Development and Characterization of Diamond and 3D-Silicon Pixel Detectors with ATLAS-Pixel Readout Electronics

Abstract

<p>Hybrid pixel detectors are used for particle tracking in the innermost layers of current high energy experiments like ATLAS. After the proposed luminosity upgrade of the LHC, they will have to survive very high radiation fluences of up to 10¹⁶ particles per cm² per life time. New sensor concepts and materials are required, which promise to be more radiation tolerant than the currently used planar silicon sensors. Most prominent candidates are so-called 3D-silicon and single crystal or poly-crystalline diamond sensors. Using the ATLAS pixel electronics different detector prototypes with a pixel geometry of 400x50 µm² have been built. In particular three devices have been studied in detail: a 3D-silicon and a single crystal diamond detector with an active area of about 1 cm² and a poly-crystalline diamond detector of the same size as a current ATLAS pixel detector module (2x6 cm²). To characterize the devices regarding their particle detection efficienc and spatial resolution, the charge collection inside a pixel cell as well as the charge sharing between adjacent pixels was studied using a high energy particle beam.</p>