The HB-2D Polarized Neutron Development Beamline at the High Flux Isotope Reactor

6th European Conference on Neutron Scattering

Crow, Lowell^1 ; Hamilton, W.A.^1 ; Zhao, J.K.^1 ; Robertson, J.L.^1

Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge

TN

37831, United States^1

关键词: Development and testing;    Diffraction measurements;    Focusing technique;    High flux isotope reactors;    Instrument performance;    Oak ridge National Laboratory;    Polarization techniques;    Spallation neutron sources;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012010/pdf
DOI  :  10.1088/1742-6596/746/1/012010

来源: IOP

【 摘 要 】

The Polarized Neutron Development beamline, recently commissioned at the HB-2D position on the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, provides a tool for development and testing of polarizers, polarized neutron devices, and prototyping of polarized neutron techniques. With available monochromators including pyrolytic graphite and polarizing enriched Fe-57 (Si), the instrument has operated at 4.25 and 2.6 Å wavelengths, using crystal, supermirror, or He-3 polarizers and analyzers in various configurations. The Neutron Optics and Development Team has used the beamline for testing of He-3 polarizers for use at other HFIR and Spallation Neutron Source (SNS) instruments, as well as a variety of flipper devices. Recently, we have acquired new supermirror polarizers which have improved the instrument performance. The team and collaborators also have continuing demonstration experiments of spin-echo focusing techniques, and plans to conduct polarized diffraction measurements. The beamline is also used to support a growing use of polarization techniques at present and future instruments at SNS and HFIR.