MEASUREMENT OF H-, H-0, AND H-MEV H- IONS( YIELDS PRODUCED BY FOIL STRIPPING OF 800)

Measurements of H- stripping and H-0 excited-state production for a wi de range of foil thicknesses and experimental conditions are reported. An 800-MeV H- beam was passed through carbon or aluminum oxide foils of thicknesses ranging from 10 to 550 mu g/cm(2) and the excited state s produced were analyzed by field. stripping in a special magnet downs tream of the foil. The foil thicknesses were independently determined. The H-0 atoms emerging in excited states with n>2 can be stripped to protons in fields of up to 1.3 T The yield of excited states as a func tion of foil thickness and the cross sections for the various interact ions are presented. The cross-section ratio of double to single ioniza tion of H- in carbon is found to be (1.8+/-0.9)%.