  The performance of a scintillating fiber detector prototype for tracking
under high rate conditions is investigated. A spatial resolution of about100
micron is aimed for the detector. Further demands are low occupancy and
radiation hardness up to 1 Mrad/year. Fibers with different radii and different
wavelengths of the scintillation light from different producers have been
extensively tested concerning light output, attenuation length and radiation
hardness, with and without coupling them to light guides of different length
and diameter.
  In a testrun at a 3 GeV electron beam the space dependent efficiency and
spatial resolution of fiber bundels were measured by means of two external
reference detectors with a precision of 50 micron. The light output profile
across fiber roads has been determined with the same accuracy.
  Different technologies were adopted for the construction of tracker modules
consisting of 14 layers of 0.5 mm fibers and 0.7 mm pitch. A winding technology
provides reliable results to produce later fiber modules of about 25 cm x 25 cm
area.
  We conclude that on the basis of these results a fiber tracker for high rate
conditions can be built.
