The E760 lead-glass central calorimeter: design and initial test results

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Abstract

The central calorimeter in Fermilab experiment E760++ has been designed to measure the topology and energies of electrons and photons in the decay of charmonium formed in pp annihilation. The calorimeter is composed of 1280 lead-glass Cherenkov counters read out with photomultiplier tubes. This paper discusses design criteria for the calorimeter and describes how these criteria were met. Data from tests in low energy (10–84 MeV) and medium energy (1–4 GeV) beams are presented showing a spatial resolution of 9 mm, an energy resolution of (3.0 ± 0.3)%√E[GeV] + (1.5 ± 0.5)%, and an effective energy threshold below 10 MeV.

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    Work supported in part by the U.S. National Science Foundation and the U.S. Department of Energy.

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    Fermilab-Ferrara-Genova-U.C. Irvine-Northwestern-Penn. State-Torino collaboration.

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