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The ATLAS Forward Proton (AFP) detector is intended to measure protonsscattered at small angles from the ATLAS interaction point. To this end, acombination of 3D Silicon pixel tracking modules and Quartz-Cherenkovtime-of-flight (ToF) detectors is installed 210m away from the interactionpoint at both sides of ATLAS. Beam tests with an AFP prototype detectorcombining tracking and timing sub-detectors and a common readout have beenperformed at the CERN-SPS test-beam facility in November 2014 and September2015 to complete the system integration and to study the detector performance.The successful tracking-timing integration was demonstrated. Good tracker hitefficiencies above 99.9% at a sensor tilt of 14{\deg}, as foreseen for AFP,were observed. Spatial resolutions in the short pixel direction with 50 {\mu}mpitch of 5.5 +/- 0.5 {\mu}m per pixel plane and of 2.8 +/- 0.5 {\mu}m for thefull four-plane tracker at 14{\deg} were found, largely surpassing the AFPrequirement of 10 {\mu}m. The timing detector showed also good hit efficienciesabove 99%, and a full-system time resolution of 35 +/- 6 ps was found for theToF prototype detector with two Quartz bars in-line (half the final AFP size)without dedicated optimisation, fulfilling the requirements for initiallow-luminosity AFP runs.

Beam tests of an integrated prototype of the ATLAS Forward Proton detector