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The figure on the left shows 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 graphite filter is used to eliminate high energy neutrons (for a detailed explanation, please look at the reference The optical filter of the disk chopper spectrometer at NIST JRD Copley and JC Cook (2000) Physica B 283 386-388). Click here to get an interactive graphical interface |
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A detail of the short wavelength region is shown. |
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The lines show the calculated 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.
Click here to get an interactive graphical interface |
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The figure on the left shows the upper and lower limits, as well as some intermediate values for the
elastic scattering vector as a function of wavelength.
Click here to get an interactive graphical interface |