Cuevas Bautista, Juan C.

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    Robustness studies of the cms tracker for the lhc upgrade phase i
    (2013) Cuevas Bautista, Juan C.; Méndez Mella, Héctor; College of Arts and Science - Science; Santana-Colón, Samuel A.; Ramírez Vargas, Juan Eduardo; Department of Physics; Santana, Alberto
    Currently, several changes are being implemented in the tracker geometry of the Compact Muon Solenoid (CMS). These should improve the performance of both strip and pixel detectors. The new pixel detector will have four barrel pixel layers and three disks in the ends, compared to the current configuration of three barrel pixel layers and two disks in the ends. Also the material used to make these additional layers and disks has been reduced, yielding a lighter pixel detector and therefore, reduces the interaction of particles with the inactive material in the tracker. All these improvements are included in the CMS software (CMSSW) that simulates the response of the detector in scenarios such as increased luminosity in the Large Hadron Collider (LHC) for the period known as Phase 1 upgrade. In this thesis, I perform some studies to show the robustness of the upgraded detector with respect to the present detector. These studies consider two scenarios with inefficiencies in the outer tracker; degradation of the first two silicon TIB layers (which are those closer to the pixel detector), and failures in some tracker modules of the outer tracker (Tracker Inner Barrel (TIB), Tracker Outer Barrel (TOB) and Tracker Inner Disk (TID)) that are believed to possibly become unstable at increasing luminosity. Finally, we study a third scenario which shows the preliminary results of a new method for simulating radiation damage on the first layer of the pixel detector. In the first study, the degradation of the TIB is simulated due to radiation damage with a 20% uniform inefficiency in the first two TIB layers. In the second, the degradation in the outer tracker is simulated by switching off a group of selected tracker modules that could become unstable at high luminosities. Then, a new method to simulate radiation damage on the pixel detector is done through decreasing and increasing exponential functions. Next, the specifications of the new detector geometry are introduced (e.g an additional fourth barrel pixel layer) for measuring the impact of high pile-up scenarios corresponding to an increased luminosity after the Phase 1 upgrade (SLHC), thus providing feedback on the design of future CMS upgrade tracker geometries and detectors.