Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

NGB 30m SANS - Small Angle Neutron Scattering

Perspective view of NG7 SANS instrument at NCNR

The 30 meter SANS instrument is installed on a split neutron guide NG-B. Designed to cover a wide Q-range, from 0.01 nm-1 using focusing refractive lenses to nearly 8.5 nm-1 at the lowest neutron wavelengths, it is suitable for examining structural features in materials ranging from roughly 1 to 700 nm. At least 75% of the instrument time will be allocated to guest researchers by the Beam Time Allocation Committee (BTAC).



0.01 nm-1 to 8.5 nm-1
Size Regime ~1 nm to ~700 nm
Source Neutron Guide (NG-B), cross-section: 60 mm x 60 mm
Monochromator Mechanical velocity selector with variable speed and pitch
Wavelength Range 3.0 Å to 20.0 Å
Wavelength Resolution 10% to 30% Δλ/λ (FWHM)
Source-to-Sample Distance 4 m to 16 m in 1.5m steps via insertion of guide sections
Collimation Circular pinhole collimation or focusing biconcave lenses
Sample Size 0 mm to 25 mm diameter
Sample-to-Detector Distance 1.3 m to 13.1 m continuously variable

640 mm x 640 mm 3He position-sensitive proportional counter with a 5.08 mm x 5.08 mm resolution

Optional Capabilities Focusing biconcave lenses
Power Outlets

220V, 30A, 1-phase - Qty. 2

208V, 30A, 3-phase - Qty. 2

208V, 60A, 3-phase - Qty. 2

110V, 30A, 1-phase - Numerous UPS and non-UPS


Scientific Opportunities/Applications

How NGB 30m SANS Beam Time is Typically Allocated in Each 38 Day Cycle:

  • 28 days minimum - BTAC Proposals
  • Balance (10 days or less) - Proprietary and Collaborative Research
Created October 1, 2018, Updated October 12, 2023