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SAM
CRG - Small-angle neutron scattering instrument
Characteristics
| Guide hall n°1, cold guide H151 |
| Monochromator | |
|---|---|
| Velocity selector (ASTRIUM,) | Δλ/λ ≈ 10 % (FWHM) (at zero rotation angle) |
| Incident wavelength | Variable, 3.2 ≤ λ [Å] ≤ 25 |
| Beam monitor (LND, Inc.) | Thin235U monitor with 10-6relative efficiency (count rate ≈ 10 kHz at λ = 6 Å) |
| Polarization | |
|---|---|
| m = 4 polarizing double-V cavity (SwissNeutronics) | Cross section (height × width) : 30 × 30 mm\(^{-2}\) over 1.37 m |
| Flipping ratio at sample position | > 100 at λ = 4-8 Å (max. 150 at λ = 6 Å) over a beam with 20 mm diameter |
| Collimation | |
|---|---|
| Beam attenuators | A set of 4 sintered10B4C + Gd sieves (with identical hole density but different hole diameters), effective attenuation factors ≈ 1970, 550, 120 and 30 |
| 3 xm = 1non-polarizing guides (SwissNeutronics) | Cross section (height × width) : 30 × 30 mm\(^{-2}\) over 6.5 m |
| Collimator nose | 2 ... 2.5 m (continuously adjustable to accomodate various sample environments) |
| Guide-to-sample distances | 2.5, 5, 7 and 9 m (+/- 0.15 m) |
| Sample area | |
|---|---|
| Sample aperture | User-defined, typically up to Ø = 20 mm |
| Flux at specimen at reactor power = 54.8 MW & lowest resolution | 6.1 x 10\(^{7}\)n.cm\(^{-2}\).s\(^{-1}\)(at λ = 5 Å) |
| Brightness at specimen at reactor power = 54.8 MW & lowest resolution | 4.2 x 10\(^{11}\)n.cm\(^{-2}\).s\(^{-1}\).srad\(^{-1}\)(at λ = 5 Å) |
| Typical sample size | 5-15 mm Ø |
| Sample table | x, y, z translations, 2 independent goniometers and rotations |
| Ancillary sample environments | Thermally regulated sample changer (15 positions), 5 < T < 80 °C10 T horizontal cryomagnet (Oxford Instruments), 1.5 < T < 300 K1.5 T electromagnet (GMW Associates), T = 300 K |
| Detector | |
|---|---|
| Detector type | Single panel monoblock \(^{3}\)He position-sensitive detector (ILL) |
| Area, pixel size | 640 x 640 mm\(^{2}\), 2.5 x 5 (H x V) mm\(^{2}\) |
| Background | ≈ 1.8 Hz on whole detector (electronic noise, reactor off), ≈ 12.5 Hz reactor on |
| Sample-to-detector distance | 0.75 ... 6.7 m (continuously adjustable) |
| Momentum transfer range | 5·10\(^{-3}\)≤ Q [Å-1] ≤ 0.6 (at λ = 6 Å)Down to 2·10\(^{-3}\) Å-1 at λ = 15 Å Up to 1.05 Å-1at λ = 3.2 Å |