[Seminars] HEP Seminar Today - February 8

Holly Hernandez holly2 at uchicago.edu
Mon Feb 8 09:43:00 CST 2016


Monday February 8, 2016
ERC 401

Speaker: Petra Merkel (Fermilab)

Title: The Phase-1 Upgrade of the CMS Pixel Detector

Abstract: The innermost layers of the CMS tracker are built out of pixel detectors arranged in three barrel layers (BPIX) and two forward disks in each endcap (FPIX). The original CMS detector was designed for the nominal instantaneous LHC luminosity of 1 x 10^34 cm^-2 s^-1. Under the conditions expected in the coming years, which will see an increase of a factor two of the instantaneous luminosity, the CMS pixel detector would become severely inefficient thanks to data losses due to buffer overflows, as well as deterioration due to radiation damage. For this reason the CMS Collaboration is currently building a replacement pixel detector which is scheduled for installation in an extended end of year shutdown during the Winter of 2016/2017.

The Phase I upgrade of the CMS pixel detector will operate at full efficiency at an instantaneous luminosity of 1 x 10^34 cm^-2 s^-1 with increased detector acceptance and additional redundancy for tracking, while at the same time reducing the material budget. These goals are achieved using a new digital readout chip and modified powering and readout schemes, one additional tracking layer both in the barrel and in the disks, and new detector supports including a CO2 based evaporative cooling system, that contribute to the reduction of the material in the tracking volume.

I will review the design and technological choices of the Phase I detector, and discuss the status of the construction of the detector and the performance of its components as measured in test beam and system tests. The challenges and difficulties encountered during the construction will also be discussed, as well as the lessons learned for future upgrades.
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