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The HERA-B Outer Tracker consists of drift tubes folded from polycarbonate foil and is operated with Ar/CF 4 /CO 2 as drift gas. The detector has to stand radiation levels which are similar to LHC conditions. The first prototypes exposed to radiation in HERA-B suffered severe radiation damage due to the development of self-sustaining currents (Malter effect). In a subsequent extended...
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