Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 41: Instrumentation und Anwendungen

HK 41.1: Vortrag

Mittwoch, 9. März 2005, 14:00–14:15, TU MA041

First Front-end Electronics Integration Test Results of the ALICE TRD — •Marcus Gutfleisch — Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany

The Transition Radiation Detector (TRD) of ALICE incorporates 1.2 million channels which are individually read out and processed. This is accomplished by highly integrated full custom front-end electronics containing an analog preamplifier and shaper (PASA) and a mixed-signal chip performing event buffering and local tracking (TRAP). Both chips are combined on small multi-chip modules (MCM). 65664 of these will be integrated on the detector.

The main task of the TRAP chip is online pattern recognition of segments of particle tracks (tracklet). It contains four CPUs and a tracklet preprocessor. To improve tracking resolution a digital filter is implemented performing nonlinearity, baseline and gain correction, signal symmetrisation (tail cancellation) and crosstalk suppression. The low power 10 Bit 10 MHz ADCs are integrated on the chip.

Tracklet information and raw data is shipped by an 8 Bit 120 MHz double data rate network interface merging its own data and that of neighboring TRAP chips into a common data stream which is organized in a tree structure.

Results of a first integration test under beam conditions using a six layer detector stack with 128 data taking and 11 merging MCMs at the Proton Synchrotron (PS) at CERN are presented.

This project is supported by the BMBF (06HD9551).