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

Abstract

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.

Authors:
 [1];  [1]
  1. Fermilab
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Tracker Group
OSTI Identifier:
1471733
Report Number(s):
FERMILAB-CONF-17-681-CMS-E-PPD
1646575
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Journal Name:
JINST
Additional Journal Information:
Journal Volume: 12; Journal Issue: 12; Conference: 11th International Conference on Position Sensitive Detectors, Milton Keynes, UK, 09/03-09/08/2017
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Weber, H., and Weber, H. The construction of the phase-1 upgrade of the CMS pixel detector. United States: N. p., 2017. Web. doi:10.1088/1748-0221/12/12/C12049.
Weber, H., & Weber, H. The construction of the phase-1 upgrade of the CMS pixel detector. United States. doi:10.1088/1748-0221/12/12/C12049.
Weber, H., and Weber, H. Fri . "The construction of the phase-1 upgrade of the CMS pixel detector". United States. doi:10.1088/1748-0221/12/12/C12049. https://www.osti.gov/servlets/purl/1471733.
@article{osti_1471733,
title = {The construction of the phase-1 upgrade of the CMS pixel detector},
author = {Weber, H. and Weber, H.},
abstractNote = {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.},
doi = {10.1088/1748-0221/12/12/C12049},
journal = {JINST},
number = 12,
volume = 12,
place = {United States},
year = {2017},
month = {12}
}

Conference:
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