Silicon Sensors for High-Luminosity Trackers - RD50 Collaboration Status Report

The revised schedule for the Large Hadron Collider (LHC) upg rade foresees a significant increase of the luminosity of the LHC by upgrading towards the HL-LHC ( High Luminosity-LHC). The final upgrade is planned for around the year 2023, followed by the HL-LHC running. This is motivated by the need to harvest the maximum physics potenti al from the machine. It is clear that the high integrated luminosity of 3000 fb − 1 will result in very high radiation levels, which manifest a serious challenge for the detectors. This is espe cially true for the tracking detectors installed close to the interaction point. For HL-LHC, all-s ilicon central trackers are being studied in ATLAS, CMS and LHCb, with extremely radiation hard silico n sensors to be employed in the innermost layers. Within the RD50 Collaboration, a massive R&D; program is underway, with an open cooperation across experimental boundaries to deve lop silicon sensors with sufficient radiation tolerance. This report presents several researc h topics of the collaboration and highlights some recent results. Emphasize is given on results of sensor s made from p-type silicon bulk, which have superior radiation hardness as they collect elec trons instead of holes. A further area of activity is the development of advanced sensor types like ac tive edges, thin, charge multiplication and 3D detectors. Results are shown from several detector te chnologies and silicon materials at radiation levels corresponding to HL-LHC fluences. Based on the results, recommendations are given for the silicon detectors to be used for LHC detector up grades