Recent Advances and Developments in Electrostatic Accelerators

Negative heavy ions (O-, Cu-, AlO-, Au-) were injected into and accelerated through a one megavolt tandem accelerator. Transmission of the charge states was measured over a terminal voltage range of 300 - 1000 kilovolts. For all the heavy ions, the most abundant charge state at 1 megavolt terminal voltage was 2+ using oxygen stripper gas. Up to 0.57 particle microamperes of 2+ were measured.