Abstract
The extremely high multiplicity environment of ultra-relativistic heavy ion collisions imposes stringent performance requirements on the tracking detectors used in the four RHIC experiments. This paper will emphasize the tracking detectors of the PHENIX experiment. The PHENIX central arm spectrometers utilize three different types of tracking chambers, each with unique detector and electronics design. Two multi-layer focusing drift chambers provide high resolution charged particle momentum measurement with excellent two-track resolution. Three layers of pad chambers with unique pixel-pad readout system aid the tracking by supplying three-dimensional coordinates along the charged particle trajectories in the field-free region. Time-expansion chambers are used for tracking, as well as particle identification, by multiple dE/dx measurements along each track. The detector designs and their performance in the RHIC2000 run are presented.
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