Space charge in drift chambers operated with the Xe,CO2(15%) mixture

Details Space charge in drift chambers operated with the Xe,CO2(15%) mixture Space charge in drift chambers operated with the Xe,CO2(15%) mixture

2004-02-09

arxiv.org/abs/physics/0402043v1

Nucl.Instrum.Meth. A525 (2004) 447-457

Physics

Instrumentation and Detectors

18 pages, 10 figures, accepted for publication in Nucl.Instrum.Meth. A. Data files available at http://www-alice.gsi.de/trd

Scientific paper

10.1016/j.nima.2004.01.076

Using prototype modules of the ALICE Transition Radiation Detector we investigate space charge effects and the dependence of the pion rejection performance on the incident angle of the ionizing particle. The average pulse height distributions in the drift chambers operated with the Xe,CO2(15%) mixture provide quantitative information on the gas gain reduction due to space charge accumulating during the drift of the primary ionization. Our results demonstrate that the pion rejection performance of a TRD is better for tracks which are not at normal incidence to the anode wires. We present detailed simulations of detector signals, which reproduce the measurements and lend strong support to our interpretation of the measurements in terms of space charge effects.

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