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CHRNS VSANS - Very Small-Angle Neutron Scattering
Sponsored by the National Science Foundation as part of the Center for High Resolution Neutron Scattering (CHRNS), this brand new 45 meter long Small-Angle Neutron Scattering (VSANS) instrument on neutron guide NG3 was put into operation in 2017.
The instrument has a number of design features to make it more versatile than the 30 m instruments:
- High Resolution detector
- Converging beam collimation
- Multiple detector arrays
- Narrow or broad wavelength resolution
For more information see Design Features
Specifications/Capabilities
| Q-range | 0.002 nm-1 to 10 nm-1 | ||
| Size Regime | 1 nm to 2,000 nm | ||
| Source | Neutron Guide (NG-3), cross-section: 60 mm x 150 mm | ||
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Power Outlets |
220V, 30A, 1-phase - Qty. 3 208V, 30A, 3-phase - Qty. 2 208V, 60A, 3-phase - Qty. 2 110V, 30A, 1-phase - Numerous UPS and non-UPS |
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Monochromator
| Velocity selector | Mirror | HOPG | |
| Wavelength Range | 4.5 Å to 12 Å | 5.3 Å | 4 Å to 6 Å |
| Wavelength Resolution (fwhm) |
12 % | ~ 40% | 1% |
Collimation
| Source-to-Sample Distance |
4 m to 22 m in 2 m steps | ||
| Collimation Types | Circular Pinhole, Multiple converging beams or Narrow slits | ||
| Sample Size | 5 mm diameter to 36 mm x 72 mm | ||
| Sample-to-Detector Distance | Front | Middle | Rear Carriage |
| 0.6 m to 10 m | 2.5 m to 18 m | 10 m to 22 m | |
Detectors
| Front | Middle | Rear Carriage | |
| Type | He(3) tubes | He(3) tubes | Scintillator + CCD |
| Resolution | 8 mm | 8 mm | 0.2 mm |
| #Panels | 4 | 4 | 1 |
| Size | 2 x 380 mm wide x 1000 mm tall 2 x 500 mm wide x 380 mm tall |
220 mm wide 500 mm ta |
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