  The LHCb experiment has the unique possibility, among the LHC experiments, to
be operated in fixed target mode, using its internal gas target SMOG. The
energy scale achievable at the LHC and the excellent detector capabilities for
vertexing, tracking and particle identification allow a wealth of measurements
of great interest for cosmic ray and heavy ions physics. We report the first
measurements made in this configuration: the measurement of antiproton
production in proton-helium collisions and the measurements of open and hidden
charm production in proton-argon collisions at $\sqrt{s_\textrm{NN}} =$ 110
GeV.
