Negative Oxygen Ions from a Glow Discharge Source

Abstract

A simple source of O- ions suitable for accelerator applications is described. Negative atomic ion currents of over 2 μA can be directly extracted at 10 keV energy for a low-pressure cold-cathode oxygen discharge source which incorporates an electrostatic constrictor electrode. The input power is only 25 watts and the gas consumption 14 cm3 h-1 of oxygen at atmospheric pressure.