High-current negative-ion beam transport

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Abstract
The requirements for transporting high‐current, negative‐ion beams are presented with particular emphasis on applications involving negative‐hydrogen‐ion beams. In addition to the usual matching and steering problems, particular attention must be paid to beam emittance growth in the transport system. Depending on the application, a number of approaches have been developed using both magnetic and electric lenses. I discuss the design considerations for transporting and matching these beams to radio‐frequency quadrupole accelerators, and present a survey of the various types of beamlines now used for negative‐ion beams.

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