Author/Authors :
Alme، نويسنده , , J. and Andres، نويسنده , , Y. and Appelsh?user، نويسنده , , H. and Bablok، نويسنده , , S. and Bialas، نويسنده , , N. and Bolgen، نويسنده , , R. and Bonnes، نويسنده , , U. and Bramm، نويسنده , , R. and Braun-Munzinger، نويسنده , , P. and Campagnolo، نويسنده , , Lars R. and Christiansen، نويسنده , , P. and Dobrin، نويسنده , , A. and Engster، نويسنده , , C. and Fehlker، نويسنده , , D. and Foka، نويسنده , , Y. and Frankenf، نويسنده ,
Abstract :
The design, construction, and commissioning of the ALICE Time-Projection Chamber (TPC) is described. It is the main device for pattern recognition, tracking, and identification of charged particles in the ALICE experiment at the CERN LHC. The TPC is cylindrical in shape with a volume close to 90 m3 and is operated in a 0.5 T solenoidal magnetic field parallel to its axis.
s paper we describe in detail the design considerations for this detector for operation in the extreme multiplicity environment of central Pb–Pb collisions at LHC energy. The implementation of the resulting requirements into hardware (field cage, read-out chambers, electronics), infrastructure (gas and cooling system, laser-calibration system), and software led to many technical innovations which are described along with a presentation of all the major components of the detector, as currently realized. We also report on the performance achieved after completion of the first round of stand-alone calibration runs and demonstrate results close to those specified in the TPC Technical Design Report.
