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Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons

Aad, G. and Gray, H. M. and Mateos, D. Lopez and Marshall, Z. and Perez, K. (2010) Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons. European Physical Journal C, 70 (3). pp. 755-785. ISSN 1434-6044. http://resolver.caltech.edu/CaltechAUTHORS:20110208-112827147

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Abstract

The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.8% in the endcaps. This leads to an estimated contribution to the constant term of (0.29^(+0.05)_(−0.04))% in the barrel and (0.54^(+0.06)_(−0.04))% in the endcaps. The same data are used to measure the drift velocity of ionization electrons in liquid argon, which is found to be 4.61±0.07 mm/μs at 88.5 K and 1 kV/mm.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1140/epjc/s10052-010-1403-6DOIUNSPECIFIED
http://www.springerlink.com/content/e215838l5240p291/PublisherUNSPECIFIED
Additional Information:© 2010 CERN for the benefit of the ATLAS collaboration. Received: 22 February 2010; Revised: 7 June 2010; Published online: 23 October 2010. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. We are greatly indebted to all CERN’s departments and to the LHC project for their immense efforts not only in building the LHC, but also for their direct contributions to the construction and installation of the ATLAS detector and its infrastructure. We acknowledge equally warmly all our technical colleagues in the collaborating institutions without whom the ATLAS detector could not have been built. Furthermore we are grateful to all the funding agencies which supported generously the construction and the commissioning of the ATLAS detector and also provided the computing infrastructure. The ATLAS detector design and construction has taken about fifteen years, and our thoughts are with all our colleagues who sadly could not see its final realization. We acknowledge the support of ANPCyT, Argentina; Yerevan Physics Institute, Armenia; ARC and DEST, Australia; Bundesministerium fürWissenschaft und Forschung, Austria; National Academy of Sciences of Azerbaijan; State Committee on Science & Technologies of the Republic of Belarus; CNPq and FINEP, Brazil; NSERC, NRC, and CFI, Canada; CERN; NSFC, China; Ministry of Education, Youth and Sports of the Czech Republic, Ministry of Industry and Trade of the Czech Republic, and Committee for Collaboration of the Czech Republic with CERN; Danish Natural Science Research Council; European Commission, through the ARTEMIS Research Training Network; IN2P3-CNRS and Dapnia-CEA, France; Georgian Academy of Sciences; BMBF, DESY, DFG and MPG, Germany; Ministry of Education and Religion, through the EPEAEK program PYTHAGORAS II and GSRT, Greece; ISF, MINERVA, GIF, DIP, and Benoziyo Center, Israel; INFN, Italy; MEXT, Japan; CNRST, Morocco; FOM and NWO, Netherlands; The Research Council of Norway; Ministry of Science and Higher Education, Poland; GRICES and FCT, Portugal; Ministry of Education and Research, Romania; Ministry of Education and Science of the Russian Federation, Russian Federal Agency of Science and Innovations, and Russian Federal Agency of Atomic Energy; JINR; Ministry of Science, Serbia; Department of International Science and Technology Cooperation, Ministry of Education of the Slovak Republic; Slovenian Research Agency, Ministry of Higher Education, Science and Technology, Slovenia; Ministerio de Educación y Ciencia, Spain; The Swedish Research Council, The Knut and Alice Wallenberg Foundation, Sweden; State Secretariat for Education and Science, Swiss National Science Foundation, and Cantons of Bern and Geneva, Switzerland; National Science Council, Taiwan; TAEK, Turkey; The Science and Technology Facilities Council and The Leverhulme Trust, United Kingdom; DOE and NSF, United States of America.
Funders:
Funding AgencyGrant Number
ANPCyT (Argentina)UNSPECIFIED
Yerevan Physics Institute (Armenia)UNSPECIFIED
ARC (Australia)UNSPECIFIED
DEST (Australia)UNSPECIFIED
Bundesministerium für Wissenschaft und Forschung (Austria)UNSPECIFIED
National Academy of Sciences of Azerbaijan UNSPECIFIED
State Committee on Science & Technologies of the Republic of BelarusUNSPECIFIED
CNPq (Brazil)UNSPECIFIED
FINEP (Brazil)UNSPECIFIED
NSERC (Canada)UNSPECIFIED
NRC (Canada)UNSPECIFIED
CFI (Canada)UNSPECIFIED
CERNUNSPECIFIED
NSFC (China)UNSPECIFIED
Ministry of Education, Youth and Sports of the Czech RepublicUNSPECIFIED
Ministry of Industry and Trade of the Czech RepublicUNSPECIFIED
Committee for Collaboration of the Czech Republic with CERNUNSPECIFIED
Danish Natural Science Research CouncilUNSPECIFIED
European Commission, through the ARTEMIS Research Training NetworkUNSPECIFIED
CNRS/IN2P3 (France)UNSPECIFIED
CEA/DAPNIA (France)UNSPECIFIED
Georgian Academy of SciencesUNSPECIFIED
BMBF (Germany)UNSPECIFIED
DESY (Germany)UNSPECIFIED
DFG (Germany)UNSPECIFIED
MPG (Germany)UNSPECIFIED
Ministry of Education and Religion, through the EPEAEK program PYTHAGORAS II (Greece)UNSPECIFIED
GSRT (Greece)UNSPECIFIED
ISF (Israel)UNSPECIFIED
MINERVA (Israel)UNSPECIFIED
GIF (Israel)UNSPECIFIED
DIP (Israel)UNSPECIFIED
Benoziyo Center (Israel)UNSPECIFIED
INFN (Italy)UNSPECIFIED
MEXT (Japan)UNSPECIFIED
CNRST (Morocco)UNSPECIFIED
FOM (The Netherlands)UNSPECIFIED
NWO (Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Science and Higher Education (Poland)UNSPECIFIED
GRICES (Portugal)UNSPECIFIED
FCT (Portugal)UNSPECIFIED
Ministry of Education and Research (Romania)UNSPECIFIED
Ministry of Education and Science of the Russian Federation (Russia)UNSPECIFIED
Russian Federal Agency of Science and InnovationsUNSPECIFIED
Russian Federal Agency of Atomic EnergyUNSPECIFIED
JINR UNSPECIFIED
Ministry of Science (Serbia)UNSPECIFIED
Department of International Science and Technology Cooperation UNSPECIFIED
Ministry of Education of the Slovak RepublicUNSPECIFIED
Slovenian Research AgencyUNSPECIFIED
Ministry of Higher Education, Science and Technology (Slovenia)UNSPECIFIED
Ministerio de Educación y Ciencia (Spain)UNSPECIFIED
Swedish Research CouncilUNSPECIFIED
Knut and Alice Wallenberg foundation UNSPECIFIED
State Secretariat for Education and Science (Switzerland)UNSPECIFIED
Swiss National Science FoundationUNSPECIFIED
Cantons of Bern and Geneva, SwitzerlandUNSPECIFIED
National Science Council (Taiwan)UNSPECIFIED
TAEK (Turkey)UNSPECIFIED
Science and Technology Facilities Council (UK)UNSPECIFIED
Leverhulme Trust (UK)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Record Number:CaltechAUTHORS:20110208-112827147
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110208-112827147
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22078
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:08 Feb 2011 23:11
Last Modified:26 Dec 2012 12:54

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