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The Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA)experiment at the Antiproton Decelerator (AD) facility of CERN constructedsegmented scintillators to detect and track the charged pions which emerge fromantiproton annihilations in a future superconducting radiofrequency Paul trapfor antiprotons. A system of 541 cast and extruded scintillator bars werearranged in 11 detector modules which provided a spatial resolution of 17 mm.Green wavelength-shifting fibers were embedded in the scintillators, and readout by silicon photomultipliers which had a sensitive area of 1 x 1 mm^2. Thephotoelectron yields of various scintillator configurations were measured usinga negative pion beam of momentum p ~ 1 GeV/c. Various fibers and siliconphotomultipliers, fiber end terminations, and couplings between the fibers andscintillators were compared. The detectors were also tested using theantiproton beam of the AD. Nonlinear effects due to the saturation of thesilicon photomultiplier were seen at high annihilation rates of theantiprotons.

Segmented scintillation detectors with silicon photomultiplier readout for measuring antiproton annihilations