  We present a unitary quantum control scheme that produces a highly
monochromatic ion beam from a Paul trap. Our protocol is implementable by
supplying the segmented electrodes with voltages of the order of Volts, which
mitigates the impact of fluctuating voltages in previous designs and leads to a
low-dispersion beam of ions. Moreover, our proposal does not rely on
sympathetically cooling the ions, which bypasses the need of loading different
species in the trap -- namely, the propelled ion and, e.g., a $^{40}$Ca$^+$
atom able to exert sympathetic cooling -- incrementing the repetition rate of
the launching procedure. Our scheme is based on an invariant operator linear in
position and momentum, which enables us to control the average extraction
energy and the outgoing momentum spread. In addition, we propose a sequential
operation to tailor the transversal properties of the beam before the ejection
to minimize the impact spot and to increase the lateral resolution of the
implantation.
