Neutron Sciences Directorate

Polarized Neutron Development Beamline HB-2D

The Polarized Neutron Development beamline, at the HB-2D position in the HFIR Beam Room, provides a tool for development and testing of polarizers, polarized neutron devices, and prototyping of polarized neutron techniques. Currently a pyrolytic graphite monochromator with a beryllium filter produces a 4.25 Å wavelength, using supermirror or He-3 polarizers and analyzers in various configurations. The Neutron Optics and Polarization Group in the Neutron Technologies Division operates 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. 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 growing use of polarization techniques at present and future instruments at SNS and HFIR.

Contacts: Lowell Crow, Fankang Li, Peter Jiang, Doug Kyle

Neutron Detector Test Station CG-1A

The Neutron Detector Test Station, at the CG-1A position in the HFIR Guide Hall, is a resource for testing of new neutron detection concepts, characterization of detector prototypes, and field calibration of operational detectors. A pyrolytic graphite monochromator provides a 4.22 Å, with a beryllium filter to eliminate higher order wavelengths. The Detectors Group in the Neutron Technologies Division operates the beamline. Recent efforts include calibration of Anger cameras for diffraction beamlines, testing of the new dome Anger camera prototype assembly, characterization of new scintillators, and preparation of TimePix-based microchannel plate detectors for neutron imaging.

Contacts: Matthew Loyd, Lowell Crow, Doug Kyle

Alignment Diffractometer CG-1B

The Alignment Diffractometer, at the CG-1B position in the HFIR Guide Hall, provides sample alignment and component testing capability. A pyrolytic graphite monochromator produces a 2.417 Å (14 meV) beam. The sample is normally mounted on a goniometer with motorized 2-axis tilt and translation, and a single 3He detector with variable scattering angle is used to observe Bragg peaks. The instrument frequently serves users of the HFIR Triple-Axis and the SNS Chopper Spectrometers for pre-alignment before sample environment mounting.

Contacts: User alignments are scheduled on CG-1B by selecting the sample alignment requirement within the Integrated Proposal Tracking System (IPTS)

Cold Neutron Polarization Development Beamline CG-4B

The Cold Neutron Polarization Development Beamline (CNPDB) is dedicated to the development of cold neutron polarization techniques, including Larmor techniques such as MICE, MIEZE, SESANS, and SERGIS. The beamline is located at the CG4B location in the HFIR Cold Guide Hall, in building 7970. The silicon monochromator, mounted inside the guide tunnel, occupies the CG4B guide gap. The monochromator takeoff angle is fixed at 122 degrees, for a wavelength of 5.5 Å. The shutter is located on the inside of the stainless steel shield wall section which provides the exit port, shutter support, and support for a polarizing element. The beamstop, located about 7 m from the monochromator, defines the end of the instrument. Aluminum fencing encloses the beam area, with a gate on each side of the beamline. A goniometer has been added recently. The Neutron Optics and Polarization Group in the Neutron Technologies Division operates the beamline, and has polarizers, spin manipulation devices, and detectors to support ongoing research.

Contacts: Lowell Crow, Peter Jiang, Fankang Li, Doug Kyle