Technical information
Technique: Small Angle X-ray Scattering (SAXS), Wide Angle X-ray Scattering (WAXS)
Applications:  Nano structural investigation of materials, Nano particle size analyses
Radiation source :  Multipole wiggler
Photon flux at sample:  ~1e10 phs/s
Photon energy range: 6-9 keV (optimized at 8 keV)
Beam collimation: 3 slits + 1 guard slit
Monochromator type: Double Multilayer Monochromator (W/B4C)
Energy bandwidth: 1%
Focusing element Toroidal mirror
Detectors: CCD (Mar165) / Image Plate Mar 345
Sample-detector distance: 140 - 5000 mm (WAXS/SAXS modes)
Minimum q: 0.06 nm-1
Measurable characteristic length: ~ 1 - 100 nm
Sample type: Powder / solid / liquid / fiber
Sample environment: In air
Beamline status: Operational

Beamline layout

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Sample holder

Sample is attached to a sample stage and the measurement is performed in air. A sample cell with diameter 5 mm and thickness 1.5, 1.0 or 0.5 mm for sample container (powder or liquid) using aluminum foil, mica or kapton film is available. Glass/quartz capillary tubes (diameter 1, 1.5, 2 mm) are also available.

Heating / Cooling stage

A heating/cooling stage is available to perform in situ measurements. The temperature can be varied between -150 to 650 C.

Tensile / Heating / Cooling stage

A tensile stage with force up to 200 N is available for in situ tensile experiment. The tensile stage can also heat/cool the sample in the temperature range of -150 to 350 C.

Sample-detector distance calibration

Silver behenate is available on site as calibration standard for SAXS measurements. 4-Bromo Benzoic acid and other standards, such as TiO2 are available for WAXS calibration. Other standard such as rat-tail tendon, if needed, will have to be brought by users.

Data processing

Image processing program such as FIT2D (http://www.esrf.eu/computing/scientific/FIT2D/) can be used to process the measured 2D scattering patterns for further analyses.

A Matlab-based data processing program called SAXSIT which is developed in-house is also available to process the 2D scattering pattern. The program can do, for example, pattern masking, pattern alignment, circular averaging, data merging and a few other things including some simple fitting and modeling. The program SAXSIT is available for download below.

Each measured pattern file is about 8 MB and each experiment usually takes a lot of patterns. Users are therefore recommended to bring DVDs or an external hard disk to save the data to take back home.

Example of measured patterns

Collagen fiber in rat tail tendon

4-Bromo Benzoic acid

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Rubber wood (measurement of Micro Fibril Angle)

BL1.3W Station Manual

The manual for BL1.3W contains details of the instruments, sample preparation, measurement procedure, etc. The manual also contains SAXS principles and some details on data reduction and analyses. The station manual can be downloaded below (BL1.3W SAXS/WAXS Station manual). 

SAXSIT code

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The program SAXSIT has been developed by  BL1.3W : SAXS  team for processing of scattering patterns, data manipulation and some fitting and modeling. The code is written on Matlab and compiled to executable. The code can be run without Matlab. However, the Matlab Runtime Library (MCRInstaller.exe) will have to be run once on the computer. The code is available for Windows 64 bit (file SAXSIT3p65_64bit.zip and SAXSIT_SETUP64bit.zip) and Windows 32 bit (file SAXSIT3p65_32bit.zip and SAXSIT_SETUP32bit.zip) and can be downloaded below.

The current version (as of May 2013) is SAXSIT3.65. Here are things it can do:

- Pattern alignment (using standard with circular scattering pattern)

- Sample-detector distance calibration (using standard with known period size)

- Background subtraction of patterns

- Pattern median masking

- Circular averaging (to obtain 1D scattering profile as a function of 2theta or q)

- Automated data processing to automatically process multiple patterns with the same setup (such as patterns from the same sample at different temperature)

- Radial integration (to obtain 1D profile as a function of azimuthal angle)

- Calculation of Hermans orientation factor

- Guinier and Porod fits (to obtain radii of gyration or slope)

- Profile smoothing

- Data merging

- Normalization of data sets by area under curve

- Peak search

- Nano particle size and size distribution fitting

- Rod + Debye-Bueche model fitting

- Core-shell with sticky hard sphere model fitting

- Paracrystalline model fitting

- Peak function fitting (Pseudo Voigt and Pearson VII)

- A few other things

After downloading the files, please unzip and follow the procedure in readme_HowToInstall_SAXSIT.txt to install the program.

Beamline contact
Beamline scientists Dr. SupagornRugmai : supagornThis email address is being protected from spambots. You need JavaScript enabled to view it. 
    Dr. Siriwat Soontaranon : siriwatalt
Dr. Nuntaporn kamonsutthipaijit : nuntapornalt
Ms. Chonthicha Keawhan : chonthichaalt

DOWNLOAD SAXSIT

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