Beam deflection due to axial channeling in a silicon crystal bent along the axis was observed with
400 GeV/c protons at the CERN Super Proton Synchrotron. The condition for doughnut scattering of
protons by the atomic strings of the crystal was attained. Such a condition allowed one to observe a beam
deflection of 50 microrad with about 30% efficiency. The contribution of hyperchanneled states of protons to
the observed beam deflection was less than 2% according to simulation results
