Characterization of pixel planar sensors for the inner tracker system of the phase 2 CMS detector

This talk will present the performance of silicon pixel sensors designed for the high-luminosity run of the Large Hadron Collider (HL-LHC). The HL-LHC is expected to operate at a peak instantaneous luminosity of 7.5x10\textasciicircum 34 cm\textasciicircum -2 s\textasciicircum -1, resulting in a total fluence of 2.3x10\textasciicircum 16 n\textunderscore eq/cm\textasciicircum 2 at the innermost layer of the pixel tracker, in center of the CMS detector. The ``Phase-2'' upgrade of the pixel detector must separate particle tracks in extremely dense collision debris: 140-200 collisions per bunch crossing. These conditions require thin, highly granular sensor components and readout chips that are radiation-tolerant, fast, and efficient. We tested prototype planar pixel sensors of 50 um x 50 um pitch and 150 um thickness at the Fermilab Test Beam Facility (FTBF), and measured efficiency around 99{\%} and resolution as good as 7.5 um