Abstract

The spatial coherence of hard X-rays provided by a bending magnet of the storage ring BESSY II was investigated by performing Young's interference experiment. The interference pattern was created by the diffraction of two 2 m 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 patterns were detected simultaneously between 5 keV<E<16 keV scanning a 5 m pinhole through the detector window. The set-up is suitable to characterize 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 was close to 100% at 5 keV and decreased to 20% at 16 keV.

Author Keywords: Double slit experiment; Coherent X-rays; White X-ray radiation

Article Outline

1. Introduction

2. Experiment

3. Results

4. Summary

Acknowledgements

References

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Fig. 1. Experimental set-up at the EDR-beamline at BESSY II.

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Fig. 2. Electron microscope image of the 30 m tantalum foil containing the two micro-pinholes 11 m separated (exposure at 10° tilt angle).

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Fig. 3. Normalized diffracted intensity as a function of energy and the distance from the optical axis.

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Fig. 4. Normalized interference fringes obtained with the double pinhole at three different energies (a)–(c) 6 keV, 10 keV and 14 keV. The squares indicate the measured data from Fig. 3 and the lines indicate the results of the best fit of Eq. (1).

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Fig. 5. Visibility of the interference fringes as a function of energy.

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17. I. K. Robinson personal communication.

Corresponding author. Tel.:+49-331-977-11-10; fax: +49-331-977-11-33