 If there is significant beam damping, for example radiation damping of electrons due to synchrotron radiation, then an injected pulse may be placed on the edge of phase space and then left to damp in transverse phase space into the stored beam before injecting a further pulse.Typical damping times from synchrotron radiation are tens of milliseconds, allowing many pulses per second to be accumulated.If extraction of particles is required (for example in a chain of accelerators), then single-turn extraction may be performed analogously to injection.