Abstract
In a lead/scintillating-fiber calorimeter with fibers oriented in the direction of the incident particles, the different longitudinal development of the showers generated by electrons and pions results in a different time structure of the signals. We have designed a constant-fraction discriminator, which allows the achievement, on-line, of the electron/pion ( e π ) separation needed for trigger purposes. The fast signals from the calorimeter, of 10–20 ns duration, demand a circuit able to operate in the high frequency domain. We tested the performance of the circuit with signals produced by a prototype calorimeter constructed by the LAA-SPACAL collaboration at CERN. The circuit allows triggering on electrons with an efficiency higher than 99% with about 6% of the pions faking electrons in the dynamic range from 0.2 V to more than 2 V. The decision time is shorter than 60 ns and the typical time resolution is better than 100 ps.
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