Initial performance of the VENUS transition radiation detector

Details Initial performance of the VENUS transition radiation detector Initial performance of the VENUS transition radiation detector

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nimpa.323..471t&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 323, Issue 1-2, p. 471-476.

Physics

7

Scientific paper

The VENUS-TRD is a cylindrical transition radiation detector, extending from 127 cm to 157.7 cm radially and 296 cm axially. It is designed to improve the e/π separation capability of the VENUS detector by a factor of 10 in order to complement the lead glass calorimeter. It covers an angular region of cos θ < 0.68 and contains four layers of radiators and X-ray chambers. It has been working very stably since it started data-taking at the TRISTAN e+e- storage ring in June, 1991. The pion rejection power (Rπ = 1/ɛπ) at an electron efficiency of 90% is Rπ = 10+/-1 and 15+/-2 for isolated tracks with a momentum range of 1 < P < 3 and 3 < P < 10 GeV/c, respectively. It decreases to Rπ = 7+/-1 for tracks with P > 1 GeV/c in hadronic events due to overlap of the tracks in the chamber cells of the TRD. The VENUS-TRD is the largest TRD to perform in colliding beam experiments.

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