Individual rare radioactive ion injection, cooling and storage in a ring

A secondary radioactive ion beam produced from fragmentation of a primary beam in a target has a large emittance and momentum spread after a fragment separator. At low production rates of 1–106 ion/s the parameters of each particle can be measured individually with a rather high accuracy. We propose to use an “individual trajectory correction” in an appropriate transfer channel, and “individual injection” in a storage ring and a fast stacking procedure for the injected beam at small emittance and momentum spread. With such a scheme it is possible to obtain a storage rate of 5×102–103 ions/s at an ion flux of 103–104 ions/s. This represents 5–6 orders of magnitude increase of the injection efficiency as compared to standard multiturn injection with a continuous beam at low intensity.