Abstract
We constructed gas a Cherenkov beam counter for a lead beam to obtain start signals of time of fight measurements for relativistic heavy ion experiments in WA98 at CERN-SPS. The intrinsic timing resolution of the gas Cherenkov counter was found to be ≤ 30 ps at a beam intensity up to 3 × 10 5 ions/s and the charge resolution ( ΔZ Z ) was 2.0% for lead ions of 160 GeV/ c per nucleon. This counter has been successfully operated for more than 1 1 2 month of heavy ion run in 1995.
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