The CMS Phase-1 pixel detector

The CMS silicon pixel detector allows for precise track parameter measurements and vertex reconstruction. The current detector is designed to operate at a maximum luminosity of 1x 10(34) cm(-2) s(-1). The Phase-1 pixel upgrade is planned to meet or exceed the necessary performance at the expected peak luminosity of 2 x10(34) cm(-2) s(-1) of the updated accelerator in an environment where there are many interactions per beam crossing. The new low mass pixel detector will have four barrel layers and three forward/backward disks to provide four pixel hits on tracks. Radiation damage, rate limitations, and performance are being simulated and measured.