The article discusses the performance of the high-flux backscattering spectrometer (HFBS) at the NIST Center for Neutron Research. The HFBS uses advanced neutron optics devices to achieve high neutron flux on the sample while maintaining excellent energy resolution.
Key performance metrics include:
– Vanadium resolution with a FWHM of 0.93 µeV
– Neutron fluence rate of 3 x 10⁵ n cm⁻²s⁻¹ at the beam center
– Energy transfers up to ±50 µeV using a high-speed Doppler-driven monochromator
– Instrumental energy resolution with a Gaussian-like lineshape
The article also presents performance data for the monitor detector, showing a skewed energy distribution skewed to energies greater than Eo. Finally, it includes a measurement of the methyl tunnel splitting in 2,6 lutidine demonstrating the instrument’s large dynamic range and excellent energy resolution of about 1.01 µeV FWHM.
The HFBS at NIST is designed to provide high-quality neutron scattering data for various scientific studies, particularly in the fields of condensed matter physics and materials science.
Source: https://www.nist.gov/ncnr/hfbs-instrument-performance
Keywords: neutron, energy, resolution, metrology, devices
