The construction of the phase-1 upgrade of the CMS pixel detector

Conference · Fri Dec 22 04:00:00 EST 2017 · Journal of Instrumentation

DOI:https://doi.org/10.1088/1748-0221/12/12/C12049· OSTI ID:1471733

Weber, H. ^[1]; Weber, H. ^[1]

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1. Fermilab

The innermost layers of the original CMS tracker were built out of pixel detectors arranged in three barrel layers and two forward disks in each endcap. The original CMS detector was designed for the nominal instantaneous LHC luminosity of 1×10³⁴ cm^-2s^-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 have seen a dynamic inefficiency caused by data losses due to buffer overflows. For this reason the CMS collaboration has installed a replacement pixel detector during the recent extended end of year shutdown. The phase-1 upgrade of the CMS pixel detector will operate at high efficiency at an instantaneous luminosity of 2×10³⁴ cm^-2s^-1 with increased detector acceptance and additional redundancy for the tracking, while at the same time reducing the material budget. These goals are achieved using a new read-out chip and modified powering and read-out 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. This contribution will review the design and technological choices of the phase-1 detector.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: CMS Tracker Group
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1471733
• Report Number(s): FERMILAB-CONF-17-681-CMS-E-PPD; 1646575
• Conference Information: Journal Name: Journal of Instrumentation Journal Issue: 12 Journal Volume: 12
• Country of Publication: United States
• Language: English

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