Author/Authors :
Carlén، نويسنده , , L. and Chenawi، نويسنده , , K.El and Chujo، نويسنده , , T. and Enosawa، نويسنده , , K. and Garpman، نويسنده , , S. and Gustafsson، نويسنده , , H.-إ. and Kurata، نويسنده , , M. and Kurita، نويسنده , , K. and Lِhner، نويسنده , , H. and Martin، نويسنده , , M. and Miake، نويسنده , , Y. and Miyamoto، نويسنده , , Y. and Naef، نويسنده , , H. and Nilsson، نويسنده , , P. and Nishimura، نويسنده , , S. and Nystrand، نويسنده , , J. and، نويسنده ,
Abstract :
A large acceptance tracking system, specially developed for tracking at very high particle densities encountered in ultra-relativistic heavy-ion collisions is described. The system is a combination of multi-step avalanche chambers equipped with electronic pad readout with high position resolution in two dimensions and streamer-tube detectors with pad readout, with coarser position resolution, that is sufficient for safe pattern recognition. A high-resolution time-of-flight system (time resolution better than 90 ps) provides particle identification up to 8 GeV/c for pions and protons and pion/kaon separation up to 4 GeV/c. All detectors in the tracking system are read out with new, high-performance integrated circuits. The system can operate at high event rates due to efficient zero suppression. The performance of the system for tracking under real running conditions with Pb-beam at 158 A GeV in the WA98 experiment at CERN is presented.
Keywords :
Streamer tubes , Multi-step avalanche chamber , Time-of-flight , Tracking , Particle identification , Pad readout
