BEAM DYNAMICS CALCULATIONS FOR A PROTOTYPE OF A HIGH-CURRENT HEAVY-ION RFQ

A 27 MHz heavy-ion RFQ for high currents at low ion energies has been designed and built for RF and beam tests. The accelerating structure i s a 4-rod RFQ with spiral stems, developed in the institute. This RFQ will serve as a prototype for the first part of a large RFQ, which may be installed in the new high-current injector of GSI. Particle dynami cs calculations were carried out to check the RFQ design with respect to beam quality and transmission in the bunch-forming process. Results of calculations are discussed including some requirements of HIIF inj ection. A description of the experimental set-up and first results fro m beam measurements will be given by Kipper et al. in this volume.