Scintillating plastic fibres find an increasing number of applications in different fields ranging from elementary particle detection to radiobiology. One of the yet open questions is the long time ...stability of these fibres. For this sake, experiments have been performed under 2 MeV electron and under 70 MeV proton irradiation, in a way so that the counteracting effects of radiation-induced degradation and thermal defect annealing at room temperature are well separated in time scale. Thus, it became possible to determine them both, and, furthermore, to establish predictions for the fibre efficiency under any operational condition. The fibre degradation scales with the accumulated electronic energy density.
Different prototypes of fiber detectors with an internal trigger system were tested in a 5 GeV electron beam at DESY. A silicon microstrip telescope was used for an external reference measurement of ...the beam to study the spatial resolution of the fiber detectors. On average 75% of all crossing electron tracks could be reconstructed with a precision better than 150 μm. These successful methodical investigations led to the installation of similar detectors in the proton beamline 81 m downstream of the central H1-detector at HERA as part of a forward proton spectrometer in spring 1994.
Using scintillator tile technology several square meters of plastic scintillator are read out by only two photomultipliers with a time precision of about 1.5 nsec. Two examples are discussed to build ...a detector based on this technology to search for cosmic muons and neutrinos.
A fiber detector concept is suggested allowing to registrate particles within less than 100 nsec with a space point precision of about 100 {mu}m at low occupancy. The fibers should be radiation hard ...for 1 Mrad/year. Corresponding prototypes have been build and tested at a 3 GeV electron beam at DESY. Preliminary results of these tests indicate that the design goal for the detector is reached.
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