These figures show the measured neutron intensity (neutrons per second) with all choppers running at 20000 rpm, as a function of neutron wavelength and resolution mode. The sharp dips in the beam intensity at 3.35 Å and 6.70 Å are respectively due to (004) and (002) Bragg reflections in the pyrolytic graphite filter.
The lines show the calculated full width at half maximum (FWHM) energy resolution for elastic scattering at a chopper speed of 20000 rpm. The points are measured values of the resolution. The lines represent power law fits to the measurements.
This figure shows the upper and lower limits, as well as some intermediate values for the elastic scattering vector as a function of wavelength.