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Proceedings Paper

X-ray photon storage in a crystal cavity
Author(s): Klaus-Dieter Liss; Rainer Hock; Martin Gomm; Boris Waibel; Andreas Magerl; M. Krisch; Remi Tucoulou
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Paper Abstract

With the upcome of shorter and shorter time scales, time dependence of multiple diffraction effects will play a fundamental role in X-ray optics. Here we report on experimental X-ray photon storage in backscattering geometry between two silicon crystal slices cut from a monolithic ingot. The slices are 150 mm apart and wedge shaped to vary the diffracting thickness between 50 micrometers and 500 micrometers . A photon energy of 15.816 keV fulfills the condition for the 888 Bragg reflection. We used the dedicated backscattering beamline ID28 at ESRF which delivers a highly monochromatic beam equal to the natural width of the reflection considered. In Bragg condition, each crystalline boundary of the cavity has a probability of photon transmission and reflection, the ratio depending on the crystal thickness. Once a photon is transmitted by the first slice, it can be reflected by the second crystal and so on. A fast avalanche detector positioned behind the cavity detects the photons as a function of time with respect to the synchrotron bunches. Thus, photons that exit in direct transmission, or after N multiple forth and back bounces are separated by N times one nanosecond. Up to 14 reflections could be observed. The experiment demonstrates not only feasibility of photon storage in crystal cavity which may be relevant in the X-ray optics for a free electron laser but it also points towards the importance of time domain, where pulses shorter than the diffracting volume may be deformed and shaped considerably due to multiple scattering.

Paper Details

Date Published: 25 January 2001
PDF: 11 pages
Proc. SPIE 4143, X-Ray FEL Optics and Instrumentation, (25 January 2001); doi: 10.1117/12.413682
Show Author Affiliations
Klaus-Dieter Liss, European Synchrotron Radiation Facility (France)
Rainer Hock, Friedrich-Alexander Univ. Erlangen-Nurnberg (Germany)
Martin Gomm, Friedrich-Alexander Univ. Erlangen-Nurnberg (Germany)
Boris Waibel, Motoren- und Turbinen-Union GmbH (Germany)
Andreas Magerl, Friedrich-Alexander Univ. Erlangen-Nurnberg (Germany)
M. Krisch, European Synchrotron Radiation Facility (France)
Remi Tucoulou, European Synchrotron Radiation Facility (France)


Published in SPIE Proceedings Vol. 4143:
X-Ray FEL Optics and Instrumentation
Dennis M. Mills; Horst Schulte-Schrepping; John R. Arthur, Editor(s)

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