Preshower Detector Research Articles

Electron-pion discrimination with a scintillating fiber calorimeter

Abstract We report on an experimental study of a variety of techniques for discriminating between (isolated) electrons and pions in a lead and scintillating fiber calorimeter without longitudinal segmentation. Using information from the lateral shower development, from a pre-shower detector, from the time structure of the signals, or from a combination of these we measure pion rejection factors of up to several thousand while maintaining electron efficiencies of 95% or higher.

Performance of the UA2 scintillating-fibre detector

A large scintillating-fibre detector consisting of ≈ 60 000 scintillating plastic fibres of 1 mm diameter and 2.4 m length has been used successfully as a tracking and preshower detector in the UA2 experiment at CERN. The detector readout and the results from the p p data-taking run are described.

Performance of the scintillating fibre detector in the upgraded UA2 detector

A large scintillating fibre detector consisting of ≈ 60 000 scintillating plastic fibres of 1 mm diameter and 2.4 m length has been used successfully as a tracking and preshower detector in the UA2 experiment at CERN. The detector readout, the pattern recognition algorithm and the results from the p p data taking run are described.

The construction of a scintillating-fiber tracking and preshower detector for the UA2 improvement program

The central detector of the UA2 experiment at CERN includes a cylindrical tracking and electromagnetic preshower detector which employs 1 mm diameter scintillating fibers as the sensitive medium. The device is 2 m long and extends from 38 to 44 cm in its radial dimension. Sixty thousand fibers are arranged in 24 cylindrical layers, the outer six preceded by 1.5 radiation lengths of lead, permitting the localized detection of electromagnetic showers. In this article we describe the fabrication of the fibers, the assembly procedure used in the construction of the detector and the degree of uniformity achieved. Preliminary results on the performance of the detector during the December 1987 CERN Collider run are also presented.

The design and construction of a scintillating fiber tracking detector

The central detector of the upgraded UA2 experiment at CERN includes a cylindrical tracking and electromagnetic preshower detector which employs 1 mm diameter scintillating fibers as the sensitive medium. The device is two meters long and extends from 38 to 44 cm in its radial dimension. Sixty thousand fibers are arranged in 24 cylindrical layers, the outer six preceded by 1.5 radiation lengths of lead, permitting the localized detection of electromagnetic showers. This design was made possible by the development of plastic scintillating fibers with attenuation lengths of over 1.5 m and with a light yield sufficient to assure a detection efficiency greater than 90% for minimum ionizing particles traversing the fiber at any point along its 2 m length. In this article we describe the fabrication and performance of the fibers, the assembly procedure used in the construction of the detector, and the degree of uniformity achieved.