Characteristics
| Guide hall n°1, cold guide H142 |
|---|
| Wavelength Definition | |
|---|---|
| Monochromatic Mode: | |
| Velocity selector (Astrium) | Δλ/λ = 10 % (standard) |
| Wavelength range | 4.5 < λ/Å < 40 (for Δλ/λ = 10 %) |
| Time-of-Flight (TOF) Mode: | |
| 4-chopper system (Astrium) | |
| Wavelength cut-offs | 14 Å and 20 Å |
| Wavelength resolutions | Δλ/λ = 2 % to 26 % (depending on chopper pair & detector distance) |
| Collimation | |
|---|---|
| 4 movable guide sections | 2.5 m |
| Beam nose | 2.8 m |
| Guide cross-section | 30 x 30 mm |
| Source-to-sample distances (m) | 2.8, 5.3, 7.8, 10.3, 12.8 |
| Source apertures | 30x50 mm (off-centre), 30x30 mmdiameters: 5, 10, 20, 30 mm |
| Sample area | |
|---|---|
| Maximum flux at sample(for Δλ/λ = 10%) | 4.1x10\(^{7}\)n cm-2s\(^{-1}\) |
| Brightness (flux / unit solid angle) | 3.5\(^{7}\)x10\(^{11}\)n cm\(^{-2}\)s-1strd\(^{-1}\) |
| Maximum sample dimensions | 15 mm x 15 mm |
| Sample environments | Sample changer, Electromagnet, Cryostat, Cryomagnet, Furnace, Stopped-flow, Shear cell |
| Detectors | |
|---|---|
| Sample - Detector distances | 1.2 ... 12.8 m |
| Detector 1 (rear): | |
| Single panel monoblock | 640 x 640 mm |
| Pixel size | 5 x 5 mm\(^{2}\)(128 x 128 pixels) |
| Maximum count rate | 4 MHz (global) ; 3 kHz/pixel (local) |
| Detector 2 (front): | |
| 4-panel monoblock | 160 x 640 mm each panel |
| Pixel size | 5 x 5 mm\(^{2}\)(32 x 128 pixels) |
| Maximum count rate | 4 MHz (global) ; 3 kHz/pixel (local) |
Instrument Description
Scientific goals
Modern trends in materials science, physics and in particular nano-structured materials require that D33 provides both high resolution and a wide dynamic range of measured scattering vector, q.
Description
The instrument offers both ‘monochromatic’ and ‘time-of-flight’ (TOF) mode.
Monochromatic mode: a velocity selector and flexible system of inter-collimation apertures defines the neutron beam.
TOF mode: a chopper system allows an enhanced dynamic q-range (qmax / qmin) and flexible wavelength resolution.
Two large multitube detectors extend the dynamic q-range further giving qmax / qmin = 20 in monochromatic mode and massive qmax / qmin > 1000 in TOF mode.
Beam polarization and 3He spin analysis facilitate and expand studies of magnetism and allow a more quantitative analysis of spin incoherent samples. The position of D33 allows high magnetic fields and bulky environments at the sample position.
Ref.:
- "The small-angle neutron scattering instrument D33 at the Institut Laue–Langevin", Dewhurst C.D., Grillo I., Honecker D., Bonnaud M., Jacques M., Amrouni C., Perillo-Marcone A., Manzin G., Cubitt R., Journal of Applied Crystallography 49, 1-14 (2016)