  Tau neutrino identification with the IceCube experiment would open new
windows to neutrino physics as well as enable novel searches for cosmic
neutrino sources. This work aims at a identification of tau neutrinos with
astrophysical origin at energies above 100TeV. For identification, we search
for a double pulse structure in the signal of one of IceCubes Digital Optical
Modules originating from a tau neutrino interaction and a subsequent tau decay
within the detector. In this work, we present constraints on the tau neutrino
flux based on an event sample with a livetime of about 7.5 years of IceCube
data.
