Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

CHRNS VSANS - Very Small-Angle Neutron Scattering

 

Logo for Center for High Resolution Neutron Scattering

 

VSANS Schematic

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
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%
Source-to-Sample
Distance
4 m to 22 m in 2 m steps
Collimation 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 tall

 

VSANS flux range as compared to the 30m instruments
VSANS Q range as compared to existing 30 m SANS and USANS instruments.

 

 

Created October 1, 2018, Updated January 7, 2020