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

被引:34
作者
Cao, Huibo [1 ]
Chakoumakos, Bryan C. [1 ]
Andrews, Katie M. [1 ]
Wu, Yan [1 ]
Riedel, Richard A. [2 ]
Hodges, Jason [2 ]
Zhou, Wenduo [1 ]
Gregory, Ray [2 ]
Haberl, Bianca [1 ]
Molaison, Jamie [1 ]
Lynn, Gary W. [1 ]
机构
[1] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA
[2] Oak Ridge Natl Lab, Neutron Technol Div, Oak Ridge, TN 37831 USA
关键词
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;
D O I
10.3390/cryst9010005
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
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.
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