Correcting for Distortions due to Ionization in the STAR TPC

Details Correcting for Distortions due to Ionization in the STAR TPC Correcting for Distortions due to Ionization in the STAR TPC

2005-12-16

arxiv.org/abs/physics/0512157v1

Nucl.Instrum.Meth. A566 (2006) 22-25

Physics

Instrumentation and Detectors

6 pages, 7 figures, proceedings of the Workshop on Tracking in High Multiplicity Environments (TIME 05) in Zurich, Switzerland

Scientific paper

10.1016/j.nima.2006.05.131

Physics goals of the STAR Experiment at RHIC in recent (and future) years drive the need to operate the STAR TPC at ever higher luminosities, leading to increased ionization levels in the TPC gas. The resulting ionic space charge introduces field distortions in the detector which impact tracking performance. Further complications arise from ionic charge leakage into the main TPC volume from the high gain anode region. STAR has implemented corrections for these distortions based on measures of luminosity, which we present here. Additionally, we highlight a novel approach to applying the corrections on an event-by-event basis applicable in conditions of rapidly varying ionization sources.

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