Oak Ridge 25URC tandem accelerator

Abstract

In FY 2011, the 25URC operated for more than 2700 research hours. The radioactive beams (RIBs) Be, Al, Ge, Sn and Te accounted for about 1400 of these hours. Ge, Sn and Te were provided using an on-line production target, while the long-lived species Be and Al were provided with a sputter-type ion source operating in “batch” mode, where the targets are prepared elsewhere and inserted into the ion source. The other 1300 research hours were for stable ion beams in support of RIB experiments and ISOL development. In addition to the tandem-related research hours, there were slightly more than 1000 hours of radioactive beams delivered to the Low Energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS) and to the High Power Target Laboratory (HPTL). Since these beams can be delivered without benefit of the tandem accelerator, it is possible to continue radioactive ion beam research during tandem maintenance periods.