The Tandem Dynamitron

A two-stage tandem accelerator system, powered by a Dynamitron high voltage generator, is currently undergoing factory tests. The parallel-coupled, cascaded-rectifier generator has been designed for a 5 mA current capability at maximum guaranteed voltage for future high current operation. A large diameter gas stripping canal is used in two-stage operation to optimize beam transmission. Titanium getter-ion pumps are mounted in the terminal at the ends of the stripper assembly to insure acceptable vacuum conditions in the fully shielded acceleration tubes. Guaranteed specifications of this model series are 150 ??A of targeted proton current at 10 MeV. The injector has delivered up to 250 ??A of H- and the generator has operated at 5.7 MV during initial testing. The complete system is now being assembled for beam test. Some novel features of this new tandem are described and operational performance characteristics measured during factory testing are reported.