High-energy Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source
Andrew J. Allen, Lyle E. Levine, Fan Zhang, Gabrielle G. Long, Jan Ilavsky, Pete R. Jemian
This paper reports recent tests performed on the Bonse-Hart-type ultra-small angle X-ray scattering (USAXS) instrument at the Advanced Photon Source with higher-order reflection optics Si (440) instead of Si (220) and with X-ray energies greater than 21.0 keV. Our results demonstrate the feasibility of high-energy operation with narrower crystal reflectivity curves, which provides access to a scattering vector range from ≈ 2 × 10-5 to 1.8 Å-1 and up to 12 decades in the associated sample dependent scattering intensity range. The corresponding size range of the scattering features spans about 5 decades from less than 1 Å to ≈ 30 μm. These tests have indicated that mechanical upgrades are required to ensure the alignment capability and operational stability of this instrument for general user operations due to the tighter angular-resolution constraints of the higher-order crystal optics. These upgrades are now underway.
, Levine, L.
, Zhang, F.
, Long, G.
, Ilavsky, J.
and Jemian, P.
High-energy Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source, Journal of Applied Crystallography, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911966
(Accessed December 2, 2023)