Tandem SPS: New Concept for a High-Current Negative Ion Source
G.l. Dimov, Budker Institute of Nuclear Physics, Russia
The newly-developed Tandem Surface-Plasma Source (SPS) concept is expected to break new ground ,n the production of high-current, high-brightness H- ion beams. The Tandem SPS consist of three successive separate stages: the multipole plasma driver; the H- ion generator with a Cs-Mo converter, and the ion extraction and beam formation system. To date the plasma driver stage has been designed, and is anticipated to produce an intense plasma stream with high efficiency(low energy-per ion expenditure). The atomic processes in the second stage have been modeled, the anticipated result is a dense population of H– ions with a very low temperature. The Tandem SPS source is expected to produce DC beams of H– ions with currents up to 50 mA, and pulsed H– beams at large duty factors with currents up to 100 mA.