Diamond pixel modules and the ATLAS beam conditions monitor

Chemical vapor deposition diamonds are considered among possible sensor materials for the next pixel upgrade in ATLAS. Full size diamond pixel modules have been constructed to the specification of the ATLAS Pixel Detector using poly-crystalline CVD diamond sensors to develop the production techniques required for industrial production. Those modules were tested in the lab and testbeam. Additionally we will present results of diamond pixel modules using single-crystal diamonds and results of proton irradiations up to 1.8 ×1016 protons/cm2. The ATLAS Beam Conditions Monitors (BCM) main purpose is to protect the experiments silicon tracker from beam incidents. In total 16 1 × 1 cm 2 500 μ m thick diamond pCVD sensors are used in eight positions around the LHC interaction point. They perform time difference measurements with sub nanosecond resolution to distinguish between particles from a collision and spray particles from a beam incident; an abundance of the latter can lead the BCM to provoke an abort of LHC beam. The BCM diamond detector modules, their readout system and the algorithms used to detect beam incidents are described. Results of the BCM operation with circulating LHC beams and its commissioning with first LHC collisions are reported.