cSAXS – X12SA: Coherent Small-Angle X-ray ScatteringAccess to cSAXS is granted through the biannual call for proposals.
Experiment typesExperiments performed at cSAXS include, inter alia,
- Ptychographic nanotomography, see for example Dierolf et al., Nature 467, 436 (2010). Dedicated instrumentation, which is available to users, is described in Holler et al., Sci. Rep. 4, 3857 (2014).
- Optics characterization, see for example Vila-Comamala et al. Opt Express 19, 21333 (2011)
- Small-angle X-ray scattering (SAXS), e.g., Smeulders et al., Nature 478, 412 (2011), can be performed with spatial resolution as microscopy technique in 2D (Deyhle et al. Nanomed-Tanotechnol 7, 694 (2011)) and 3D (Liebi et al. Nature 527, 349 (2015)). SAXS is also available with time resolution in the millisecond range (Westenhoff et al., Nature Methods 7, 775 (2010)).
*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 times 0.5 mm
|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)*|| ~8x1011photons/sec (at E = 6.2keV, 400mA ring current)
~4x1011photons/sec (at E = 11.2keV, 400mA ring current)
~2x1011photons/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]Å-1, d-spacing = [524, 6.28] nm.
SAXS detector at 2.1 m, q = [0.004, 0.34]Å-1, d-spacing = [157, 1.85] nm.
WAXS detector [0.64, 2.8]Å-1, d-spacing = [1, 0.22] nm (vertically oriented strip detector, no orientation information from anisotropic scattering is available for the WAXS detector).
**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 Å-1, please discuss your experiment ahead of time with the beamline staff.
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.