Silicon is wonderful stuff: The Phase I Upgrade of the CMS Pixel Detector
| Date/Time: | Friday, 23 Sep 2016 from 3:00 pm to 4:00 pm |
|---|---|
| Location: | Zaffarano, A421 |
| Contact: | Chunhui Chen |
| Phone: | 515-294-5062 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
It was once thought that high luminosity environments would render tracking devices inoperable. Then technological advances in the semiconductor industry opened the possibility of using silicon detectors. The original CMS pixel detector was designed for the nominal instantaneous LHC luminosity of 1 x 10^34 cm^-2 s^-1. The LHC has already started to exceed this luminosity causing the CMS pixel detector to see a dynamic inefficiency caused by data losses due to buffer overflows. For this reason CMS has been building an upgraded pixel detector which is scheduled for installation during an extended year end technical stop during winter 2016/2017. The phase 1 upgrade includes four barrel layers and three forward disks, providing robust tracking and vertexing for LHC luminosities up to 2 x 10^34 cm-2 s-1. The upgrade incorporates new readout chips, front-end electronics, and dual-phase CO2 cooling to achieve performance exceeding that of the present detector with a lower material budget. This seminar will review the design and technology choices of the Phase I detector and discuss the status of the detector upgrade. The challenges and difficulties encountered during the construction will also be presented, as well as the lessons learned for future upgrades.