Electrodynamic calculations of the 4-rod-RFQ resonator for the Heidelberg high current injector

At the Max-Planck-Institut fur Kernphysik, a new type of accelerator is under operation which consists of a CHORDIS and an ECR ion source, two directly coupled 4-Rod-RFQ and eight 7-gap resonators. The RFQs are designed to accelerate ions with a minimum charge to mass ratio of q/A=1:9 up to an energy of 0.478 MeV/u. Both RFQ resonators operate at a frequency of 108.48 MHz with a maximum pulsed power of 90 kW (25% duty factor). The development of the RFQ resonators was accompanied by extensive numerical simulations with the code MAFIA. We present the results of electrostatic calculations with modulated electrodes and the results of electrodynamic simulations of RFQ resonators.