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Master Thesis

Pixel characterization for the MFT upgrade of the ALICE experiment

Abstract : The first collisions from the run II of the Large Hadron Collider (LHC) have started with a p-p energy of 13TeV. By the end of this second run, the initial physics goals of the ALICE experiment will be reached. The foreseen high-luminosity upgrade of the LHC in 2020 will enhance the Pb-Pb collision rate up to 50kHz. In order to fully exploit this future potential, the ALICE collaboration is preparing for a major detector upgrade in 2018. The experiment focuses on the study of strongly interacting matter in extreme conditions of energy and density and in particular the quark gluon plasma (QGP), a new state of matter in which quarks and gluons are no longer bound like in hadrons but can roam freely. The strategy of the collaboration is to extend its physics program for fundamental studies of QCD. This requires high statistics and high precision measurements and will contribute to discriminate between theoretical models. Rare probes play an important part in the physics program and the study of their coupling with the medium and hadronization processes is a major direction in the QGP understanding. The existing Muon spectrometer has produced very interesting results on the production rates of quarkonia and heavy flavor in p-p, Pb-Pb and p-Pb collisions and the second run is expected to deliver even more data. However multiple scattering in its frontal absorber originates a bad spatial resolution on vertices. This results in a high background level in both single muon and dimuon analyses coming from semi-muonic decays of light hadrons and also in limited possibilities to disentangle open charm and open beauty contribution to muon production. To overcome this limitation and to better exploit the unique kinematic range accessible at the LHC by the Muon Spectrometer, the Muon Forward Tracker (MFT) is proposed in the context of the ALICE upgrade plans. Made of 912 pixel silicon sensors in 5 discs surrounding the beampipe, the detector is designed to measure tracks between the interaction point and the frontal absorber in order to be matched with the tracks of the muon spectrometer with an expected resolution lower than 100m. It is foreseen to share the same sensor technology designed for the upgrade of the Inner Tracking System (ITS): ALPIDE which is based on a new silicon pixel technology. This internship focuses on the sensor characterization to optimize the settings in respect to detection efficiency, noise and spatial resolution from the beam test analyse of the latest prototypes.
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Master Thesis
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Submitted on : Wednesday, December 9, 2015 - 9:23:32 AM
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  • HAL Id : dumas-01230455, version 1

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Audrey Francisco. Pixel characterization for the MFT upgrade of the ALICE experiment. High Energy Physics - Phenomenology [hep-ph]. 2015. ⟨dumas-01230455⟩

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