The Phase 1 Upgrade for CMS includes the installation of a new pixel subdetector, complete with newly designed readout chips as well as a new geometry. This upgrade is necessary to replace the existing irradiated pixel subdetector with one designed for higher instantaneous luminosities. It also provides an opportunity to improve the resolution of track reconstruction and vertex isolation.

The new geometry and higher beam energies available after the upgrade increase the flux of ionizing radiation traveling through the pixel subdetector. Results of a simulation that estimate pixel hits, and thus provide an opportunity to estimate data rates and flux, will be shown. The simulation incorporates a variety of factors affecting the estimated data rates and flux, including various luminosities, bunch spacings, and beam spot locations.

The simulation determines the number of data links per module necessary to maintain data rates within design limitations.