Abstract
A dual-source injector for tandem accelerators to produce negative ion currents of H, D, and He has been developed and built. The system consists of a central vacuum enclosure that accommodates two multicusp ion sources. Beam currents of several mA of H(-) and D(-) have been obtained by direct negative extraction of one of the multicusp ion sources. The yield for He(-) was optimized applying differentially pumped vacuum sections that support space compensation in the He(+) transport section a well as low neutralization loss of He(-) after charge exchange. In addition, an optimized extraction geometry and beam transport system enabled in excess of 10 mA He(+) within the low acceptance of the charge exchange canal. Early measurements yielded approximately 50 microA for He(-) using Li as a charge exchange medium, but currents over 100 microA are anticipated if Na would be used.
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