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Construction of an electromagnetic calorimeter for the HERMES experiment at HERA - DESY

HERMES is a new facility with unique capability to measure polarised and unpolarised lepton scattering at 27.5 GeV from polarised and unpolarised internal gas targets in the East Hall of the HERA storage ring. The internal target technique provides a very clean approach to measurement of both polarised and unpolarised observables. This new facility takes data for up to six months per year and has the potential to provide important, new information at the interface of nuclear and particle physics using deep inelastic scattering. Simultaneous with inclusive measurement of deep inelasic scattering in the kinematic range 0.02 <x < 0.7, the HERMES experimental configuration allows comprehensive and systematic studies of semi-inclusive final states. First data were taken in 1995 with a polarised 3He target and unpolarised hydrogen and deuterium targets.

The calorimeter was built from special radiation resistant lead glass TF 101 (available from supplier in Russia) and is one of the major components of experimental setup. It measures energy of scattered positrons, reject pions and provides the trigger for the experiment, which allows the suppression of most ofthe background particles emitted from the target.

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Max-Planck Gesellschaft zur Förderung der Wissenschaften e.V.
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