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Licentiate Thesis: ATLAS pixel detector readout integrated circuits and data acquisition
  Thesis defense

Monday 19 September 2016
from 09:30 to 11:30
at B4:1059
Speaker : Veronica Wallängen (Stockholm University, Department of Physics)
Abstract : The Large Hadron Collider (LHC) is a particle collider built by the European Organization for Nuclear Research (CERN) for testing the predictions of theories within high energy physics and related fields, thereby contributing to advancements in our understanding of physical laws. In order to improve the discovery potential by increasing the probability for rare events of interest, such as Higgs boson formation, the LHC will undergo an upgrade to reach luminosities of 5E34 cm2/s and the new machine, the so-called High Luminosity LHC, is planned to be ready for operation around 2025. The functionality of the LHC and the experiments installed around its circumference depends on highly advanced instrumentation and with regards to the hardware in the ATLAS experiment, the increased collision rate and radiation exposure following from the upgrade facilitates the need for a new detector readout system that can meet the demands on low-mass, high-speed readout capability and radiation tolerance, especially for the pixel detector, which is the subsystem closest to the particle interaction point. This work describes the preparation of the ATLAS pixel detector for the phase 2 inner tracker upgrade, in the form of testing and verification of new readout techniques and recently developed pixel chip prototypes, as well as characterization and simulation of a data transmission link for high-speed readout of the pixel front-ends. The outcome of these studies is promising, as initial results indicate that the new readout schemes as well as pixel chip prototypes are well-functioning and that a correctly designed high-speed data transmission link can reach the desired data rates of 5 Gbps while meeting the other challenging demands of the new system. Equally as important as the development of improved readout electronics for an upgraded system is the maintenance and integrity checking of the present particle detector, as well as for rigorous simulations to be carried out with great detail and accuracy, taking into account all effects which impact the detector functionality, in order to understand the performance of the machine. Thus, in addition to ATLAS phase 2 upgrade activities, this thesis covers work related to the simulation of radiation damage effects in the pixel sensors, and the update of a test bench system for maintenance of one of the calorimeters of the ATLAS experiment.

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