A major component of the CERN-LHC ALICE detector is the central barrel, contained in the large L3 magnet and composed of detectors devoted mainly to the study of hadronic signals  and dielectrons . The main tracking devices are the silicon based Inner Tracking System (ITS) and the Time Projection Chamber (TPC). Within their acceptance (−0.9 ≤ η ≤ 0.9) about 12000 tracks will be recorded, yielding information about particle type and momentum. The readout planes at the two sides of the TPC field cage are subdivided into 18 segments each. The segments are split into an inner and an outer readout chamber (ROC). The ROCs are conventional multiwire proportional chambers with cathode pad readout as used in many TPCs before. After successful testing of prototypes , the series productio
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