring sub-mm crystals and spin density maps, enhanced the efficiency of data collection and phase transition detection, and improved the signal-to-noise ratio. Recently, the HB-3A four-circle diffractometer has been undergoing a detector upgrade towards a much larger area, magnetic-field-insensitive, Anger camera detector. The instrument will become capable of doing single-crystal neutron diffraction under ultra-low temperatures (50 mK), magnetic fields (up to 8 T), electric fields (up to 11 kV/mm), and hydrostatic high pressures (up to 45 GPa). Furthermore, half-polarized neutron diffraction is also available to measure weak ferromagnetism and local site magnetic susceptibilities. With the new high-resolution 2D detector, the four-circle diffractometer has become more powerful for studying magnetic materials under extreme sample environment conditions; hence, it has been given a new name: DEMAND. View Full-Text
Keywords: single-crystal neutron diffraction; polarized neutron diffraction; position sensitive detector; magnetism; magnetic materials; atomic magnetic susceptibility; local magnetic susceptibility; ultra-low temperature; high pressure; Anger camera single-crystal neutron diffraction; polarized neutron diffraction; position sensitive detector; magnetism; magnetic materials; atomic magnetic susceptibility; local magnetic susceptibility; ultra-low temperature; high pressure; Anger camera
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Cao, H.; Chakoumakos, B.C.; Andrews, K.M.; Wu, Y.; Riedel, R.A.; Hodges, J.; Zhou, W.; Gregory, R.; Haberl, B.; Molaison, J.; Lynn, G.W. DEMAND, a Dimensional Extreme Magnetic Neutron Diffractometer at the High Flux Isotope Reactor. Crystals 2019, 9, 5.

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