Siado Castañeda, Joaquin E.

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Radiation tolerance and signal risetime of the cms pixel detector
(2013) Siado Castañeda, Joaquin E.; López Berríos, Ángel M.; College of Arts and Science - Science; Roura Davila, Erick; Ramírez Vargas, Juan Eduardo; Department of Physics; Quiñones, Carlos
The Compact Muon Solenoid (CMS) is one of the main experiments at the large hadron collider (LHC). This thesis presents the study of two important features of the CMS pixel detector. The first study shows the performance of the present sensor technology as a function of the irradiation levels comparable to those expected at an upgraded LHC. Thus, it establishes a reference point for the lifetime of the detector. The study also shows changes in the operation voltage of the detector as a function of the irradiation levels. Pixels were irradiated using positive protons of 2.6 MeV and tested using a Sr-90 source. The second study refers to the timing response of the pixels when a signal passes through them. As the bunch crossing time in the LHC is 25 ns, pixels have to send their data on time to avoid information loss. The study shows the timing response as a function of the irradiation levels as well as the geometric location of the pixels in the array. To measure this time a new technique was developed which resulted in greater precision.