An accelerator (MAFF) for the new Munich high flux reactor FRM-II is under design [1,2] in order to deliver intense beams of very neutron-rich fission fragments of up to1012particles per second with final energies between 3.7 and 5.9 MeV/u to perform experiments for the production of heavy elements [3]. To obtain an efficient acceleration in a short LINAC, charge breeding of the1+-ion beam from the reactor to aq/A⩾0.16is required. New measurements with an electron cyclotron resonance ion source (ECRIS) [4] have shown that the requirements for a low duty cycle LINAC (10&percent;) can be fulfilled by the ECRIS. To reach a high flexibility in the final energy with a small number of structures, new kinds of IH-structures are under development at the Munich tandem laboratory. ©1999 American Institute of Physics.