Test beam results of 3D silicon pixel sensors for the ATLAS upgrade Grenier, P.; Alimonti, G.; Barbero, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2011, Letnik:
638, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Results on beam tests of 3D silicon pixel sensors aimed at the ATLAS Insertable B-Layer and High Luminosity LHC (HL-LHC) upgrades are presented. Measurements include charge collection, tracking ...efficiency and charge sharing between pixel cells, as a function of track incident angle, and were performed with and without a 1.6
T magnetic field oriented as the ATLAS inner detector solenoid field. Sensors were bump-bonded to the front-end chip currently used in the ATLAS pixel detector. Full 3D sensors, with electrodes penetrating through the entire wafer thickness and active edge, and double-sided 3D sensors with partially overlapping bias and read-out electrodes were tested and showed comparable performance.
A new pixel front-end integrated circuit is being developed in a 130 nm technology for use in the foreseen b-layer upgrade of the ATLAS pixel detector. Development of this chip is considered as an ...intermediate step towards super-LHC upgrade, and also allows having a smaller radius insertable pixel layer. The higher luminosity for which this chip is tuned implies a complete redefinition of the digital architecture logic with respect to the current ATLAS pixel front-end. The new digital architecture logic is not based on a transfer of all pixel hits to the periphery of the chip, but on local pixel logic, local pixel data storage, and a new mechanism to drain triggered hits from the double-column. An overview of the new chip will be given with particular emphasis on the new digital logic architecture and possible variations. The new interface needed to configure and operate the chip will also be described.
3D-FBK pixel sensors: Recent beam tests results with irradiated devices Micelli, A.; Helle, K.; Sandaker, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2011, Letnik:
650, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Pixel Detector is the innermost part of the ATLAS experiment tracking device at the Large Hadron Collider, and plays a key role in the reconstruction of the primary vertices from the collisions ...and secondary vertices produced by short-lived particles. To cope with the high level of radiation produced during the collider operation, it is planned to add to the present three layers of silicon pixel sensors which constitute the Pixel Detector, an additional layer (Insertable B-Layer, or IBL) of sensors. 3D silicon sensors are one of the technologies which are under study for the IBL. 3D silicon technology is an innovative combination of very-large-scale integration and Micro-Electro-Mechanical-Systems where electrodes are fabricated inside the silicon bulk instead of being implanted on the wafer surfaces. 3D sensors, with electrodes fully or partially penetrating the silicon substrate, are currently fabricated at different processing facilities in Europe and USA. This paper reports on the 2010 June beam test results for irradiated 3D devices produced at FBK (Trento, Italy). The performance of these devices, all bump-bonded with the ATLAS pixel FE-I3 read-out chip, is compared to that observed before irradiation in a previous beam test.
In anticipation of the first LHC data to come, a considerable effort has been devoted to ensure the efficient reconstruction of vertices in the ATLAS detector. This includes the reconstruction of ...photon conversions, long lived particles, secondary vertices in jets as well as finding and fitting of primary vertices. The implementation of the corresponding algorithms requires a modular design based on the use of abstract interfaces and a common Event Data Model. An enhanced software framework addressing various physics applications of vertex reconstruction has been developed in the ATLAS experiment. Presented in this paper are the general principles of this framework. A particular emphasis is given to the description of the concrete implementations, which are dedicated to diverse methods of vertex reconstruction.
Experimental investigations of candidates for hybrid mesons in the VES experiment at the Institute for High Energy Physics (Protvino) are surveyed. The data in question concern {pi}{sub 1}(1400) ...characterized by the exotic quantum numbers of J{sup PC} = 1{sup -+} and observed in the {eta}{pi}{sup -} final state; J{sup PC} 1{sup -+} {pi}{sub 1}(1600) in the {eta}{sup '}{pi}{sup -}, b{sub 1}(1235){pi}, and f{sub 1}(1285){pi}{sup -} final states; and J{sup PC} = 0{sup -+} {pi}(1800) in the f{sub 0}(980){pi}{sup -}, f{sub 0}(1300){pi}{sup -}, f{sub 0}(1500){pi}{sup -}, and a{sub 0}{sup -}(980){eta} final states. New results are given along with data published previously.
The results of a partial wave analysis of 3π system produced in the reaction
π
−
A →
π
+
π
−
π
−
A at the momentum of 36.6 GeV/c on beryllium target are presented. Resonant signals from
a′
1(1750),
a
...3(1860),
a
4(2050) are observed in different channels. Small bump at
M ≈ 1.6GeV in the exotic wave
J
PC
M
η
= 1
−+1
+ is seen. The combined analysis of VES data on this wave in η′π,
b
1(1235)
π and ϱπ channels points to the existence of a hybrid meson with
M ≈ 1.6 GeV.
Particle physics experiments often require the simultaneous reconstruction of many interaction vertices. Usually, this problem is solved by ad hoc heuristic algorithms. We propose a universal ...approach to address the multiple vertex finding through a principled formulation as a minimum-cost lifted multicut problem. The suggested algorithm is tested in a typical LHC environment with multiple proton-proton interaction vertices. Reconstruction errors caused by the particle detectors complicate the solution and require the introduction of special metrics to assess the vertex-finding performance. We demonstrate that the minimum-cost lifted multicut approach outperforms heuristic algorithms and works well up to the highest vertex multiplicity expected at the LHC.
3D-FBK Pixel Sensors: Recent Beam Tests Results with Irradiated Devices Micelli, A.; /INFN, Trieste /Udine U.; Helle, K. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2012, Letnik:
650, Številka:
1
Journal Article
Recenzirano
The Pixel Detector is the innermost part of the ATLAS experiment tracking device at the Large Hadron Collider, and plays a key role in the reconstruction of the primary vertices from the collisions ...and secondary vertices produced by short-lived particles. To cope with the high level of radiation produced during the collider operation, it is planned to add to the present three layers of silicon pixel sensors which constitute the Pixel Detector, an additional layer (Insertable B-Layer, or IBL) of sensors. 3D silicon sensors are one of the technologies which are under study for the IBL. 3D silicon technology is an innovative combination of very-large-scale integration and Micro-Electro-Mechanical-Systems where electrodes are fabricated inside the silicon bulk instead of being implanted on the wafer surfaces. 3D sensors, with electrodes fully or partially penetrating the silicon substrate, are currently fabricated at different processing facilities in Europe and USA. This paper reports on the 2010 June beam test results for irradiated 3D devices produced at FBK (Trento, Italy). The performance of these devices, all bump-bonded with the ATLAS pixel FE-I3 read-out chip, is compared to that observed before irradiation in a previous beam test.
In the harsh environment of the Large Hadron Collider at CERN (design luminosity of 10 34 cm −2 s −1 ) efficient reconstruction of vertices is crucial for many physics analyses. Described in this ...paper are the strategies for vertex reconstruction used in the ATLAS experiment and their implementation in the software framework Athena. The algorithms for the reconstruction of primary and secondary vertices as well as for finding of photon conversions and vertex reconstruction in jets are described. A special emphasis is made on the vertex fitting with application of additional constraints. The implementation of mentioned algorithms follows a very modular design based on object-oriented C++ and use of abstract interfaces. The user-friendly concept allows event reconstruction and physics analyses to compare and optimize their choice among different vertex reconstruction strategies. The performance of implemented algorithms has been studied on a variety of Monte Carlo samples and results are presented.
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