Hard X-ray spatial coherence measurements using a double slit interference


Hard X-ray spatial coherence measurements using a double slit interference

Leitenberger, W.; Wendrock, H.; Bischoff, L.; Pietsch, U.; Panzer, T.; Grenzer, J.

The spatial coherence of hard X-rays provided by a bending magnet of the storage ring BESSY II was investigated performing Young's interference experiment. The interference pattern was created by the diffraction of two 2 µm pinholes drilled into a thin tantalum foil by focused ion sputtering. Using an energy-dispersive detector with an energy resolution of 200 eV the interference pattern were detected simultaneously between 5 keV < E < 16 keV scanning a 5 µm pinhole through the detector window. The set-up is suitable to characterise the coherence properties of the beamline in a simple manner, i.e. to deduce parameters as the effective source size, the coherence length and the visibility. For the present case the visibility is near 100% at 5 keV and decreases to 20% at 16 keV.

Keywords: double slit experiment; coherent X-rays; white X-ray radiation

  • Lecture (Conference)
    Workshop on Exploiting the Coherence of X-rays, Motzen, Germany, September 23 - 24, 2002

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