Abstract
Abstract An ion source of original concept, named “BPD Ion Source” is described, in which the source plasma is produced by an electron beam-plasma discharge. A hydrogen ion beam of 120 mA can be continuously extracted from the plasma in the direction of the electron beam at an extraction voltage of 30 kV through a single circular aperture of 8 mm dia. located at the bottom of the discharge chamber. The current density has reached 239 mA/cm2. The hot electrons contained in the source plasma facilitate the extraction of this intense ion beam. The normalized emittance of this source was observed to be 9.4×10−7 m-rad with 100 mA beam extraction. The abundance ratio of the beam ion species and other characteristics are described and a discussion is presented on the possibility of scaling up for purposes of practical application.
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