APS 15ID-D USAXS/SAXS
Ultra-Small-Angle X-ray Scattering Facility
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| instrument scientist: Jan Ilavsky, 630-252-0866, ilavsky@aps.anl.gov |
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The heart of the Ultra-Small-Angle X-ray Scattering (USAXS) facility at sector 15 (ChemMat CARS) the Advanced Photon Source located at Argonne National Laboratory) is an advanced-design Bonse-Hart camera (USAXS) with integrated fixed length, He filled, pinhole SAXS camera (pinSAXS). Separately is also available pinhole SAXS camera with 0.6m, 2m, and 4m lengths and energy range 10 - 30 keV.
The USAXS/pinSAXS instrument provides World-unique capabilties:
Q range
.................. 0.0001 to 1.2 [1/A] (depending on energy used)
Intensity range ........ up to 12 decades (depending on sample)
Q resolution ............ ~ 0.00008 [1/A] in the USAXS range (up to 0.1 [1/A])
example of data is at the end of this page.
USAXS/pinSAXS and SAXS can be scheduled together, but transition time between them is about 30 minutes.
For details and to refer to 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.
Abstract: The design and operation of a versatile ultra-small-angle X-ray scattering (USAXS) instrument at the Advanced Photon Source (APS) at Argonne National Laboratory are presented. The instrument is optimized for the high brilliance and low emittance of an APS undulator source. It has angular and energy resolutions of the order of 10-4, accurate and repeatable X-ray energy tunability over its operational energy range from 8 to 18 keV, and a dynamic intensity range of 108 to 109, depending on the configuration. It further offers quantitative primary calibration of X-ray scattering cross sections, a scattering vector range from 0.0001 to 1 A-1, and stability and reliability over extended running periods. Its operational configurations include one-dimensional collimated (slit-smeared) USAXS, two-dimensional collimated USAXS and USAXS imaging. A robust data reduction and data analysis package, which was developed in parallel with the instrument, is available and supported at the APS.
1D USAXS Schematic
2-D USAXS & USAXS-XPCS Schematic 
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Channel-Cut
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Schematics of USAXS instrument. For illustration only, NOT for publications. For latest updated drawing please contact beamline scientist.
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Example of data from Bonse-Hart camera only (red) and of combined Bonse-Hart and high-q pinhole camera (blue). Note the features at high q which were not resolved using the Bonse-Hart camera only. |
Example of scattering of 1 micron Polystyrene spheres in solution.
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Example of scattering of 1 micron SiO2 spheres in aqueous solution. |
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