  In planar superconductor thin films, the places of nucleation and
arrangements of moving vortices are determined by structural defects. However,
various applications of superconductors require reconfigurable steering of
fluxons, which is hard to realize with geometrically predefined vortex pinning
landscapes. Here, on the basis of the time-dependent Ginzburg-Landau equation,
we present an approach for steering of vortex chains and vortex jets in
superconductor nanotubes containing a slit. The idea is based on tilting of the
magnetic field $\mathbf{B}$ at an angle $\alpha$ in the plane perpendicular to
the axis of a nanotube carrying an azimuthal transport current. Namely, while
at $\alpha=0^\circ$ vortices move paraxially in opposite directions within each
half-tube, an increase of $\alpha$ displaces the areas with the
close-to-maximum normal component $|B_\mathrm{n}|$ to the
close(opposite)-to-slit regions, giving rise to descending (ascending) branches
in the induced-voltage frequency spectrum $f_\mathrm{U}(\alpha)$. At lower $B$,
upon reaching the critical angle $\alpha_\mathrm{c}$, close-to-slit vortex
chains disappear, yielding $f_\mathrm{U}$ of the $nf_1$-type ($n\geq1$: an
integer; $f_1$: vortex nucleation frequency). At higher $B$, $f_\mathrm{U}$ is
largely blurry because of multifurcations of vortex trajectories, leading to
the coexistence of a vortex jet with two vortex chains at $\alpha=90^\circ$. In
addition to prospects for tuning of GHz-frequency spectra and steering of
vortices as information bits, our findings lay foundations for on-demand tuning
of vortex arrangements in 3D superconductor membranes in tilted magnetic
fields.
