Status of the CMS Phase I Pixel Detector Upgrade

TL;DR

The paper discusses the design, development, and testing of the upgraded CMS Phase I pixel detector, which enhances tracking performance and efficiency under high luminosity conditions at the LHC.

Contribution

It introduces a new pixel detector with improved readout chip, reduced material, and advanced cooling and powering, marking a significant upgrade over previous designs.

Findings

Successful test beam performance of the new readout chip

Enhanced tracking efficiency at high luminosity

Reduced material budget and improved cooling schemes

Abstract

A new pixel detector for the CMS experiment is being built, owing to the instantaneous luminosities anticipated for the Phase I Upgrade of the LHC. The new CMS pixel detector provides four-hit tracking while featuring a significantly reduced material budget as well as new cooling and powering schemes. A new front-end readout chip mitigates buffering and bandwidth limitations, and comprises a low-threshold comparator. These improvements allow the new pixel detector to sustain and improve the efficiency of the current pixel tracker at the increased requirements imposed by high luminosities and pile-up. This contribution gives an overview of the design of the upgraded pixel detector and the status of the upgrade project, and presents test beam performance measurements of the production read-out chip.