Star TPC at Rhic.
Abstract
The construction of a Time Projection Chamber (TPC) for the RHIC collider STAR detector system(J. Harris and the STAR Collaboration, Conceptual Design Report for the Solenoidal Tracker At RHIC PUB-5347), (1992). is more than halfway completed. The TPC will provide tracking to measure heavy ion collisions of Au on Au as well as lighter projectiles including protons on protons. At RHIC, with center of mass energies of 200 GeV/n, it is expected that central collisions will yield 4000 charged particles in the acceptance region of the TPC. The design has been optimized to provide tracking and dE/dx values for the high density of particles with pseudo rapidity in the range of mid η mid = 0-1.8. The active gas volume of the TPC is a cylinder 4.2 meters long and 4 meters in diameter. Electrons left by the ionizing particles drift to either end of the TPC cylinder where they are read out with multi-wire proportional chambers equipped with continuous array pad readout. There are a total of 140,000 pads, each equipped with low noise electronics which take 512 time sample measurements, thereby providing a full 3D, 70 million pixel representation of the tracks through the gas volume. Both tracking and dE/dx are obtained from the pad signals. We will be reporting on design details, test results and construction progress.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1996
- Bibcode:
- 1996APS..DNP..PS20W