  We report on a deterministic single ion source with high repetition rate and
high fidelity. The source employs a magneto-optical trap, where ultracold
Rubidium atoms are photoionized. The electrons herald the creation of a
corresponding ion, whose timing information is used to manipulate its
trajectory in flight. We demonstrate an ion rate of up to 40 kHz and achieve a
fidelity for single ion operation of 98 %. The technique can be used for all
atomic species, which can be laser-cooled, and opens up new applications in ion
microscopy, ion implantation and surface spectroscopy.
