CHRNS USANS - Ultra Small Angle Neutron Scattering     CHRNS-logo


USANS Schematic

A perfect crystal diffractometer (PCD) for ultra-high resolution small-angle neutron scattering (USANS) measurements has been in operation at the thermal neutron beam port, BT-5 since 2002. The PCD increases the maximum size of features accessible with the NCNR's 30-m long, pinhole collimation SANS instruments by nearly two orders of magnitude, from ~102 nm to 104 nm.

Specifications / Capabilities:

Q-range 0.0003 nm-1 to ~0.1 nm-1
Size Regime 0.1 μm to 20 μm
Source Beam Tube (BT-5)
Monochromator Pyrolytic Graphite Premonochromator Followed by a Triple-Bounce Si(220) Monochromator
Wavelength 2.4 Å and 6% Δλ/λ
Flux at Sample <17,000 neutrons-cm-2-s-1
Sample Size Up to 5 cm high x 5 cm wide x 10 mm thick
Analyzer Triple-Bounce Si(220)

Access Information:

USANS Beam Schematic

Name: Markus Bleuel
Phone: (301) 975-5165
100 Bureau Dr Stop 6102
Gaithersburg, MD 20899-6102

Name: David Mildner - Scheduling
Phone: (301) 975-6366

Name: Paul Butler
Phone: (301) 975-2028