Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 41: Accelerators and Instrumentation II

HK 41.8: Talk

Tuesday, March 17, 2009, 18:30–18:45, H-ZO 90

Alignment of ALICE TRD Modules Using Cosmic Rays — •Eva Sicking — Institut für Kernphysik, WWU Münster

The Transition Radiation Detector (TRD) is a central component of the heavy ion collider experiment ALICE at the LHC. The cylindrical detector consists of 18 super modules, which undergo final assembly in Münster. One super module contains 30 independent detector chambers. As part of the assembly process tracks of cosmic rays are recorded and reconstructed to perform a first calibration pass.
Due to limited accuracy during assembly the real position of the chambers can differ from their positions in the ideal geometry. To provide a high position resolution and thus a high resolution in transverse momentum, the geometry has to be corrected for these displacements.
We will present a first determination of these displacements using straight tracks of cosmic rays. These results allow for a survey of the chamber positioning during super module assembly and will be used during reconstruction.