  Results obtained with 3D columnar pixel sensors bump-bonded to the RD53A
prototype readout chip are reported. The interconnected modules have been
tested in a hadron beam before and after irradiation to a fluence of about
$1\times$$10^{16}$neq cm$^{-2}$ (1MeV equivalent neutrons). All presented
results are part of the CMS R&D activities in view of the pixel detector
upgrade for the High Luminosity phase of the LHC at CERN (HL-LHC). A
preliminary analysis of the collected data shows hit detection efficiencies
around 97% measured after proton irradiation.
