MAFF a€“ The Munich accelerator for ???ssion fragments

摘要

At the new high ???ux reactor FRM-II in Munich the accelerator MAFF (Munich accelerator for ???ssion fragments) is under design. In the high neutron ???ux of 1014 n/cm2 s up to 1014 neutron-rich ???ssion fragments per second are produced in the 1 g U-235 target. Ions with an energy of 30 keV are extracted from the ion source. In the mass seperator two isotopes can be selected. One of the beams is used for low energy experiments, the other one is injected into an ECRIS (or EBIS) for charge breeding to a e?‘?/e??′ a‰￥ 0.16. A gas ???lled RFQ cooler is used for emittance improvement. The subsequent LINAC delivers beams with an energy ranging from 3.7 MeV/u to 5.9 MeV/u. New IH structures are being developed at the Munich tandem laboratory. A small storage ring is planned in a further stage to recycle the ???ssion fragments. A thin target foil can be placed into this ring, e.g., for synthesis of super-heavy elements. The through-going beam tube has been installed in the heavy water tank of the reactor. Tests of the target ion source in a special oven to test long term stability and safety tests were in progress.