München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 38: Instrumentation und Anwendungen

HK 38.5: Vortrag

Mittwoch, 22. März 2006, 17:30–17:45, H

Finalization of the Local Signal Processing within the ALICE TRD — •Marcus Gutfleisch — Kirchhoff-Institut für Physik, Universität Heidelberg,

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). Of these, about 65,000 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 a tracklet preprocessor and four CPUs. To improve tracking resolution a digital filter is implemented performing nonlinearity, baseline and gain corrections as well as signal symmetrisation (tail cancellation) and crosstalk suppression. On the chip, 21 low power 10 Bit 10 MHz ADCs are integrated.

Tracklet information and raw data are 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.

The finalization of the hardware-based online signal processing is described. It includes the development of calibration algorithms for the filter and tracking system parameters. Its performance is shown by analyzing results of the application in the prototype system.

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