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Modeling Radiation Damage Effects in 3D Pixel Digitization for the ATLAS Detector
Stockholm University, Faculty of Science, Department of Physics. Lawrence Berkeley National Laboratory, USA.
2018 (English)In: The 26th International Workshop on Vertex Detectors, Trieste: SISSA, the International School for Advanced Studies , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Silicon Pixel detectors are at the core of the current and planned upgrade of the ATLAS detector. As the detector in closest proximity to the interaction point, these detectors will be exposed to a significant amount of radiation over their lifetime: before the High Luminosity phase of the Large Hadron Collider (HL-LHC) the innermost layers will receive a fluence in excess of 1015 neq/cm2 and the HL-LHC detector upgrades must cope with an order of magnitude higher fluence integrated over their lifetimes. This work presents the details of a new simulation model that includes radiation damage effects to the 3D Pixel sensors for the ATLAS detector.

Place, publisher, year, edition, pages
Trieste: SISSA, the International School for Advanced Studies , 2018.
Series
PoS - Proceedings of Science, E-ISSN 1824-8039 ; 309
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-174834DOI: 10.22323/1.309.0050OAI: oai:DiVA.org:su-174834DiVA, id: diva2:1360492
Conference
The 26th International Workshop on Vertex Detectors, Las Caldas, Asturias, Spain, 10-15 September, 2017
Note

Veronica Wallängen, on behalf of the ATLAS Collaboration.

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-11-01Bibliographically approved
In thesis
1. Performance Improvements for Particle Tracking Detectors in Extreme Rate and Radiation Environments
Open this publication in new window or tab >>Performance Improvements for Particle Tracking Detectors in Extreme Rate and Radiation Environments
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In order to increase its discovery potential, the Large Hadron Collider (LHC) at CERN is being transformed into a higher luminosity machine expected to be operational around 2026. The number of particle collisions will increase by a factor of 10 beyond the current design value, which means that the detectors installed around the LHC are facing various new challenges. The most demanding challenges include handling the enormous data quantities that will be transferred from the front-end readout modules at significantly higher rates than previously, as well as the radiation effects that arise as a consequence of the intense particle flow and that cause damage to sensor elements and electronics.

At the ATLAS experiment, a multipurpose detector operating at the LHC, the impact of the luminosity increase is especially severe for the silicon pixel tracking detector, being the central subsystem located closest to the particle interaction point and therefore exposed to the highest radiation dose and hit density. The extreme radiation doses that the pixel modules will be subject to will cause deformation of the sensor material structure and thus loss of the signals, which after subsequent digitization by the pixel readout chip must be transferred over relatively long distances through a low-mass data link, causing further signal distortion.

The work presented here addresses both major challenges described and outlines solutions for the upcoming upgrade of the ATLAS pixel detector system with regards to these. Firstly, it is demonstrated how improved accuracy of detector simulations and reconstruction of particle trajectories through the detector can be achieved as higher particle fluences are approached, by modeling radiation damage effects that occur in the pixel sensors. Secondly, it is shown how a receiver integrated circuit utilizing an industry standard technique novel within high-energy physics applications has been designed as an integral part of a high-speed transmission link to efficiently restore the signal quality in order to achieve adequate data readout rates.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2019. p. 99
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-175161 (URN)978-91-7797-909-8 (ISBN)978-91-7797-910-4 (ISBN)
Public defence
2019-11-29, sal FB54, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2019-11-06 Created: 2019-10-15 Last updated: 2019-11-01Bibliographically approved

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