Ms Caroline Niemeyer (University of Hamburg)
For the HL- LHC the irradiation level that the detectors will have to withstand will be reaching a 1 MeV neutron equivalent fluence of 2×10^16neq/cm2 and a total ionizing dose of 10 MGy at the location where the sensors of the Inner Tracker will be installed. The upgraded Phase-2 Inner Tracker is designed to maintain or improve the tracking and vertexing capabilities under these high pileup and radiation conditions. Various pixel sensor designs have been fabricated and bump bonded to ROC4Sens read-out chips and are evaluated for radiation hardness, spatial resolution and charge collection efficiency as well as pixel hit efficiency using the DESY test beam facilities. The shallow angle method is used to measure the depletion depth and possibly trapping effects due to irradiation as the track passes the pixel cells in varying depths. The edge-on method allows for in-silicon tracking and thus to obtain the intrinsic position resolution of the silicon sensors without using an external reference tracking detector. The results of these measurement methods on the new pixel sensor designs will be presented.