A TRANSITION RADIATION DETECTOR WHICH FEATURES ACCURATE TRACKING AND DE DX PARTICLE IDENTIFICATION/

We describe the results of a test run involving a Transition Radiation Detector that can both distinguish electrons from pions with momenta greater than 0.7 GeV/c and simultaneously track particles passing thro ugh the detector. The particle identification is accomplished through a combination of the detection of Transition Radiation from the electr on and the differences in electron and pion energy loss (dE/dx) in the detector. The dE/dx particle separation is most efficient below 2 GeV /c while particle ID utilizing Transition Radiation is effective above 1.5 GeV/c. Combined, the electron-pion separation is better than 5 x 10(2). The single-wire, track-position resolution for the TRD is appro ximately 230 mum.