A moving plasma with directed flow velocitiesvlarger than the ion acoustic speedcsis used as a source of high‐current ion beams in the 10–20‐keV range of energies. Current densities up to 3 A/cm2are obtained at the plasma boundary which is an order of magnitude larger than the limiting value of Bohm current in a stationary plasma. The observed current densities were proportional tov, unlike the Bohm current densities which are proportional to ion acoustic speed. Total ion currents up to ∼100 A were extracted from the plasma through a two electrode extraction system. Simple geometric shaping of the electrodes enabled an 8‐cm‐diam beam to be focused to ∼7 mm.