Hautes Energies
Upgrade of the ALICE Inner Tracking System.
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Europe/Paris
Salle Mondrian, bat 25.
Description
ALICE (A Large Ion Collider Experiment) is one of the four main experiments at LHC. It is designed to address the physics of strongly interacting matter, and in particular the properties of the Quark Gluon Plasma (QGP), using nucleus-nucleus collisions at high energies. This study relies on the complex analysis of different physical observables. Thus a sophisticated detector is needed to perform the necessary measurements. Inner Tracking System (ITS) is located in the core of the experimental setup and consists of six cylindrical layers of silicon detectors. The system provides a precise determination of the primary and secondary vertices of the events, complements the tracking performed by the Time Projection Chamber (TPC) and completes the particle identification performed by the other detectors. Information provided by the ITS is extremely important for the reconstruction of the heavy flavor particles like charmed and beauty hadrons. The current performance of the ITS and corresponding physics results will be addressed in the first part of the seminar.
In 2011 ALICE collaboration started to consider a global strategy for the future detector upgrade. According to this strategy the main objective of the ALICE upgrade is to extend physics reach of the experiment by increasing the number of accessible physics channels. ALICE should also be adapted to the higher interaction rates of Pb-Pb collisions up to 50 kHz. An upgrade of the ITS will be necessary in order to comply with these requirements. Various ITS upgrade related studies were performed in 2011. The following subjects were covered: available technologies for silicon detectors production, preliminary optimization of the detector layout in order to maximize the detector performance, evaluation of the expected physics performance of ALICE after the ITS upgrade. Results of these studies will be presented in the second part of the seminar.
by DR Serhiy Senyukov