TOPAZ—Specifications

Moderator Decoupled poisoned hydrogen
Source to sample distance 18 m
Sample to detector distance, evacuated 39 – 45 cm
Initial angular detector coverage 1.7 sr, 14 detectors
Optional angular detector coverage > 2.9 sr
Detector pixel size ~1.0 mm
Detector angles 20–160º 2θ; +/- 32° out-of-plane
Wavelength bandwidth 3.0 Å
Frame 1 0.5 – 3.5 Å
Frame 2 4.0–7.0 Å
Resolution 0.4%
Sample size 1–10 mm3 (<3 mm on a side)
d spacing range 0.25 < 12.5 < 25.0 Å (Fame 1, 2)
Neutron beam divergence on sample 15 mrad < d < 25 mrad
Sample Environment Ambient 2-circle goniometer:
χ = 135°, ω: 0° – 360°, Φ: 0° – 360°
Nitrogen cold flow 100–400 K