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BT5 USANS - Ultra Small Angle Neutron Scattering


 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:

Obtaining Instrument Time

How BT5 USANS Beam Time is Typically Allocated in Each 38 Day Cycle:

  • 22 Days - BTAC Proposals
  • 16 Days - Proprietary and Collaborative Research
USANS Beam Schematic

Name: Markus Bleuel - Instrument Responsible
Phone: (301) 975-5165
Email: markus.bleuel@nist.gov
100 Bureau Dr Stop 6102
Gaithersburg, MD 20899-6102

Name: David Mildner - Scheduling
Phone: (301) 975-6366
Email: mildner@nist.gov

Name: Yun Liu - Instrument Scientist
Phone: (301) 975-6235
Email: yun.liu@nist.gov

Name: Katie Weigandt - Instrument Scientist
Phone: (301) 975-8396
Email: kathleen.weigandt@nist.gov

Name: Yimin Mao - Instrument Scientist
Phone: (301) 975-6017
Email: yimin.mao@nist.gov