Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 94: Poster IV A (Laser; Devices; Heterostructures; Surfaces, interfaces and defects)
HL 94.8: Poster
Thursday, March 19, 2015, 14:00–20:00, Poster B
pnCCD response for hard X-ray pulses — Mohammad Shokr1, Alaa El Ghashi1, Ali Abboud1, Sebastian Send1, Robert Hartmann2, •Lothar Strüde2, and Ullrich Pietsch1 — 1) University of Siegen, Solid State Physics, Siegen, Germany — 2PNSensor GmbH, München, Germany
Differing from other CCD concepts, pnCCD can be used as a four-dimensional detector with two spatial coordinates,one energy coordinate, and a time coordinate running with fast frame rates (1000 images/sec), high quantum efficiency, high energy resolution and low electronic noise. Because the attenuation coefficient of photoelectric absorption is high enough at low energy (below 20keV),the interaction of X-ray photons takes place entirely within the silicon bulk material. This is not the case for hard X-ray radiation where the photoelectric attenuation coefficient become very low while the contribution of Compton scattering increases and starts to be the dominant interaction process. Due to inelastic scattering an incoming photon creates a bunch of scattered electrons which themselves may initiate additional multi scattering events leading to additional features in the detector response function. In this paper we show simulations of the detector response for high energy X-ray photons. The simulated data will be compared to data taken by means of a commercial high energy x-ray source using the pnCCD detector.