Abstract
The construction and performance of an electron bombardment ion source designed to produce a beam of low-energy (100–400 eV) singly ionized helium (He+) with a significant fraction of ions in the metastable 2S1/2 state is described. The source operates in the fringe field of a magnet and injects ions along the field lines into the center of the magnet. He+ currents of up to 70 μA with small beam energy spread (3 eV) are obtained. A typical metastable fraction is 0.08% for small He+ currents (2–5 μA).
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