Schematic building blocks of a rare isotope research facility based upon a heavy
ion driver. For isotope production and separation in flight, one can use the resulting fast beams
directly, bring them to rest in solids, or stop them in a gas cell and extract them for use at very
low energies or at higher energies after reacceleration. Light-ion beams can be used to produce
isotopes at rest in a thick target from which they must be extracted by diffusion and effusion
(ISOL technique) before they can be used for experiments at very low energies or, after acceleration,
at higher energies.