Ruprecht Karls Universität Heidelberg
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Physikalisches Institut
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Stellenangebote - Master Arbeiten

Master Arbeiten

Improving charged-particle tracking in ALICE with the Transition Radiation Detector Klaus Reygers,
The Large Hadron collider (LHC) provides collisions between lead ions at extreme-high energies, which allows for the creation of conditions similar to those just after the big bang in the laboratory environment. ALICE has been specifically designed to study the formation of a new phase of matter, the Quark-Gluon Plasma (QGP), which is expected at these high energy densities. Its particle identification (PID) capabilities down to momenta of 100 MeV/c makes it unique at the LHC to investigate the properties of QGP. Particle Identification is carried on following a precise tracking of the particles emerging from a Pb−Pb collision in the central barrel of ALICE, which is composed of several sub- detectors: Inner Tracking System (ITS), Time Projection Chamber (TPC), Transition Radiation Detector (TRD) and Time of Flight (TOF) detector. At the start of the first LHC run in 2009 the TRD participated with seven out of eighteen super-modules. Therefore it has not been used in the tracking. Installation of the remaining super-modules was completed in 2013-2014 and the TRD is now ready to be used for the tracking. According to the simulation results, the TRD is expected to improve significantly the overall momentum resolution and the tracking capabilities of the ALICE central barrel by providing additional space points. The aim of this project is to include TRD into the official track reconstruction framework and study its impact on the overall tracking, and thus the PID, performance of the ALICE detector.

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