The article discusses the polarized beam capability of the new MACS (Multi-Axis Crystal Spectrometer) instrument at the NIST Center for Neutron Research. The instrument uses 3He spin filters to polarize and analyze the neutron beam, allowing for precise measurements of magnetic properties in materials.
Key components include:
– Polarizer: A 3He cell in a radio frequency-shielded solenoid to polarize the incident neutron beam
– Analyzers: Wide-angle 3He cells near the sample or a horseshoe-shaped cell surrounding the sample to analyze the scattered beam
– Magnetic field: A uniform 4 mT field provided by a vertical solenoid containing the cells and sample
– Spin flipping: Achieved by inverting the 3He polarization using the AFP NMR technique
The instrument provides a neutron flux of up to 5×10^8/s/cm^2 on an 8 cm^2 sample area, suitable for various applications in neutron scattering experiments.
Source: https://www.nist.gov/ncnr/spin-filters/spin-filter-instruments/chrns-macs
Keywords: Neutron, Spin, Polarization, Filter, Spectrometer
