Ultra-Small-Angle X-ray Scattering Facility

X-ray science division, beamline 9ID-C

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APS 9ID USAXS/SAXS/WAXS

Ultra-Small-Angle X-ray Scattering Facility

Contacts: e-mail, instrument scientist: Jan Ilavsky, 630-252-0866 and Ivan Kuzmenko, 630-252-0327

Ultra-Small-Angle X-ray Scattering (USAXS) is an advanced-design Bonse-Hart camera (USAXS) with integrated fixed length SAXS (500mm) and WAXS (300mm) cameras.

The USAXS/SAXS/WAXS instrument provides world-unique capabilities:

  • Standard configuration (Si 220 crystals)
  • Energy range ..........   10 - 24 keV
  • Q range ..................    0.0001 to 6 [1/A] (max depends on energy used)
  • Collection time ........  2 - 5 minutes
  • Intensity range ........  up to 12 decades (depends on sample), desmeared 
  • Q resolution ............  ~ 0.00008 [1/A] in the USAXS range (up to ~0.1 [1/A])
  • SAXS ....................... Q range ~ 0.03 to 1.3 [1/A]
  • WAXS ...................... d spacing range approximately 6A to 0.8 A, depending on energy

     
  • High resolution configuration (Si 440 crystals) - requires significant setup and alignment time, special request only
  • Energy ....................  10 - 18 keV
  • Q range ..................   0.00003 to 6 [1/A] (max depends on energy used)
  • Collection time ........ 4 - 6 minutes
  • Intensity range ........  up to 12 decades (depends on sample), desmeared
  • Q resolution ............  ~ 0.00003 [1/A] in the USAXS range (up to ~0.1 [1/A])
  • SAXS ....................... Q range ~0.03 - 1.3 [1/A]
  • WAXS ...................... d spacing range approximately 6A to 0.8 A, depending on energy

Want to see how USAXS operates? 3 min (166Mb) movie with data collection is here: USAXS_operations.mp4

For details and to cite in publications the use of the USAXS instrument, please use following publication: Ultra-small-angle X-ray scattering at the Advanced Photon Source. J. Ilavsky, P.R. Jemian, A.J. Allen, F. Zhang, L.E. Levine and G.G. Long. Journal of Applied Crystallography, 2009, 42 (3), p 469-479.

Mail in program:

We make available about 2-3 days of beatime per cycle to users, who have smaller sets of samples (typically less than 20 samples). Typical use is exploratory research (before applying for beamtime) or when project requires limited number of samples. No beamtime proposal is necessary and users cannot come for experimets to the APS. Samples will be handled by USAXS staff and reduced data will be sent back to users. For details see dedicated page

We also support SAXS-SANS collaboration mail-in program



Schematics of USAXS instrument. For illustration only, NOT for publications. For latest updated drawing please contact beamline scientist.

Schematics of USAXS instrument. For illustration only, NOT for publications. For latest updated drawing please contact beamline scientist.

Schematics of the USAXS - SAXS - WAXS instrument with all three geometries. Data are collected sequentially using the three devices. Changover time between detectors is about 30 seconds.

An in-situ USAXS-SAXS-WAXS study of precipitate dissolution and size evolution in a model gamma-gammaPrime ternary Ni-based alloy (collaboration with Dr. G. Muralidharan, ORNL). A 0.1 mm thick sample was heated from RT to 1100C at 4.5C/min while undergoing repeated USAXS-SAXS-WAXS (24 keV) at 5 minute intervals. Research sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the Propulsion Materials Program.

USAXS/SAXS/WAXS data : In situ data collected at 226 °C over about 16 hours represent microstructure evolution of AA2024 aluminum alloy (Allen, Levine, and Zhang, NIST). USAXS data enable quantification of second phase formation (size and volume), WAXS enables phase identification.

Scattering of 1 micron SiO2 spheres in aqueous solution.

USAXS/SAXS/WAXS in situ data : Data collected by LLNL (Trevor Willey et.al.) on high-explosives. The material is composite of two high-explosives and plastic binder. The WAXS clearly shows phase changes while USAXS/pinSAXS data show microstructure change as function of heating.

Scattering of 1 micron Polystyrene spheres in solution.