Abstract

The MACRO (Monopoles, Astrophysics and Cosmic Ray Observatory) detector is presently being installed in Hall B of the Gran Sasso National Laboratory. It is a large area detector with an acceptance for isotropic particles of about 10.000 m2 sr. It is designed to search for rare particles and rare phenomena in the natural penetrating radiation. It will search for GUT Magnetic Monopoles and any supermassive penetrating charged particles; it will perform a survey of cosmic point sources of high energy gammas and neutrinos and a systematic study of cosmic ray muons and multimuons. Three complementary techniques are used: liquid scintillation counters, limited streamer tubes and track-etch. Here we describe the track-etch detector, its implementation for the first supermodule and the tests in progress on CR39 exposed to high energy ions.

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