Source |
m = 1 straight neutron guide 60 × 150 mm cross section, filter: 200 mm Be + 200 mm Bi |
Monochromator |
(i) HOPG, Δλ/λ = 0.8–1.0%, 4.75 < λ < 5.5 Å |
(ii) Neutron velocity selector (NVS), Δλ/λ = 12.5%, 4.5 < λ < 20.0 Å |
(iii) Deflector, Δλ/λ = 44%, λ = 5.34 Å |
(iv) Filter only, Δλ/λ = 80%, λ = 6.20 Å |
Source–sample distance |
Nominally 6–24 m in 2 m steps via insertion of neutron guide segments |
Sample–detector distance |
(i) Rear: 11.03–23.65 m |
(ii) Middle: 2.85–20.87 m |
(iii) Front: 0.84–10.14 m |
Collimation |
(i) Standard circular pinhole |
(ii) 18 CB with MgF2 lenses and prisms |
(iii) Slits; width 1–60 mm, height 1–150 mm |
Sample area |
2 m-long sample area with four-axis stage and vacuum pipe |
q range |
2 × 10−4 to 0.7 Å−1
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Detectors |
(i) Rear: 6LiF ZnS(Ag) scintillator with CCD, 0.85 mm resolution (FWHM), 0.21 m wide × 0.47 m tall |
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(ii) Middle: 8 mm-diameter 3He tubes, 48 tube panels; four panels: left + right are 0.40 m wide × 1.00 m tall, top + bottom are 0.50 m wide × 0.40 m tall |
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(iii) Front: same as middle (see above) |
Polarization |
(i) Double-V polarizer having 99% polarization |
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(ii) RF spin flipper having > 99.99% flipping efficiency |
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(iii) 3He spin analyzer |