2. Radiation damage studies on different bulk materials
Currently there are two planar pixel technologies under investigation. N-in-n is the technology currently used in the ATLAS Pixel Detector and based on a n-bulk silicon whereas the n-in-p technology uses p-bulk material. N+ doping is used for the pixel implants on one side of the sensor whereas a p+ doping builds the bias voltage contact on the other side.
Planar pixel samples from both technologies were irradiated with protons and neutrons and tested on the ATLAS FE-I3 and FE-I4 read-out chips. Expected fluences for IBL and HL-LHC are and , respectively. These fluences were reached by irradiation campaigns in Ljubljana , Karlsruhe and CERN .