Transport of Ions in RFQ- Accelerators* A b,stmc- t

Radio Frequency Quadrupole (RFQ) structures [1,2] 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 the strong transverse focusing- the RFQ-accelerators can also capture and transport very efficiently ions with energies and specific charge states even far away from the design values [3]. Results of calculations will be presented and compared to measurements. 1