SPACE-CHARGE LIMITATIONS FOR DIFFERENT INJECTION SCHEMES AT THE BROOKHAVEN RELATIVISTIC HEAVY-ION ACCELERATOR COMPLEX

Two different ion source choices for the Relativistic Heavy-Ion Collid er (RHIC) are discussed from the point of view of intensity limitation s to be expected from early space-charge beam blowup effects. Simple s caling considerations indicate that such effects will be more difficul t to mitigate for a proposed high-charge state EBIS-ion-source-RFQ-Lin ac system and single-turn AGS Booster injection as compared to the exi sting negative ion source - Tandem Van de Graaff multi-turn injection scheme, making it questionable whether present intensities will be mat ched or exceeded. Also, some presently possible avenues to larger inte nsities wouldn't be available with the new system. New ion sources sho uld be planned as complements - not substitutes - for the present syst em because large heavy-ion facilities, in general, require multiple in jectors and because RHIC, the largest of them all will have an injecto r complex that will also serve other applications. (C) 1998 Elsevier S cience B.V. All rights reserved.