Theoretical study of H- stripping with a wiggler magnet

A speculative technique is proposed in which the beam divergence growth and resulting emittance growth are reduced by stripping the H/sup -/ in a wiggler magnet whose transverse field alternates in direction as a function of position along the beam axis. The wiggler field configuration is adjusted so that the angular beam spread introduced during passage through one unidirectional-field increment of path is relatively small and so that 99.99% of the beam is stripped after passing through the whole magnet. With careful field design, the net added angular beam spread is reduced because the incremental angular spreads are painted back and forth over the same small range. In a hypothetical case described, the calculated emittance growth and beam loss increase are significantly smaller than those calculated for a conventional stripper magnet.<>