Characteristics of a small multicusp H− source

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Abstract
It is shown that the H− current extracted from a magnetically filtered multicusp source can be enhanced by optimizing the extraction chamber length, by employing the proper chamber wall material, by mixing hydrogen with xenon gases in the discharge and by injecting very low energy electrons into the filter and extraction regions. A large improvement in H− yield can be achieved by using a multicusp source with a much reduced plasma volume. In this arrangement, H− current densities as high as 240 mA/cm2 have been obtained from a 1‐mm‐diam extraction aperture.

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