  A beam tagging hodoscope prototype made of squared 1 mm$^2$ fibers arranged
in two perpendicular planes and coupled to multi-anode photomultipliers has
been studied using 65 MeV proton as well as 95 MeV/u $^{12}$C beams at various
intensities. This hodoscope successfully provided 2D images of proton beams
with a detection efficiency larger than 98 % with logical OR condition between
the two fiber planes. The detection efficiency with a coincidence between the
two planes is close to 75 % for beam intensities up to $\sim1$ MHz. Moreover,
the timing resolution is around 1.8 ns FWHM. Overall, the performances show
that such a technology is viable for beam monitoring during hadrontherapy.
