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SAMBA (Spectroscopy Applied to Material Based on Absorption) is a hard X-ray absorption spectroscopy (XAS) beamline. SAMBA is open to a broad scientific community spanning from physics to chemistry, surface and environmental sciences.

 

SAMBA (Spectroscopy Applied to Material Based on Absorption) is a hard X-ray absorption spectroscopy (XAS) beamline. SAMBA is open to a broad scientific community spanning from physics to chemistry, surface and environmental sciences. The design of SAMBA optics is optimized in order to be very versatile and to cover the 5-40 keV energy range with a high flux of photons and stability and optimum energy resolution. The monochromator runs in continuous scan mode, and a 35 pixels HPGe fluorescence detector is available for measurements on highly diluted specimens.

 

Team

FONDA
FONDA Emiliano
Beamline Manager
LANDROT
LANDROT Gautier
Beamline Scientist
ZITOLO
ZITOLO Andrea
Beamline Scientist
ALIZON
ALIZON Guillaume
Beamline Engineer Assistant
KHAN
KHAN Anastassiya

 

 

Technical data

Energy range

Between  4.9 to 40 keV

 
Energy Resolution (ΔE/E)

Si(220) : 6x10-5 @ 15 keV

 
Source

Bending Magnet  Radiation (Ec = 8.65 keV)  1.5 mrd Horizontal x 1 mrd Vertical

 
Flux in the XAS hutch

Si(220) : 2.8x10+11 Phot/s/0.1%bw @ 15 keV 
Si(220) : 2.3x10+10 Phot/s/0.1%bw @ 35 keV

 
Optics

A sagittal focusing monochromator between two bendable cylindrical mirrors

 
Sample Environment

Many ancillary devices like cryostats (He liq and N2 liq), furnaces, electrochemical cells, liquid cells, and many sample-holders.

UV-Visible Spectroscopy

Differential Scanning Calorimetry

(x-ray diffraction as a further developement)

 
Beam size at sample (EXAFS hutch)

200x300 μm2

 
Beam size at sample (SurfAs hutch)

300x300 μm2

 
Detectors

Ionisation chambers (Transmission)

Canberra 35-elements monolithic planar Ge pixel array detector, Multi-elements Germanium detector or a Vortex silicon drift detector (Fluorescence)

Total electron yield
SAMBA domaine énergie

 

Scientific opportunities

Material science

Energy storage

Determination of structural and electronic properties and average size of nanosystems. Dynamic or static study of new anodic or cathodic materials. Understanding of magnetic phase transition of molecular system in coordination chemistry. Characterisation of glasses, Sol-Gel etc...

Physic Investigation of clusters embedded in matrices.
Biology, Biomaterials

Study of reactivity of biomimetic compounds which are used as simple model compounds to understand the mechanism of catalysis of more sophisticated systems like metallo-enzymes. Investigation of metal ions present in metallo-proteins and in bio-inorganic complexes.

Earth and environmental sciences

Local environment probe of any element in natural systems (soils, sediments, snow, plants, microorganisms ...).

Surface science

Characterisation of the local structure of thin films at the very first stages of growth. Study of the interfaces : metal/metal, metal/semiconductor and oxides/metal.

Catalysis

Structural and electronic characterisation of catalysts in order to understand/predict their catalytic activity/selectivity in a given reaction. (DeNOx catalysis, Fischer-Tropsch, hydrogenation of hydrocarbons ...).

 

 

 

Optical Hutch

Optical layout

 

Mirrors

Two cylindrically bendable silicon mirrors (WinlightX) coated by a layer of 50 nm of Pd are used for providing:

  1. vertical collimation of the beam
  2. vertical focusing of the beam at the sample position
  3. harmonic rejection.

The mirrors are used over the whole 4-40 keV energy range available on the beamline by tilting the mirrors from 10 mrad to 1 mrad (i.e. 0.57° to 0.057°) depending on the desired cut-off energy for removing the harmonic X-rays.

Reflectivity SAMBA mirror
 

The reflective Pd surfaces are 1200 mm long per 88 mm wide allowing a horizontal acceptance of about 6.2 mrad on the first collimating mirror located at 14.1 m from the source. The surface of the mirrors was polished to a rms roughness less than 3 Ǻ rms and to a  longitudinal slope error less than 2µrad rms. The first mirror is water cooled using blades immersed in In-Ga eutectic in grooves in the mirror surface.

The focusing in the vertical direction is ensured by the M2 mirror, the resulting vertical spot size at the sample position is 110 µm (FWHM) with a foot size of about 300 µm.

cylindrical curvature for M2

Sagittal focusing double crystal monochromator

Sagittal focusing double crystal monochromator

Sagittal focusing double crystal monochromator


Sagittal focusing double crystal monochromator

The sagittally focusing Double Crystal Monochromator (DCM) provided by Oxford Danfysik is used in the so-called high flux mode. The DCM is installed at 16.1 m from the source. It deals of a first flat water-cooled Si(220) crystal and a sagittally bent 2nd crystal. The main Bragg axis of rotation passes through the centre of the diffracting face on the 1st crystal and perpendicular to the beam axis. In this way, the incident white beam is always centred on the axis of rotation. A fixed offset to the exit beam is achieved by moving the 2nd crystal perpendicularly to the first one according to the Bragg angle. In this case the beam moves along the axis of the sagittally-bent 2nd crystal. The first crystal is indirectly water-cooled by using a multi-channel water cooling support (SOLEIL original design) in contact with the crystal through a thin film of In-Ga eutectic. The 2nd crystal is uncooled.

The horizontal acceptance of the monochromator is limited by the efficiency of the sagittal bender. For a horizontal acceptance of 1.5 mrad, the typical beam size at the sample position is around 300 µm (H) x 200 µm (V) (FWHM).

In order to avoid possible radiation damage on the sample due to the high density of photons in a so small spot, the beamline is often slightly defocused in both directions to achieve a spot size of 2 mm (H) x 1mm (V).

The typical flux at the sample position at 8.5 keV is 5×1011 ph/s (6 mrad of vertical acceptance and 1.5 mrad of horizontal acceptance, I = 400 mA).

Related publications: 

SAMBA: The 4-40 keV X-ray Absorption Spectroscopy Beamline at SOLEIL. 
V. Briois, E. Fonda, S. Belin, L. Barthe, C. La Fontaine, F. Langlois, M. Ribbens, F. Villain 
UVX 2010 - 10e Colloque sur les Sources Cohérentes et Incohérentes UV, VUV et X ; Applications et Développements Récents: 41-47. EDP Sciences 2011

 

EXAFS Hutch

Find in the following, the detection modes available on the EXAFS experiment, the different combination of techniques and some ancillary equipments.

 

Detection

Transmission :

chambre ionisationOxford ionization chambers

Fluorescence :

fluorescence camberra Canberra 35-elements  monolithic planar Ge pixel array detector

Detector Silicon Drift : Vortex Detector Silicon Drift : Vortex

Total electron yield

The sample must be electrical conductor otherwise a thin layer of graphite may be evaporated. 

Beam size using capillary : 75μm x 75μm

Application in Environmental science as an example, but also microfluidic application and grazing incidence of thin films. 

capillary montage

CombinedTechniques

XAS with UV-visible spectroscopy

Cary 50 VARIANCary 50 VARIAN

  • With optical fibers
  • 190 < I < 1100 nm
  • VScan < 24000 nm/min
  • XAS cell with mylar or PP windows for optical fiber used in transmission
  • or immersion probe : 2 or 10 mm
  • or cuvettes Quartz, Glass, PMMA, PS

 

XAS with Differential Scanning Calorimeter (DSC)

DSC 111 Setaram :

DSC 111 Setaram Calvet type differential scanning calorimeter 
-120 to 800°C 


  * Phase transition (fusion, crystallization,
     glass transition, polymerization, degradation)
  *  Cp Evaluation
  *  Monitoring of reactions 
      (oxidation, reduction, dehydration...)

 

 

 

 

 

Catalysis

Gas blower

quartz capillary oven for operando measurements up to 850°C and 10-15 bars

Gas distribution system

  • Complex mixtures
  • Humidifier
  • Heated lines 
  • Remote control

 

Low temperature

He cryostat suitable for transmission and fluorescence detection (20 K to 500K). Liquid nitrogen (80 K) can also be used

 

Grazing incidence

  • Sample T° :  900°C
  • T° Ramp : 10 à 30°C/min
  • Pressure:  5.10-7mbar
  • possible to work under partial gas pressure 
  • Modes Transmission (Reflexafs) and Fluorescence possible

Liquid Cells

We have cells with different optical path available for basic or acidic solution. Kapton, Mylar, PP or PTFE can be used as windows depending of the nature of the solution.

 

Information for the users, help for preparation and submission of proposal.

 

Gas

The application for the use of specialty gases must be stipulated in your proposal in order that the security service can assess the associated risks. Specialty gases must be commanded 8 weeks before your experiment, also you have to prevent your local contact well in advance, for common gases (helium, argon, nitrogen, hydrogen, air and oxygen) only 2 weeks are sufficient.  

 

Helium Liquid

The application for the use of helium liquid must be stipulated in your proposal and recalled to your local contact in such a way to order sufficiently in advance the suitable volume.

 

Sample positioning

Two schemas of implantation for new experimental set-up on the EXAFS table could be hold, but contact your local contact is mandatory.

schemas of implantation for new experimental set-up on the EXAFS tableschemas of implantation for new experimental set-up on the EXAFS table

 

Information on project proposal submission

Beamtime Applications 
Projects are examinated twice a year by an independant peer review commitee. The projects must be filled via the SunSet Application 

Two important deadlines (standard & BAG project) : 
15 February - 15 September

 

How to prepare your Beamtime application ?

Project must be written in english and submissions must comply with the following framework : 

Online submission of the web form to give general information 

1. Description of the scientific background and experimental part 
2. Figures or images in annex (format .jpeg .png) 
3. Description of experimental conditions with special safety measure 
4. Submission of the proposal

(If the application constitutes the project continuation, filing in a report of the previous experiment in the SunSet and mention of related publications are necessary) 

Also, 

- It is strongly advised to contact one of the beamline scientist, they will assist in the definition of the setups necessary for the desired experiment and in the assessment of the best conditions. 
- The justification of the required beamtime is required. 

Do not forget to mention your related publications in the sunset. 

For more informations : The general User's guide  The general User's guide  

 

SAMBA proposes a software for XAFS data treatment, available for Windows, Mac, and Linux.

Latest release: Fastosh v 1.0.0

Open the PDF file « Version description » to find out what’s new in the latest version.

 

Unique functionalities for all XAFS Users:

  • To rapidly upload to the program >100 XAFS spectra (ASCII files OK)
  • To automatically display averages & estimate random noise
  • To create chunk merges from a set of scans
  • To perform PCA, Target Transformation, or MCR-ALS
  • To do Linear Combination Fitting using a friendly interface
  • To smooth a data set using a 2D (energy & tile directions) filter
  • To deglitch scans using multiple approaches
  • To easily create 3D plots

 

Specific functionalities for SAMBA Users:

  • To visualize and exploit all fluorescence data saved in SAMBA HDF files
  • To extract artefact-free, optimized XAFS spectra using fluorescence detector pixel & MCA data
  • To access to all contextual info relative to each spectrum (motor positions, scan & dcm parameters, etc…)

 

Windows Installer

Mac Installer

Linux Installer

Version Description (PDF)

USER MANUAL

 

Downloads