The HERA-B experiment is designed to study beauty particle production and d
ecay using the HERA 920 GeV proton beam interactions with an internal targe
t. The Muon detector provides identification for muons having momenta great
er than 5 GeV/c and triggering on the muon pair from J/psi decay, Three dif
ferent chamber types are employed for operation in a high-rate environment.
The overall design, performance and current status are discussed. (C) 2001
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