Aller au menu principal Aller au contenu principal

SixS (Surfaces interfaces x-ray Scattering) is a wide-energy range (5 -20 keV) beamline dedicated to structural studies of interfaces (gas-solid, solid-solid or solid-liquid), as well as nano-objects.

SixS (Surfaces interfaces X-ray Scattering)  is a wide-energy range (5 -20 keV) beamline dedicated to structural characterization of surfaces, interfaces (solid-solid or solid-liquid), as well as nano-objects in controlled environments by means of surface-sensitive x-ray scattering techniques, such as:

Grazing Incidence X-ray Diffraction (GIXD)

Crystal Truncation Rods (CTR)

Grazing Incidence Small Angle X-ray Scattering (GISAXS)

Anomalous Surface X-ray Scattering

X-ray Reflectivity (XRR)

Coherent Scattering

Magnetic Surface X-ray Scattering (in the near future)

Experimental end-stations:

MED: a multi-environment diffractometer  is available which can accommodate various sample environments, such as high-pressure reactivity chambers, electrochemical cells, Langmuir troughs. It allows for scatvertical and horizontal diffraction geometry for surface / interface diffraction.

UHV:  the diffractometer is coupled to stationary assembly of UHV chambers (currently being installed) ; it is a unique design, and consists of an assembly of three chambers equipped with the standard UHV tools (evaporators, ion-guns, etc.) and specific instruments (Scanning Tunneling Microscope (STM), Low Energy Electron Diffraction (LEED), Auger Electron Spectroscopy (AES).

Technical Data

Energy range

5 keV - 20 keV

Resolving power

E/ΔE ~ 10-4 à 20 keV

Source

In-vacuum U20 undulator.
Source Size (sigma, μm): 388 (H) x 8.1 (V)
Source Divergence (sigma, μrad): 14.5 (H) x 4.6 (V)

Optics

Diaphragm

Quarter-wave plate (to be installed)

Fixed exit DCM Si(111)

M1, M2 mirror for harmonics rejection and vertical focussing

M3A mirror for horizontal focussing on the MED end-station (to be installed)

M3B for horizontal focussing on the UHV end-station

Experimental end-stations

Two experimental end-stations

MED:  multi-environment diffractometer

UHV: diffractometer coupled to an UHV vacuum chamber

Beam size at sample

MED: 40(H) x 25(V) µm2

UHV: 30(H) x 30(V) µm2

Beam divergence at sample

MED: 600 µrad (H) x 120 µrad (V)

UHV: 600 µrad (H) x 60 µrad (V)

Flux on sample

4 x 1013 ph/s @ 6 keV

3 x 1012 ph/s @ 15 keV

Polarisation

linear

Scientific opportunities

To be filled