POSSIBILITIES FOR EXPERIMENTS WITH RARE RADIOACTIVE IONS IN A STORAGE RING USING INDIVIDUAL INJECTION

A radioactive ion beam (RIB) produced at a target bombarded with a primary beam has after a fragment separator a relatively large phase volume and small production rate. For instance, typical flux of 132 Sn isotope at the exit of fragment-separator is about 5⋅10 5 ions/s. Conventionally used scheme of the ion storage in a ring based on multitutrn injection and (or) RF stacking and stochastic cooling application can not provide a high storage rate at so pure intensity especially for short lived isotopes. In this report we discuss an alternative storage scheme which is oriented to the continuous ion beam from fragment separator at production rate of 10 4 ions/s or even less. It is based on the fact, that at low production rate the parameters of each particle can be measured individually with rather high accuracy. The particle trajectory can be individually corrected in a transfer channel from fragment separator to the storage ring using system of fast kickers. A fast kicker in the ring synchronized with a circulating bunch provides continuous injection of the ions. The scheme permits to store the ion number required for precise mass measurements and internal target experiment. A hope to obtain large luminosity of ion-electron collisions is related with a possibility of the ion beam crystallization at small particle number.