Abstract
A calorimeter module of 17 radiation lengths depth has been built. Wavelength shifter (WLS) bars coupled to rectangular silicon photodiodes (PDs) are used as readout. Considerations in the design of the WLS bars, with particular emphasis on optimising the efficiency for PD readout, are discussed. The energy resolution for electrons has been determined to be about 9% √E between 2 and 50 GeV. The response to hadrons is presented and the prospects for the construction of a full-sized hadron calorimeter are discussed.
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