Abstract
The high resolution calorimeter for the ZEUS detector at HERA is presented. The choice of a sandwich calorimeter from depleted uranium plates and plastic scintillator was made to accomplish compensation and thus the best possible energy resolution for hadrons and jets. The calorimeter is segmented transversely into towers and longitudinally into an electromagnetic and one or two hadronic sections. It is divided in a forward, barrel and rear part which surround hermetically the interaction region and the inner detectors. The expected energy resolutions are for electrons σ(E) E = 0.15 √E , and for hadrons σ(E) E = 0.35 √E , with a constant term of maximum 2% added in quadrature. First results from calorimeter test measurements are presented.
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