Design and performance of the ASP lead-glass calorimeter☆

Abstract The design of the ASP detector is described and details of the construction and performance of the lead-glass tracking calorimeter are presented. ASP, a nonmagnetic particle detector, was used at the PEP e + e − storage ring at s = 29 GeV to study low-multiplicity final states consisting primarily of electrons and photons. The design utilized extruded lead-glass bars to obtain a compact electromagnetic calorimeter with good energy resolution, tracking and pattern recognition capabilities.