Study of CMS pixel detectors for HL-LHC

The High-Luminosity LHC (HL-LHC) will study with proton-proton collisions at a center-of-mass energy of 14TeV. It will accumulate data samples for searches for physics beyond the standard model corresponding to 10 times more luminosity than in previous LHC runs. The physics program depends on precise measurements of charged particles close to the beams. The CMS experiment at the LHC will use layers of pixel detectors with high granularity and radiation hard sensors bump-bonded to readout chips. The pixel detector components are in the pre-production phase and evaluating prototypes of sensor-chip assemblies with electronic charge-injection methods, including tests radiation hardness of final iterations of the readout chip with ⁶⁰Co photon sources at the Sandia National Laboratory. For detector layers closest to the beam, 3D silicon sensors are possible candidates. They are evaluated for functionality and radiation hardness up to fluences equivalent to 10 years of HL-LHC operation with proton beams. Novel testing methods and preliminary results from the above pre-production phase are presented here.