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ABSTRACT:
The
positive and negative ion beam merging system, developed by
Ka-Ngo Leung and his colleagues at Berkeley Lab, constitutes
a technical advance over the use of either positive or negative
ion beams for such applications as ion implantation or neutral
beam injection into a fusion device. Initially, positive and
negative ions are extracted from two separate ion sources
and passed through an electromagnet with symmetrical trajectories
so that the beams merge as they leave the electromagnet. Berkeley
Lab’s beam merging system allows for a high incidence
of mutual neutralization of these positive and negative ions.
This overcomes some of the standard technical limitations
that cause beam blow up at low-energy beam transport in ion
implantation and power loss due to the large amount of unneutralized
beam in high-energy neutral beam formation.
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