  In this paper we analyze the vacuum bosonic current and polarization induced
by a magnetic flux running along a higher dimensional cosmic string in the
presence of a flat boundary orthogonal to the string. In our analysis we assume
that the quantum field obeys Dirichlet or Neunmann conditions on the flat
boundary. In order to develop this analysis we calculate the corresponding
Wightman function. As consequence of the boundary, the Wightamn function is
expressed in term of two contributions: The first one corresponds to the
boundary-free cosmic string Wightman function, while the second one is induced
by the boundary. The boundary-induced contributions have opposite signs for
Dirichlet and Newman scalars. Because the analysis of vacuum current and
polarization effects in the boundary-free cosmic string spacetime have been
developed in the literature, here we are mainly interested in the calculations
of the effects induced by the boundary. Regarding to the induced current, we
show that, depending on the condition adopted, the boundary-induced azimuthal
current can cancel or intensifies the total induced azimuthal current on the
boundary; moreover, the boundary-induced azimuthal current is a periodic odd
function of the magnetic flux. As to the vacuum expectation values of the field
squared and the energy-momentum tensor, the boundary-induced contributions are
even functions of magnetic flux. In particular, we consider some special cases
of the boundary-induced part of the energy density and evaluate the normal
vacuum force on the boundary.
