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An Office of Science User Facility

X-ray Correlation Spectroscopy (XCS)

This site is OBSOLETE as of 30 Oct. 2017
Please go to the new XCS site



Scientific Capabilities

Scientific Applications X-ray PhotonCorrelation Spectroscopy (XPCS)
Coherent X-ray Scattering (CXS)
Scattering Geometries Small Angle X-ray Scattering (SAXS)
Grazing incidence Scattering (GI-SAXS,GID)
Wide Angle X-ray Scattering/Diffraction

Source Parameters

Photon Energy 5.5-10keV ,1st harmonic
10-25 keV,2nd and 3rd harmonic
Source Size (e-) ~ 60 x 60 µm2 (HxV) FWHM @ 8.3 keV
Source Divergence (e-) ~ 1.1 x 1.1 µrad2 (HxV) FWHM @ 8.3 keV
Repetition Rate 120, 60, 30, 10 Hz
Pulse Duration 70-300fs (highcharge mode)
~ <10fs (low charge mode)
Pulse Energy ~ 1-3 mJ (high charge mode)
~ 0.2mJ (low charge mode)
Photons per Pulse ~1x 1012 (high charge mode @ 8.3 keV)
~1x 1011 (lowcharge mode @ 8.3 keV)

Photon Beam Properties

Focusing Capability A selection(up to 10) of compound refractive
lenses can be inserted in the beam to provide
focusing at a given energy. By locating the
sample at or out of focus, the beam size at the
sample can be tuned from a couple of microns
to several tens of microns.
Beam Size at Sample
(8 keV)
Up to 750 x 750 µm2 FWHM @ 8.3keV
Energy Range 5.5-10 keV (1st harmonic)
10-25 keV (2nd and 3rd harmonic)
Energy Resolution ΔE/E Silicon (111) 1.4 x 10-4
Silicon (220) 6.1 x 10-5*
Silicon (511) 1.1 x 10-5*
Pink beam 2-3 x 10-3*

*Si(220) and (511) may not be available at start.

* Si(220) and (511) may not be available at start. Operation in
pink beam is possible but is a non standard mode of operation
and therefore requires prior discussion.

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy