Neutralization efficiency of plasma targets for high energy negative ions

Plasma targets generated by hollow cathode discharges are used to neutralize a variety of multi‐MeV negative ions as heavy as 28 a.m.u. Our plan is to determine the neutralization efficiency of hydrogen and argon plasma targets for D−, Li−, C−, O−, and Si− at beam energies of 2–8 MeV. The experiment is still in progress. Encouraging initial results are reported.