Secondary Yield Enhancement from Current-Carrying Target

Monte Carlo calculations of relative yield of ??-, K- and p- secondaries from cylindrical current-carrying production targets in high energy proton beams are presented. The results show that the expected focusing effect can increase the secondary intensity within the acceptance of a secondary beam by significant factors--in some cases two or more--with currents in the 15-to- 25 kA range. These currents are readily obtainable from pulsed power supplies. For dc operation currents of this magnitude appear possible from existing power supplies and for targets of small transverse dimensions such as 2 mm radius Ag.