Transport of ions in RFQ-accelerators

Radio frequency quadrupole (RFQ) structures are well suited to accelerate all kinds of ions at low particle energies with high transmission efficiency even at high beam currents. Like other RF-accelerators they normally have a fixed velocity profile and corresponding fixed input and output energies per nucleon of the accelerated ions. But due to strong transverse focusing RFQ-accelerators can also capture and transport very efficiently ions with energies and specific charge states even far away from the design values. Results of calculations will be presented and compared to measurements