Injection and accumulation schemes for the AGS Booster

The AGS Booster now under construction has three objectives. They are to increase the space charge limit of the AGS by preaccelerating protons from 200 MeV to 1.5 GeV, to increase the intensity of the polarized protons in the AGS by accumulating many linac pulses at 200 MeV, and to preaccelerate heavy ions from the BNL Tandem Van de Graaff before injection into the AGS. Therefore, we have to devise a different injection method for each of these three operations. The proton and polarized proton injection employs charge exchange of negative hydrogen while heavy ions must use multiturn injection into the betatron space. In this note we give a brief description of the heavy ion injection and high intensity proton injection, which are conventional and familiar to the reader, and describe the method of accumulating polarized protons in some detail