München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 7: Instrumentation und Anwendungen

HK 7.4: Vortrag

Montag, 20. März 2006, 15:00–15:15, H

The ALICE Transition Radiation Detector - Tuning the Electron Trigger with Cosmic Tracks — •Bogdan Vulpescu — Physikalisches Institut der Universitaet Heidelberg, Germany

The Transition Radiation Detector (TRD) plays an essential role in the early trigger levels (L0 and L1) of the ALICE detector. With a short latency (6.1 microseconds) and large tracking granularity (1.2 million channels), the TRD will select high momentum particles (jets) and identify (di-)electrons from a few thousand tracks produced in heavy ions collisions at the Large Hadron Collider. A stack of 6 TRD chambers has been successfully tested at the CERN PS beam. The tracking and particle identification can be further tested and tuned in the various parameters of the online processing, with progressively advanced scheme of the final data readout, by using the flux of cosmic rays at ground level. Cosmic tracks will also be used in tests of the assembled set of chambers (super-modules), investigating larger areas of the active detector volumes, and for the alignment and calibration in the final setup. We present results from different tests of the online/offline tracking, which are relevant for the performance of the TRD as a trigger detector. This work is supported by BMBF.