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T: Teilchenphysik

T 703: Halbleiterdetektoren V

T 703.1: Gruppenbericht

Mittwoch, 9. März 2005, 14:00–14:20, TU H112

The LHCb Silicon Tracker — •Johan Blouw — MPI fuer Kernfysik, Heidelberg, Germany

The Silicon Tracker (ST) of the LHCb Experiment consists of two components, the Trigger Tracker (TT) in front of the dipole magnet, and the Inner Tracker (IT) behind it. The TT station covers the full detector acceptance. It will be used in the trigger to provide transverse-momentum information for large impact-parameter tracks The IT, as part of the main tracking system, covers a cross-shaped area around the beam pipe, where high particle fluxes require a fine granularity detector. Various sensor designs have been considered and, have been studied in test beam experiments at CERN. For the read out, the Beetle chip has been developed at the ASIC-Lab Heidelberg in a radiation hard design. At a rate of 40 MHz, signals from 128 input channels are stored for the trigger latency of 4 µs into an analogue pipeline. A FIFO with a depth of 16 events allows deadtimeless readout of triggered events. The chip has been extensively tested in the lab and at the system level for the readout of silicon detectors under testbeam conditions. Results from chip tests and detector R&D will be presented together with the final ST detector design that emerged from these studies.