Abstract
We report on measurements with different transition radiation detector configurations, which were performed with the aim of pion-electron-discrimination in the momentum range between 1 GeV/ c and 100 GeV/ c. The test set-up consisted of four polypropylene fibre radiators with proportional wire chambers as photon detectors. We tested about 50 combinations varying the diameter of the fibre, the density of the radiators and the thickness of the chambers. Results of measurements performed at a DESY testbeam at energies between 0.6 and 6.6 GeV and of extrapolations to particle momenta up to 100 GeV/ c are discussed. At 95% electron efficiency a pion contamination of a few per cent can be achieved over the full energy range.
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