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microXAS - X05LA: Environmental & Materials Sciences

The microXAS beamline at the Swiss Light Source (SLS) corresponds to a versatile, in-vacuum undulator based hard x-ray microprobe facility. The beamline is covering the large spectral range from ~3keV up to ~23 keV, delivering monochromatic radiation as well as full ‘white’ light. Employing different focusing concepts, the beamline provides several types of high-brilliance focused beams, covering a large range of spatial resolutions from hundreds of micrometers down to nanometer size. The instrument is devoted to high resolution multimodal chemical imaging based on X-ray fluorescence, X-ray spectroscopy and X-ray diffraction techniques. The variety of complementary imaging modes can be employed routinely in quasi-simultaneous manner to record 2D images of several chemical properties. The progression of the imaging capabilities to full three dimensions using tomographic approaches is currently in progress.


Two additional features make the microXAS beamline a rather exceptional and exclusive X-ray microprobe facility. First, the microXAS beamline permits the investigation of radioactive materials and corresponds to the world-wide solely microprobe facility being able to analyze radioactive sample with 1µm spatial resolution. Second and definitely going beyond any existing X-ray microprobe instrumentation, the FEMTO project is an integral part of the microXAS beamline project. Ultrafast time-resolved X-ray studies with a resolution of picoseconds down to ~100 femtoseconds are ‘routinely’ carried out at the microXAS beam line.

Technical Overview

Energy range ~3 - 23 keV
Flux on sample 2 x 1012 ph/s/400 mA
Spot size on sample± 1 x 1 µm2
Polarization linear horizontal
Photon energy resolution 0.02%

Research Highlights

24. Januar 2023
Tool Steel

Solidification modes during additive manufacturing

The thermal conditions during laser-based additive manufacturing are inferred from high-speed X-ray diffraction data and can be linked to a model for rapid solidification.

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4. Dezember 2022
EBSD image of prior beta grains

Thermal cycling during 3D laser printing

High-speed in situ X-ray diffraction is used to measure temperature profiles and cooling rates during 3D printing of a a Ti-6Al-4V single-track wall.

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23. September 2022
Phase fractions in Ti-6Al-4V-3Fe

In situ alloying during additive manufacturing

In situ alloying is an effective method to engineer microstructures of additively manufactured Ti6Al4V3Fe alloys. 

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