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The European XFEL, currently under construction, will produce a coherentX-ray pulse every 222 ns in pulse trains of up to 2700 pulses. In conjunctionwith the fast 2D area detectors currently under development, it will bepossible to perform X-ray Photon Correlation Spectroscopy (XPCS) experiments onsub-microsecond timescales with non-ergodic systems.  A case study for the Adaptive Gain Integrating Pixel Detector (AGIPD) at theEuropean XFEL employing the intensity autocorrelation technique was performedusing the detector simulation tool HORUS. As optimum results from XPCSexperiments are obtained when the pixel size approximates the (small) specklesize, the presented study compares the AGIPD (pixel size of (200 $\upmu$m)$^2$)to a possible apertured version of the detector and to a hypothetical systemwith (100 $\upmu$m)$^2$ pixel size and investigates the influence of intensityfluctuations and incoherent noise on the quality of the acquired data.  The intuitive conclusion that aperturing is not beneficial as data is 'thrownaway' was proven to be correct for low intensities. For intensities larger thanapproximately 1 photon per (100 $\upmu$m)$^2$ aperturing was found to bebeneficial, as charge sharing effects were excluded by it.  It was shown that for the investigated case (100 $\upmu$m)$^2$ pixelsproduced significantly better results than (200 $\upmu$m)$^2$ pixels when theaverage intensity exceeded approximately 0.05 photons per (100 $\upmu$m)$^2$.  Although the systems were quite different in design they varied in the signalto noise ratio only by a factor of 2-3, and even less in the relative error ofthe extracted correlation constants. However the dependence on intensity showeddistinctively different features for the different systems.

Simulation study of the impact of AGIPD design choices on X-ray Photon Correlation Spectroscopy utilizing the intensity autocorrelation technique