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![[Figure 2]](ge5109fig2mag.jpg)
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Figure 2
Wavelength spectra measured by neutron TOF with the filter only (blue), supermirror deflector (black), NVS (red) or HOPG (green) inserted into the beam after the Be + Bi filter. Dips in the spectra are caused by Bragg diffraction from materials in the beam, such as the Be and Bi filter and Mg and Al windows. The deflector reflects neutrons having wavelengths longer than 8 Å out of the beam. To convert to flux at the sample, multiply by the source solid angle ΩS and the FWHM of the wavelength distribution Δλ for a given instrument configuration. For example, for the NVS case with all guides in (NG = 9), λ = 5.36 Å and Δλ/λ = 0.125, the wavelength band width Δλ = 0.67 Å, the source solid angle is ΩS = (π/4)×(6 cm/558 cm)2 = 9.08 × 10−5 sr and the flux at the sample is 1.5 × 107 cm−2 s−1. |
![[Figure 2]](ge5109fig2.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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