(introduction)=
# The cSAXS Beamline

## Overview

cSAXS is a beamline dedicated to small-angle X-ray scattering (SAXS) and coherent diffractive imaging, particularly ptychography, located at the Swiss Light Source at the Paul Scherrer Institut in Villigen, Switzerland. See the beamline's endstations website for information on experimental setups, geometries, and sample preparation details. We strongly encourage all prospective users to discuss their experimental plans with the beamline staff before submitting proposals.

Access to cSAXS is granted through the biannual SLS 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,

* Ptychographic nanotomography, see for example Dierolf et al., Nature 467, 436 (2010) or Holler et al., Nature Electronics 2, 464 (2019). Dedicated instrumentation, available to users, is described in Holler et al., Sci. Rep. 4, 3857 (2014), Holler et al., Rev. Sci. Instrum. 88, 113701 (2017), Holler et al., Rev. Sci. Instrum. 89, 043706 (2018), and Holler et al., J. Synchrotron Rad. 27, 730 (2020).
* 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 (Bunk et al. New J. Phys. 11, 123016 (2009)) 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)).