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25 January 2001 X-ray photon storage in a crystal cavity
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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.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Klaus-Dieter Liss, Rainer Hock, Martin Gomm, Boris Waibel, Andreas Magerl, M. Krisch, and Remi Tucoulou "X-ray photon storage in a crystal cavity", Proc. SPIE 4143, X-Ray FEL Optics and Instrumentation, (25 January 2001);


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