Abstract
The production of negative ions is one of the key issues in material processing and the neutral beam generation in nuclear fusion devices. Negative ions are known to be produced by the electric charge exchange during the ion scattering on material surfaces. We measured the production of negative ions using stable oxide materials with low work functions, instead of commonly used alkali metals. Negative ions, generated from barium oxide and calcium oxide surface during He+ scattering, are successfully detected by newly established detection system by means of pulse counting with wide dynamic range.
