-
E Abat,
J M Abdallah,
T N Addy,
P Adragna,
M Aharrouche,
A Ahmad,
T P A Akesson,
M Aleksa,
C Alexa,
K Anderson, [......],
H H Williams,
I Wingerter-Seez,
Y Yasu,
A Zaitsev,
A Zenin,
T Zenis,
Z Zenonos,
H Zhang,
A Zhelezko,
N Zhou
[show abstract]
[hide abstract]
ABSTRACT: The reconstruction of photons in the ATLAS detector is studied with data taken during the 2004 Combined Test Beam, where a full slice of the ATLAS detector was exposed to beams of particles of known energy at the CERN SPS. The results presented show significant differences in the longitudinal development of the electromagnetic shower between converted and unconverted photons as well as in the total measured energy. The potential to use the reconstructed converted photons as a means to precisely map the material of the tracker in front of the electromagnetic calorimeter is also considered. All results obtained are compared with a detailed Monte-Carlo simulation of the test-beam setup which is based on the same simulation and reconstruction tools as those used for the ATLAS detector itself.
Journal of Instrumentation 03/2011; 6(04):P04001. · 1.87 Impact Factor
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E. Abat,
J.M. Abdallah,
T.N. Addy,
P. Adragna,
M. Aharrouche,
A Ahmad,
T.P.A. Akesson,
M. Aleksa,
C. Alexa,
K Anderson, [......],
H. H. Williams,
I Wingerter-Seez,
Y. Yasu,
A Zaitsev,
A. Zenin,
T. Zenis,
Z. Zenonos,
H Zhang,
A. Zhelezko,
N Zhou
[show abstract]
[hide abstract]
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 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.
12/2010;
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A Ahmad,
A Andreazza,
T Atkinson,
J Baines,
A J Barr,
R Beccherle,
P J Bell,
J Bernabeu, Z Broklova,
P A Bruckman de Renstrom, [......],
F Vernocchi,
J Virzi,
T Vu Anh,
M Warren,
J Weber,
M Weber,
A R Weidberg,
J Weingarten,
P S Wells,
A Zhelezko
[show abstract]
[hide abstract]
ABSTRACT: A small set of final prototypes of the ATLAS Inner Detector silicon tracking system (Pixel Detector and SemiConductor Tracker), were used to take data during the 2004 Combined Test Beam. Data were collected from runs with beams of different flavour (electrons, pions, muons and photons) with a momentum range of 2 to 180 GeV/c. Four independent methods were used to align the silicon modules. The corrections obtained were validated using the known momenta of the beam particles and were shown to yield consistent results among the different alignment approaches. From the residual distributions, it is concluded that the precision attained in the alignment of the silicon modules is of the order of 5 μm in their most precise coordinate.
Journal of Instrumentation 09/2008; 3(09):P09004. · 1.87 Impact Factor
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E Abat,
A Abdesselam,
T N Addy,
T P A Åkesson,
P P Allport,
L Andricek,
F Anghinolfi,
R Apsimon,
E Arik,
M Arik, [......],
D Whittington,
A Wildauer,
I Wilhelm,
H H Williams,
J A Wilson,
M W Wolter,
S L Wu,
A Zhelezko,
H Z Zhu,
A Zsenei
[show abstract]
[hide abstract]
ABSTRACT: The ATLAS (A Toroidal LHC ApparatuS) Inner Detector provides charged particle tracking in the centre of the ATLAS experiment at the Large Hadron Collider (LHC). The Inner Detector consists of three subdetectors: the Pixel Detector, the Semiconductor Tracker (SCT), and the Transition Radiation Tracker (TRT). This paper summarizes the tests that were carried out at the final stage of SCT+TRT integration prior to their installation in ATLAS. The combined operation and performance of the SCT and TRT barrel and endcap detectors was investigated through a series of noise tests, and by recording the tracks of cosmic rays. This was a crucial test of hardware and software of the combined tracker detector systems. The results of noise and cross-talk tests on the SCT and TRT in their final assembled configuration, using final readout and supply hardware and software, are reported. The reconstruction and analysis of the recorded cosmic tracks allowed testing of the offline analysis chain and verification of basic tracker performance parameters, such as efficiency and spatial resolution, in combined operation before installation.
Journal of Instrumentation 08/2008; 3(08):P08003. · 1.87 Impact Factor
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A Ahmad,
A Andreazza,
T. Atkinson,
J Baines,
A.J. Barr,
R. Beccherle,
P J Bell,
J. Bernabeu, Z Broklova,
P.A. Bruckman De Renstrom, [......],
F. Vernocchi,
J. Virzi,
T Vu Anh,
M. Warren,
J Weber,
M Weber,
A R Weidberg,
J. Weingarten,
P S Wells,
A. Zhelezko
[show abstract]
[hide abstract]
ABSTRACT: A small set of final prototypes of the ATLAS Inner Detector silicon tracker (Pixel and SCT) were used to take data during the 2004 Combined Test Beam. Data were collected from runs with beams of different flavour (electrons, pions, muons and photons) with a momentum range of 2 to 180 GeV/c. Four independent methods were used to align the silicon modules. The corrections obtained were validated using the known momenta of the beam particles and were shown to yield consistent results among the different alignment approaches. From the residual distributions, it is concluded that the precision attained in the alignment of the silicon modules is of the order of 5 micrometers in their most precise coordinate. Comment: 22 pages, submitted to JINST, 129 authors
05/2008;
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A. Abdesselam,
P. J. Adkin,
P P Allport,
J Alonso,
L. Andricek,
F. Anghinolfi,
A. A. Antonov,
R J Apsimon,
T. Atkinson,
L. E. Batchelor, [......],
M J Goodrick,
T.I. Hollins,
H Becker,
P Johansson,
A A Carter,
J Blocki,
A Cheplakov,
A. Gorisek,
J. P. Matheson,
Y. Unno
[show abstract]
[hide abstract]
ABSTRACT: 37 pages, 43 figures.-- PACS nrs.: 29.40.Gx; 29.40.Wk.-- ISI Article Identifier: 000247146800010.-- Printed version published on Jun 1, 2007. The challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS Semiconductor Tracker (SCT) end-caps have a total of about 3 million electronics channels each reading out every 25 ns into its own on-chip 3.3 μs buffer. The highest anticipated dose after 10 years operation is 1.4x10(14) cm(-2) in units of 1 MeV neutron equivalent (assuming the damage factors scale with the non-ionising energy loss). The forward tracker has 1976 double-sided modules, mostly of area similar to 70 cm(2), each having 2 x 768 strips read out by six ASICs per side. The requirement to achieve an average perpendicular radiation length of 1.5% X-0, while coping with up to 7 W dissipation per module (after irradiation), leads to stringent constraints on the thermal design. The additional requirement of 1500e(-) equivalent noise charge (ENC) rising to only 1800e(-) ENC after irradiation, provides stringent design constraints on both the high-density Cu/Polyimide flex read-out circuit and the ABCD3TA read-out ASICs. Finally, the accuracy of module assembly must not compromise the 16 μm (rΦ) resolution perpendicular to the strip directions or 580 μm radial resolution coming from the 40 mrad front-back stereo angle. A total of 2210 modules were built to the tight tolerances and specifications required for the SCT. This was 234 more than the 1976 required and represents a yield of 93%. The component flow was at times tight, but the module production rate of 40-50 per week was maintained despite this. The distributed production was not found to be a major logistical problem and it allowed additional flexibility to take advantage of where the effort was available, including any spare capacity, for building the end-cap modules. The collaboration that produced the ATLAS SCT end-cap modules kept in close contact at all times so that the effects of shortages or stoppages at different sites could be rapidly resolved. We acknowledge the support of the funding authorities of the collaborating institutes including the Spanish National Programme for Particle Physics; the Research Council of Norway; the Particle Physics and Astronomy Research Council of the United Kingdom; the Polish Ministry of Education and Science; the German Ministry of Science; the Swiss National Science Foundation; the State Secretariat for Education and Research and the Canton of Geneva; the Slovenian Research Agency and the Ministry of Higher Education, Science and Technology of the Republic of Slovenia; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Japan Society for the Promotion of Science; the Office of High Energy Physics of the United States Department of Energy; the United States National Science Foundation; the Australian Department of Education, Science and Training; Dutch Foundation for Fundamental Research on Matter (FOM); the Ministry of Education, Youth and Sports of the Czech Republic; the National Science Council, Taiwan; the Swedish Research Council. The Research was supported in part by the EU under RTN Contract HPRN-CT-2002-00292 Probe for New Physics within the Sixth European Community Framework Programme. Peer reviewed
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F. Campabadal,
C Fleta,
M Key,
M Lozano,
C Martinez,
G Pellegrini,
J.M. Rafi,
M. Ullan,
L.G. Johansen,
B Mohn, [......],
C Garcia,
J.E. Garcia Navarro,
S. Gonzalez-Sevilla,
C Lacasta,
G. Llosa,
S. Marti-Garcia,
P Modesto,
F. J. Sanchez,
L Sospedra,
M Vos
[show abstract]
[hide abstract]
ABSTRACT: The ABCD3TA is a 128-channel ASIC with binary architecture for the readout of silicon strip particle detectors in the Semiconductor Tracker of the ATLAS experiment at the Large Hadron Collider (LHC). The chip comprises fast front-end and amplitude discriminator circuits using bipolar devices, a binary pipeline for first level trigger latency, a second level derandomising buffer and data compression circuitry based on CMOS devices. It has been designed and fabricated in a BiCMOS radiation resistant process. Extensive testing of the ABCD3TA chips assembled into detector modules show that the design meets the specifications and maintains the required performance after irradiation up to a total ionising dose of 10 Mrad and a 1-MeV neutron equivalent fluence of 2×1014 n/cm2, corresponding to 10 years of operation of the LHC at its design luminosity. Wafer screening and quality assurance procedures have been developed and implemented in large volume production to ensure that the chips assembled into modules meet the rigorous acceptance criteria.
Nuclear Physics fields.
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A. Abdesselam,
P P Allport,
C. Anastopoulos,
B Anderson,
L. Andricek,
F. Anghinolfi,
R Apsimon,
T. Atkinson,
D. J. Attree,
N. Austin, [......],
P Werneke,
M.J. White,
M Wiesmann,
I Wilhelm,
I Wilmut,
J A Wilson,
M.W. Wolter,
S L Wu,
H. Z. Zhu,
A Zsenei
[show abstract]
[hide abstract]
ABSTRACT: The ATLAS SemiConductor Tracker (SCT) was built in three sections: a barrel and two end-caps. This paper describes the design, construction and final integration of the barrel section. The barrel is constructed around four nested cylinders that provide a stable and accurate support structure for the 2112 silicon modules and their associated services. The emphasis of this paper is directed at the aspects of engineering design that turned a concept into a fully-functioning detector, as well as the integration and testing of large sub-sections of the final SCT barrel detector. The paper follows the chronology of the construction. The main steps of the assembly are described with the results of intermediate tests. The barrel service components were developed and fabricated in parallel so that a flow of detector modules, cooling loops, opto-harnesses and Frequency-Scanning-Interferometry (FSI) alignment structures could be assembled onto the four cylinders. Once finished, each cylinder was conveyed to the next site for the mounting of modules to form a complete single barrel. Extensive electrical and thermal function tests were carried out on the completed single barrels. In the next stage, the four single barrels and thermal enclosures were combined into the complete SCT barrel detector so that it could be integrated with the Transition Radiation Tracker (TRT) barrel to form the central part of the ATLAS inner detector. Finally, the completed SCT barrel was tested together with the TRT barrel in noise tests and using cosmic rays.
-
A. Abdesselam,
PP Allport,
C. Anastopoulos,
B Anderson,
L. Andricek,
F. Anghinolfi,
R Apsimon,
T. Atkinson,
DJ Attree,
N. Austin, [......],
P Werneke,
MJ White,
M Wiesmann,
I Wilhelm,
I Wilmut,
JA Wilson,
MW Wolter,
SL Wu,
HZ Zhu,
A Zsenei
-
G. Aad,
E. Abat,
J Abdallah,
AA Abdelalim,
A. Abdesselam,
O. Abdinov,
BA Abi,
M Abolins,
H Abramowicz,
E. Acerbi, [......],
G. Unel,
Y. Unno,
E. Urkovsky,
G. Usai,
Y. Usov,
L Vacavant,
V Vacek,
B Vachon,
S. Vahsen,
C. Valderanis
-
E Abate,
A. Abdesselam,
TN Addy,
TPA Akesson,
PP Allport,
L. Andricek,
F. Anghinolfi,
R Apsimon,
E Arik,
M. Arik, [......],
D. Whittington,
A. Wildauer,
I Wilhelm,
HH Williams,
JA Wilson,
MW Wolter,
SL Wu,
A. Zhelezko,
HZ Zhu,
A Zsenei
-
A. Abdesselam,
T Akimoto,
PP Allport,
J Alonso,
B Anderson,
L. Andricek,
F. Anghinolfi,
RJ Apsimon,
G. Barbier,
AJ Barr, [......],
MRM Warren,
RL Wastie,
M Weber,
AR Weidberg,
P Weilhammer,
PS Wells,
M. Wilder,
I Wilhelm,
JA Wilson,
M Wolter
-
A. Abdesselam,
PJ Adkin,
PP Allport,
J Alonso,
L. Andricek,
F. Anghinolfi,
AA Antonov,
RJ Apsimon,
T. Atkinson,
LE Batchelor, [......],
JA Wilson,
J. Winton,
M Wolter,
MP Wormald,
SL Wu,
X Wu,
H Zhu,
N Bingefors,
R Brenner,
T Ekelof
-
E. Abat,
J.M. Abdallah,
T.N. Addy,
P. Adragna,
M. Aharrouche,
A Ahmad,
T.P.A. Akesson,
M. Aleksa,
C. Alexa,
K Anderson, [......],
H. H. Williams,
I Wingerter-Seez,
Y. Yasu,
A Zaitsev,
A. Zenin,
T. Zenis,
Z. Zenonos,
H Zhang,
A. Zhelezko,
N Zhou
Journal of Instrumentation.
-
E. Abat,
J.M. Abdallah,
T.N. Addy,
P. Adragna,
M. Aharrouche,
A Ahmad,
T.P.A. Akesson,
M. Aleksa,
C. Alexa,
K Anderson, [......],
G Marchiori,
I. Nikolic-Audit,
J Ocariz,
M. Ridel,
L Roos,
Ph. Schwemling,
T. Theveneaux-Pelzer,
S Trincaz-Duvoid,
T.N. Trinh,
F. Vannucci
-
E. Abat,
JM Abdallah,
TN Addy,
P. Adragna,
M. Aharrouche,
A Ahmad,
TPA Akesson,
M. Aleksa,
C. Alexa,
K Anderson, [......],
HH Williams,
I Wingerter-Seez,
Y. Yasu,
A Zaitsev,
A. Zenin,
T. Zenis,
Z. Zenonos,
H Zhang,
A. Zhelezko,
N Zhou
-
A. Abdesselam,
T. Akimoto,
P.P. Allport,
J. Alonso,
B. Anderson,
L. Andricek,
F. Anghinolfi,
R.J. Apsimon,
G. Barbier,
A.J. Barr, [......],
M.R.M. Warren,
R.L. Wastie,
M. Weber,
A.R. Weidberg,
P. Weilhammer,
P.S. Wells,
M. Wilder,
I. Wilhelm,
J.A. Wilson,
M. Wolter
[show abstract]
[hide abstract]
ABSTRACT: This paper describes the silicon microstrip modules in the barrel section of the SemiConductor Tracker (SCT) of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The module requirements, components and assembly techniques are given, as well as first results of the module performance on the fully assembled barrels that make up the detector being installed in the ATLAS experiment.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 568(2):642-671. · 1.21 Impact Factor
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F. Campabadal,
C Fleta,
MH Key,
M Lozano,
C Martinez,
G Pellegrini,
JM Rafi,
M. Ullan,
L Johansen,
B Pommeresche, [......],
G. Llosa,
S. Marti-Garcia,
P Modesto,
J Sanchez,
L Sospedra,
M Vos,
D Fasching,
S Gonzalez,
RC Jared,
E Charles
-
F. Campabadal,
C. Fleta,
M. Key,
M. Lozano,
C. Martinez,
G. Pellegrini,
J.M. Rafi,
M. Ullan,
L.G. Johansen,
B. Mohn, [......],
C. Garcia,
J.E. Garcia-Navarro,
S. Gonzalez-Sevilla,
C. Lacasta,
G. Llosa,
S. Marti-Garcia,
P. Modesto,
F.J. Sanchez,
L. Sospedra,
M. Vos
[show abstract]
[hide abstract]
ABSTRACT: The ABCD3TA is a 128-channel ASIC with binary architecture for the readout of silicon strip particle detectors in the Semiconductor Tracker of the ATLAS experiment at the Large Hadron Collider (LHC). The chip comprises fast front-end and amplitude discriminator circuits using bipolar devices, a binary pipeline for first level trigger latency, a second level derandomising buffer and data compression circuitry based on CMOS devices. It has been designed and fabricated in a BiCMOS radiation resistant process. Extensive testing of the ABCD3TA chips assembled into detector modules show that the design meets the specifications and maintains the required performance after irradiation up to a total ionising dose of 10 Mrad and a 1-MeV neutron equivalent fluence of 2×1014 n/cm2, corresponding to 10 years of operation of the LHC at its design luminosity. Wafer screening and quality assurance procedures have been developed and implemented in large volume production to ensure that the chips assembled into modules meet the rigorous acceptance criteria.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
