SAXSpoint with MetalJet Source

SAXSpoint now integrates the high-brightness MetalJet X-ray source enabling ultra-fast SAXS measurements in the laboratory.

MetalJet technology with advanced X-ray optics

In conventional X-ray sources, X-rays are generated by accelerating  electrons onto a metal anode, a process in which a high amount of heat is generated. The dissipated heat limits the power of solid anode X-ray tubes. In Excillum’s MetalJet source the solid target is replaced by a liquid metal jet, therefore the power density of the anode beam can be increased, resulting in an X-ray beam of high brilliance and power.

The highly brilliant and small spot of the MetalJet source puts great demands on the precision of X-ray multilayer optics. The new SAXSpoint system integrates a high-performance multilayer ASTIX-f by AXO DRESDEN delivering an X-ray beam of highest spectral purity and ultimate flux.

In combination with a large range of versatile sample stages and the fully integrated EIGER hybrid photon counting (HPC) detector, researchers can now fully exploit the benefits of SAXSpoint with MetalJet source and ASTIX-f optics: shortest exposure time for all nanomaterials, high resolution at compact system size and excellent signal-to-noise ratio providing highest data quality.

Experimental and Results

A mesoporous carbon sample (CJ-c) was measured with the SAXSpoint system equipped with a Ga MetalJet source running at 200 W, a customized ASTIX-f optics and an EIGER R 1M detector. The spot size of the Gallium X-ray beam (9.24 keV) was 20 μm. In combination with the high-flux X-ray optics this setup delivers a highly monochromatic Ga Kα beam with excellent photon flux of >109 ph/s at the sample position. The X-ray beam is focused onto the detector plane in order to achieve an excellent resolution and flux with the compact SAXSpoint system.

The 2D and 1D scattering patterns of sample CJ-c are shown in Figs. 1 and 2. With an exposure time of only 1 s an excellent data quality is obtained, i.e. excellent signal-to-noise ratio and statistics. Fig. 2 shows the comparison with a conventional microsource (50 W), the more intense and less noisy SAXS pattern of the MetalJet system is clearly visible.

Fig.1:      2D scattering pattern of the mesoporous CJ-c sample.

Fig. 2: 1D scattering profile of CJ-c measured with MetalJet source (-) and a conventional microsource (-).

Samples kindly provided by A. Palmqvist/C. Janson, Chalmers University of Technology

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