Muon tracking underground

Computer Science – Performance

Scientific paper

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Cosmic Ray Showers, Muons, Particle Tracks, Radiation Counters, Underground Structures, Angular Resolution, Performance Tests

Scientific paper

The design and performance of plastic streamer tubes for use in large underground particle-physics experiments such as the muon, astrophysics, and cosmic-ray observatory (MACRO) being developed for Gran Sasso Laboratory are reported. The large (1000 sq m or more) detector area required to achieve high-angular-resolution muon tracking in MACRO is covered by modules with eight 3 x 3-cm-cross section active streamer-tube cells each, similar to those used in the Mt. Blanc Laboratory detector. The MACRO modules have a maximum length of 12 m; and the cells have 60-micron-diameter wires, two conducting graphite sides, and two insulating sides (electrodeless electric-field shaping). The results of performance tests flowing 3:1 He:n-pentane through a tube module are presented graphically. Spatial resolution 1 cm and time resolution 100 ns are obtained, and the ability of the streamer tubes to detect large ionization losses with respect to the minimum is demonstrated.

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