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cSAXS – X12SA: Coherent Small-Angle X-ray Scattering

Access to cSAXS is granted through the biannual call for proposals.

Access to PSI data analysis center is described in Photon Science Data Analysis.

Experiment types

Experiments performed at cSAXS include, inter alia,
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Setup Images

Images of some typical setups can be found under Endstations.

Technical Data

Energy range 4.5 – 18.5 keV
Energy resolution ΔE/E < 0.02%
Spot size on sample (horizontal × vertical) variable from 1.5 × 0.8mm2 to 25 × 10µm2
total flux (at sample position)* ~2x1012photons/sec (at E = 6.2keV, 400mA ring current)
~1x1012photons/sec (at E = 11.2keV, 400mA ring current)
~5x1011photons/sec (at E = 13.6keV, 400mA ring current)
Coherent flux** ~5×109photons/sec (at E = 11.2keV, 400mA ring current)
q-range (@11.2 keV) SAXS detector at 7.2 m, q = [0.0012, 0.1]-1, d-spacing = [524, 6.28] nm.
SAXS detector at 2.1 m, q = [0.004, 0.34]-1, d-spacing = [157, 1.85] nm.
WAXS detector [0.64, 2.8]-1, d-spacing = [1, 0.22] nm (vertically oriented strip detector, no orientation information from anisotropic scattering is available for the WAXS detector).
*measured with scattering from calibrated glassy carbon (Fan Zhang et. al., Metallurgical and Materials Transactions A, DOI: 10.1007/s11661-009-9950-x) for 11.2 keV and 13.6 keV and crossed checked with a transmission diode, for 6.2 keV only the diode measurement is given. All measurements were carried with an entrance slit aperture of 0.5 mm x 0.5 mm and scaled up to the whole beam size of 1 mm x 0.7 mm. Note that the flux at the sample position depends on specific experimental settings and optics used. Please contact the beamline staff to get more information.

**estimate based on calculations and measurements at related beamlines, not (yet) measured at cSAXS

the lower ends of the q-range for the SAXS detector require a special beamstop arrangement and are significantly more affected by parasitic scattering. If you need very low q-range information, below e.g. 0.002 -1, please discuss your experiment ahead of time with the beamline staff.