Abstract
A brief description of a method for producing relatively intense molecular negative ion beams for the difficult Group IIA elements is given which offers considerable improvement in terms of source operation and beam intensity stability over other methods conventionally utilized. It is particularly suited for use in cesium plasma sources such as the Aarhus geometry [1,2] and axial geometry versions of the source [3−5]. The method utilizes H 2 source feed gas for the production of a hydrogen-rich plasma discharge which sputters a negatively biased probe made of elemental or copper alloy material. Negative ion beams of MgH 3 − ⩾ 12 μA have been realized during routine operation of the 25 MV tandem accelerator [6]. Negative ion beam intensity data, typical source operational parameters, and examples of mass spectra associated with their production are given. Interesting intermetallic molecular negative ion beams consisting of the particular Group IIA element and a Cu alloy atom have also been observed.
Published Version
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