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Production and Integration of the ATLAS Insertable B-Layer
Authors:
B. Abbott,
J. Albert,
F. Alberti,
M. Alex,
G. Alimonti,
S. Alkire,
P. Allport,
S. Altenheiner,
L. Ancu,
E. Anderssen,
A. Andreani,
A. Andreazza,
B. Axen,
J. Arguin,
M. Backhaus,
G. Balbi,
J. Ballansat,
M. Barbero,
G. Barbier,
A. Bassalat,
R. Bates,
P. Baudin,
M. Battaglia,
T. Beau,
R. Beccherle
, et al. (352 additional authors not shown)
Abstract:
During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, smaller radius beam pipe. The motivation for this new pixel layer, the Insertable B-Layer (IBL), was to maintain or improve the robustness and performance of the ATLAS tracking system, given the higher instantaneous and i…
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During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, smaller radius beam pipe. The motivation for this new pixel layer, the Insertable B-Layer (IBL), was to maintain or improve the robustness and performance of the ATLAS tracking system, given the higher instantaneous and integrated luminosities realised following the shutdown. Because of the extreme radiation and collision rate environment, several new radiation-tolerant sensor and electronic technologies were utilised for this layer. This paper reports on the IBL construction and integration prior to its operation in the ATLAS detector.
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Submitted 6 June, 2018; v1 submitted 2 March, 2018;
originally announced March 2018.
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A Combine On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyzer for The ATLAS Silicon Tracker
Authors:
A. Bitadze,
R. Bates,
M. Battistin,
S. Berry,
P. Bonneau,
J. Botelho-Direito,
B. DiGirolamo,
J. Godlewski,
E. Perez-Rodriguez,
L. Zwalinski,
N. Bousson,
G. Hallewell,
M. Mathieu,
A. Rozanov,
G. Boyd,
M. Doubek,
V. Vacek,
M. Vitek,
K. Egorov,
S. Katunin,
S. McMahon,
K. Nagai
Abstract:
An upgrade to the ATLAS silicon tracker cooling control system may require a change from C3F8 (octafluoro-propane) to a blend containing 10-30% of C2F6 (hexafluoro-ethane) to reduce the evaporation temperature and better protect the silicon from cumulative radiation damage with increasing LHC luminosity. Central to this upgrade is a new acoustic instrument for the real-time measurement of the C3F8…
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An upgrade to the ATLAS silicon tracker cooling control system may require a change from C3F8 (octafluoro-propane) to a blend containing 10-30% of C2F6 (hexafluoro-ethane) to reduce the evaporation temperature and better protect the silicon from cumulative radiation damage with increasing LHC luminosity. Central to this upgrade is a new acoustic instrument for the real-time measurement of the C3F8/C2F6 mixture ratio and flow. The instrument and its Supervisory, Control and Data Acquisition (SCADA) software are described in this paper. The instrument has demonstrated a resolution of 3.10-3 for C3F8/C2F6 mixtures with ~20%C2F6, and flow resolution of 2% of full scale for mass flows up to 30gs-1. In mixtures of widely-differing molecular weight (mw), higher mixture precision is possible: a sensitivity of < 5.10-4 to leaks of C3F8 into the ATLAS pixel detector nitrogen envelope (mw difference 160) has been seen. The instrument has many potential applications, including the analysis of mixtures of hydrocarbons, vapours for semi-conductor manufacture and anaesthesia.
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Submitted 12 January, 2012;
originally announced January 2012.
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A Layer Correlation technique for pion energy calibration at the 2004 ATLAS Combined Beam Test
Authors:
E. Abat,
J. M. Abdallah,
T. N. Addy,
P. Adragna,
M. Aharrouche,
A. Ahmad,
T. P. A. Akesson,
M. Aleksa,
C. Alexa,
K. Anderson,
A. Andreazza,
F. Anghinolfi,
A. Antonaki,
G. Arabidze,
E. Arik,
T. Atkinson,
J. Baines,
O. K. Baker,
D. Banfi,
S. Baron,
A. J. Barr,
R. Beccherle,
H. P. Beck,
B. Belhorma,
P. J. Bell
, et al. (460 additional authors not shown)
Abstract:
A new method for calibrating the hadron response of a segmented calorimeter is developed and successfully applied to beam test data. It is based on a principal component analysis of energy deposits in the calorimeter layers, exploiting longitudinal shower development information to improve the measured energy resolution. Corrections for invisible hadronic energy and energy lost in dead material in…
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A new method for calibrating the hadron response of a segmented calorimeter is developed and successfully applied to beam test data. It is based on a principal component analysis of energy deposits in the calorimeter layers, exploiting longitudinal shower development information to improve the measured energy resolution. Corrections for invisible hadronic energy and energy lost in dead material in front of and between the calorimeters of the ATLAS experiment were calculated with simulated Geant4 Monte Carlo events and used to reconstruct the energy of pions impinging on the calorimeters during the 2004 Barrel Combined Beam Test at the CERN H8 area. For pion beams with energies between 20 GeV and 180 GeV, the particle energy is reconstructed within 3% and the energy resolution is improved by between 11% and 25% compared to the resolution at the electromagnetic scale.
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Submitted 12 May, 2011; v1 submitted 20 December, 2010;
originally announced December 2010.