Comparison between schemes for heavy ion injection into Nuclotron booster

In order to increase the intensity of the Nuclotron beams, a project of circular injector, the so-called booster, is under consideration for several years. This paper is especially devoted to the problem of heavy ion injection into the Nuclotron booster. Several injection methods have been studied, namely: stacking in the horizontal phase space, RF stacking, stripping injection and injection by means of electron cooling of the injected ions. A comparison between all these methods is given