We describe models for the long‐pulsed surface‐plasma multiaperture quasi steady‐state with a hydrogen negative ion output of up to 1 A, with an emission current density of 2 A/cm2, and with an average current density in a beam of 60 mA/cm2. The gas efficiency for the production of H−beams was 12–17%. The experimental and the simulated efficiencies of the negative ion production of pure hydrogen and cesiated surface‐plasma sources with geometrical focusing are compared.